about summary refs log tree commit diff
path: root/tests
diff options
context:
space:
mode:
Diffstat (limited to 'tests')
-rw-r--r--tests/run-make/link-under-xcode/foo.rs1
-rw-r--r--tests/run-make/link-under-xcode/rmake.rs32
-rw-r--r--tests/rustdoc-ui/intra-doc/github-flavored-admonitions.rs6
-rw-r--r--tests/rustdoc/enum/enum-variant-value.rs22
-rw-r--r--tests/ui/attributes/crate-name-macro-call.stderr2
-rw-r--r--tests/ui/attributes/crate-type-delimited.stderr19
-rw-r--r--tests/ui/attributes/crate-type-empty.stderr15
-rw-r--r--tests/ui/attributes/crate-type-macro-call.stderr19
-rw-r--r--tests/ui/attributes/invalid-macro-use.rs4
-rw-r--r--tests/ui/attributes/invalid-macro-use.stderr26
-rw-r--r--tests/ui/attributes/invalid-reprs.stderr1
-rw-r--r--tests/ui/attributes/lint_on_root.rs2
-rw-r--r--tests/ui/attributes/lint_on_root.stderr4
-rw-r--r--tests/ui/attributes/malformed-attrs.rs2
-rw-r--r--tests/ui/attributes/malformed-attrs.stderr210
-rw-r--r--tests/ui/attributes/malformed-reprs.stderr22
-rw-r--r--tests/ui/attributes/unsafe/proc-unsafe-attributes.stderr15
-rw-r--r--tests/ui/attributes/used_with_multi_args.stderr5
-rw-r--r--tests/ui/cfg/cfg-target-compact-errors.stderr8
-rw-r--r--tests/ui/conditional-compilation/cfg-attr-syntax-validation.rs5
-rw-r--r--tests/ui/conditional-compilation/cfg-attr-syntax-validation.stderr28
-rw-r--r--tests/ui/deprecation/deprecation-sanity.stderr48
-rw-r--r--tests/ui/error-codes/E0197.stderr2
-rw-r--r--tests/ui/error-codes/E0540.stderr7
-rw-r--r--tests/ui/error-codes/E0565-1.stderr8
-rw-r--r--tests/ui/extern/issue-47725.rs1
-rw-r--r--tests/ui/extern/issue-47725.stderr2
-rw-r--r--tests/ui/feature-gates/feature-gate-optimize_attribute.stderr17
-rw-r--r--tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr4
-rw-r--r--tests/ui/invalid-compile-flags/print-crate-name-request-malformed-crate-name.stderr2
-rw-r--r--tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-1.stderr2
-rw-r--r--tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-2.stderr2
-rw-r--r--tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name.stderr2
-rw-r--r--tests/ui/invalid/invalid-inline.stderr13
-rw-r--r--tests/ui/issues/issue-43988.stderr50
-rw-r--r--tests/ui/link-native-libs/link-attr-validation-early.rs4
-rw-r--r--tests/ui/link-native-libs/link-attr-validation-early.stderr12
-rw-r--r--tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-invalid-format.stderr4
-rw-r--r--tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.rs2
-rw-r--r--tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.stderr6
-rw-r--r--tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.rs2
-rw-r--r--tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.stderr6
-rw-r--r--tests/ui/lint/dead-code/self-assign.rs17
-rw-r--r--tests/ui/lint/dead-code/self-assign.stderr44
-rw-r--r--tests/ui/lint/lint-malformed.stderr15
-rw-r--r--tests/ui/macros/macro-use-bad-args-1.stderr1
-rw-r--r--tests/ui/macros/macro-use-bad-args-2.stderr1
-rw-r--r--tests/ui/malformed/malformed-regressions.rs4
-rw-r--r--tests/ui/malformed/malformed-regressions.stderr22
-rw-r--r--tests/ui/modules/path-invalid-form.stderr2
-rw-r--r--tests/ui/modules/path-macro.stderr2
-rw-r--r--tests/ui/parser/bad-lit-suffixes.stderr1
-rw-r--r--tests/ui/parser/default-on-wrong-item-kind.rs8
-rw-r--r--tests/ui/parser/default-on-wrong-item-kind.stderr42
-rw-r--r--tests/ui/proc-macro/attribute.rs16
-rw-r--r--tests/ui/proc-macro/attribute.stderr268
-rw-r--r--tests/ui/recursion_limit/invalid_digit_type.stderr2
-rw-r--r--tests/ui/recursion_limit/invalid_macro.stderr2
-rw-r--r--tests/ui/recursion_limit/no-value.stderr2
-rw-r--r--tests/ui/repr/invalid_repr_list_help.stderr5
-rw-r--r--tests/ui/repr/repr.stderr62
-rw-r--r--tests/ui/resolve/path-attr-in-const-block.stderr2
-rw-r--r--tests/ui/span/E0539.stderr6
-rw-r--r--tests/ui/specialization/defaultimpl/validation.rs2
-rw-r--r--tests/ui/specialization/defaultimpl/validation.stderr4
-rw-r--r--tests/ui/test-attrs/test-should-panic-attr.rs4
-rw-r--r--tests/ui/test-attrs/test-should-panic-attr.stderr10
-rw-r--r--tests/ui/traits/const-traits/inherent-impl.rs4
-rw-r--r--tests/ui/traits/const-traits/inherent-impl.stderr8
-rw-r--r--tests/ui/traits/const-traits/macro-const-trait-bound-theoretical-regression.stderr26
-rw-r--r--tests/ui/traits/const-traits/span-bug-issue-121418.rs2
-rw-r--r--tests/ui/traits/const-traits/span-bug-issue-121418.stderr4
-rw-r--r--tests/ui/traits/safety-inherent-impl.stderr2
-rw-r--r--tests/ui/traits/syntax-trait-polarity.stderr20
-rw-r--r--tests/ui/unpretty/exhaustive.hir.stdout2
-rw-r--r--tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.fail.stderr18
-rw-r--r--tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.rs33
-rw-r--r--tests/ui/unstable-feature-bound/unstable_inherent_method.rs4
-rw-r--r--tests/ui/unstable-feature-bound/unstable_inherent_method.stderr8
79 files changed, 1057 insertions, 262 deletions
diff --git a/tests/run-make/link-under-xcode/foo.rs b/tests/run-make/link-under-xcode/foo.rs
new file mode 100644
index 00000000000..f328e4d9d04
--- /dev/null
+++ b/tests/run-make/link-under-xcode/foo.rs
@@ -0,0 +1 @@
+fn main() {}
diff --git a/tests/run-make/link-under-xcode/rmake.rs b/tests/run-make/link-under-xcode/rmake.rs
new file mode 100644
index 00000000000..c9394feb000
--- /dev/null
+++ b/tests/run-make/link-under-xcode/rmake.rs
@@ -0,0 +1,32 @@
+//! Test that linking works under an environment similar to what Xcode sets up.
+//!
+//! Regression test for https://github.com/rust-lang/rust/issues/80817.
+
+//@ only-apple
+
+use run_make_support::{cmd, rustc, target};
+
+fn main() {
+    // Fetch toolchain `/usr/bin` directory. Usually:
+    // /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
+    let clang_bin = cmd("xcrun").arg("--find").arg("clang").run().stdout_utf8();
+    let toolchain_bin = clang_bin.trim().strip_suffix("/clang").unwrap();
+
+    // Put toolchain directory at the front of PATH.
+    let path = format!("{}:{}", toolchain_bin, std::env::var("PATH").unwrap());
+
+    // Check that compiling and linking still works.
+    //
+    // Removing `SDKROOT` is necessary for the test to excercise what we want, since bootstrap runs
+    // under `/usr/bin/python3`, which will set SDKROOT for us.
+    rustc().target(target()).env_remove("SDKROOT").env("PATH", &path).input("foo.rs").run();
+
+    // Also check linking directly with the system linker.
+    rustc()
+        .target(target())
+        .env_remove("SDKROOT")
+        .env("PATH", &path)
+        .input("foo.rs")
+        .arg("-Clinker-flavor=ld")
+        .run();
+}
diff --git a/tests/rustdoc-ui/intra-doc/github-flavored-admonitions.rs b/tests/rustdoc-ui/intra-doc/github-flavored-admonitions.rs
new file mode 100644
index 00000000000..d5fa72eb993
--- /dev/null
+++ b/tests/rustdoc-ui/intra-doc/github-flavored-admonitions.rs
@@ -0,0 +1,6 @@
+// regression test for https://github.com/rust-lang/rust/issues/141866
+//@ check-pass
+#![deny(rustdoc::broken_intra_doc_links)]
+
+//! > [!NOTE]
+//! > This should not cause any warnings
diff --git a/tests/rustdoc/enum/enum-variant-value.rs b/tests/rustdoc/enum/enum-variant-value.rs
index 1670de8a24f..9cc85dfe10d 100644
--- a/tests/rustdoc/enum/enum-variant-value.rs
+++ b/tests/rustdoc/enum/enum-variant-value.rs
@@ -189,3 +189,25 @@ pub use bar::P;
 //@ has - '//*[@id="variant.A"]/h3' 'A(u32)'
 //@ matches - '//*[@id="variant.B"]/h3' '^B$'
 pub use bar::Q;
+
+// Ensure signed implicit discriminants are rendered correctly after a negative explicit value.
+//@ has 'foo/enum.R.html'
+//@ has - '//*[@class="rust item-decl"]/code' 'A = -2,'
+//@ has - '//*[@class="rust item-decl"]/code' 'B = -1,'
+//@ matches - '//*[@id="variant.A"]/h3' '^A = -2$'
+//@ matches - '//*[@id="variant.B"]/h3' '^B = -1$'
+pub enum R {
+    A = -2,
+    B,
+}
+
+// Also check that incrementing -1 yields 0 for the next implicit variant.
+//@ has 'foo/enum.S.html'
+//@ has - '//*[@class="rust item-decl"]/code' 'A = -1,'
+//@ has - '//*[@class="rust item-decl"]/code' 'B = 0,'
+//@ matches - '//*[@id="variant.A"]/h3' '^A = -1$'
+//@ matches - '//*[@id="variant.B"]/h3' '^B = 0$'
+pub enum S {
+    A = -1,
+    B,
+}
diff --git a/tests/ui/attributes/crate-name-macro-call.stderr b/tests/ui/attributes/crate-name-macro-call.stderr
index ab562b41a31..56827aa11a4 100644
--- a/tests/ui/attributes/crate-name-macro-call.stderr
+++ b/tests/ui/attributes/crate-name-macro-call.stderr
@@ -3,6 +3,8 @@ error: malformed `crate_name` attribute input
    |
 LL | #![crate_name = concat!("my", "crate")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![crate_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/crates-and-source-files.html#the-crate_name-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/attributes/crate-type-delimited.stderr b/tests/ui/attributes/crate-type-delimited.stderr
index 0bbbe07b198..7f080f74838 100644
--- a/tests/ui/attributes/crate-type-delimited.stderr
+++ b/tests/ui/attributes/crate-type-delimited.stderr
@@ -2,7 +2,24 @@ error: malformed `crate_type` attribute input
   --> $DIR/crate-type-delimited.rs:2:1
    |
 LL | #![crate_type(lib)]
-   | ^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![crate_type = "bin|lib|..."]`
+   | ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/linkage.html>
+help: the following are the possible correct uses
+   |
+LL - #![crate_type(lib)]
+LL + #![crate_type = "bin"]
+   |
+LL - #![crate_type(lib)]
+LL + #![crate_type = "cdylib"]
+   |
+LL - #![crate_type(lib)]
+LL + #![crate_type = "dylib"]
+   |
+LL - #![crate_type(lib)]
+LL + #![crate_type = "lib"]
+   |
+   = and 4 other candidates
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/attributes/crate-type-empty.stderr b/tests/ui/attributes/crate-type-empty.stderr
index b9279d961ee..f50bb33d6bb 100644
--- a/tests/ui/attributes/crate-type-empty.stderr
+++ b/tests/ui/attributes/crate-type-empty.stderr
@@ -2,7 +2,20 @@ error: malformed `crate_type` attribute input
   --> $DIR/crate-type-empty.rs:2:1
    |
 LL | #![crate_type]
-   | ^^^^^^^^^^^^^^ help: must be of the form: `#![crate_type = "bin|lib|..."]`
+   | ^^^^^^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/linkage.html>
+help: the following are the possible correct uses
+   |
+LL | #![crate_type = "bin"]
+   |               +++++++
+LL | #![crate_type = "cdylib"]
+   |               ++++++++++
+LL | #![crate_type = "dylib"]
+   |               +++++++++
+LL | #![crate_type = "lib"]
+   |               +++++++
+   = and 4 other candidates
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/attributes/crate-type-macro-call.stderr b/tests/ui/attributes/crate-type-macro-call.stderr
index 6ccc3edf885..97938f7af24 100644
--- a/tests/ui/attributes/crate-type-macro-call.stderr
+++ b/tests/ui/attributes/crate-type-macro-call.stderr
@@ -2,7 +2,24 @@ error: malformed `crate_type` attribute input
   --> $DIR/crate-type-macro-call.rs:1:1
    |
 LL | #![crate_type = foo!()]
-   | ^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![crate_type = "bin|lib|..."]`
+   | ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/linkage.html>
+help: the following are the possible correct uses
+   |
+LL - #![crate_type = foo!()]
+LL + #![crate_type = "bin"]
+   |
+LL - #![crate_type = foo!()]
+LL + #![crate_type = "cdylib"]
+   |
+LL - #![crate_type = foo!()]
+LL + #![crate_type = "dylib"]
+   |
+LL - #![crate_type = foo!()]
+LL + #![crate_type = "lib"]
+   |
+   = and 4 other candidates
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/attributes/invalid-macro-use.rs b/tests/ui/attributes/invalid-macro-use.rs
index cfb13fd183c..52e4608303f 100644
--- a/tests/ui/attributes/invalid-macro-use.rs
+++ b/tests/ui/attributes/invalid-macro-use.rs
@@ -8,21 +8,25 @@ extern crate std as s1;
 #[macro_use(5)]
 //~^ ERROR malformed `macro_use` attribute input
 //~| NOTE expected a valid identifier here
+//~| NOTE for more information, visit
 extern crate std as s2;
 
 #[macro_use(a = "b")]
 //~^ ERROR malformed `macro_use` attribute input
 //~| NOTE didn't expect any arguments here
+//~| NOTE for more information, visit
 extern crate std as s3;
 
 #[macro_use(a(b))]
 //~^ ERROR malformed `macro_use` attribute input
 //~| NOTE didn't expect any arguments here
+//~| NOTE for more information, visit
 extern crate std as s4;
 
 #[macro_use(a::b)]
 //~^ ERROR malformed `macro_use` attribute input
 //~| NOTE expected a valid identifier here
+//~| NOTE for more information, visit
 extern crate std as s5;
 
 #[macro_use(a)]
diff --git a/tests/ui/attributes/invalid-macro-use.stderr b/tests/ui/attributes/invalid-macro-use.stderr
index 4f5db5c558a..ff3ed6196d3 100644
--- a/tests/ui/attributes/invalid-macro-use.stderr
+++ b/tests/ui/attributes/invalid-macro-use.stderr
@@ -1,11 +1,11 @@
 error[E0469]: imported macro not found
-  --> $DIR/invalid-macro-use.rs:47:13
+  --> $DIR/invalid-macro-use.rs:51:13
    |
 LL | #[macro_use(a)]
    |             ^
 
 error[E0469]: imported macro not found
-  --> $DIR/invalid-macro-use.rs:49:13
+  --> $DIR/invalid-macro-use.rs:53:13
    |
 LL | #[macro_use(b)]
    |             ^
@@ -24,6 +24,7 @@ LL | #[macro_use(5)]
    |             |
    |             expected a valid identifier here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/macros-by-example.html#the-macro_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[macro_use(5)]
@@ -34,13 +35,14 @@ LL + #[macro_use]
    |
 
 error[E0565]: malformed `macro_use` attribute input
-  --> $DIR/invalid-macro-use.rs:13:1
+  --> $DIR/invalid-macro-use.rs:14:1
    |
 LL | #[macro_use(a = "b")]
    | ^^^^^^^^^^^^^^-----^^
    |               |
    |               didn't expect any arguments here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/macros-by-example.html#the-macro_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[macro_use(a = "b")]
@@ -51,13 +53,14 @@ LL + #[macro_use]
    |
 
 error[E0565]: malformed `macro_use` attribute input
-  --> $DIR/invalid-macro-use.rs:18:1
+  --> $DIR/invalid-macro-use.rs:20:1
    |
 LL | #[macro_use(a(b))]
    | ^^^^^^^^^^^^^---^^
    |              |
    |              didn't expect any arguments here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/macros-by-example.html#the-macro_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[macro_use(a(b))]
@@ -68,13 +71,14 @@ LL + #[macro_use]
    |
 
 error[E0539]: malformed `macro_use` attribute input
-  --> $DIR/invalid-macro-use.rs:23:1
+  --> $DIR/invalid-macro-use.rs:26:1
    |
 LL | #[macro_use(a::b)]
    | ^^^^^^^^^^^^----^^
    |             |
    |             expected a valid identifier here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/macros-by-example.html#the-macro_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[macro_use(a::b)]
@@ -85,13 +89,13 @@ LL + #[macro_use]
    |
 
 error: unused attribute
-  --> $DIR/invalid-macro-use.rs:28:1
+  --> $DIR/invalid-macro-use.rs:32:1
    |
 LL | #[macro_use(a)]
    | ^^^^^^^^^^^^^^^ help: remove this attribute
    |
 note: attribute also specified here
-  --> $DIR/invalid-macro-use.rs:30:1
+  --> $DIR/invalid-macro-use.rs:34:1
    |
 LL | #[macro_use]
    | ^^^^^^^^^^^^
@@ -102,25 +106,25 @@ LL | #![deny(unused_attributes)]
    |         ^^^^^^^^^^^^^^^^^
 
 error: unused attribute
-  --> $DIR/invalid-macro-use.rs:36:1
+  --> $DIR/invalid-macro-use.rs:40:1
    |
 LL | #[macro_use(a)]
    | ^^^^^^^^^^^^^^^ help: remove this attribute
    |
 note: attribute also specified here
-  --> $DIR/invalid-macro-use.rs:34:1
+  --> $DIR/invalid-macro-use.rs:38:1
    |
 LL | #[macro_use]
    | ^^^^^^^^^^^^
 
 error: unused attribute
-  --> $DIR/invalid-macro-use.rs:42:1
+  --> $DIR/invalid-macro-use.rs:46:1
    |
 LL | #[macro_use]
    | ^^^^^^^^^^^^ help: remove this attribute
    |
 note: attribute also specified here
-  --> $DIR/invalid-macro-use.rs:40:1
+  --> $DIR/invalid-macro-use.rs:44:1
    |
 LL | #[macro_use]
    | ^^^^^^^^^^^^
diff --git a/tests/ui/attributes/invalid-reprs.stderr b/tests/ui/attributes/invalid-reprs.stderr
index 415b969b244..72aaff92bd0 100644
--- a/tests/ui/attributes/invalid-reprs.stderr
+++ b/tests/ui/attributes/invalid-reprs.stderr
@@ -26,6 +26,7 @@ LL |     let y = #[repr(uwu(4))]
    |                    ^^^^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/attributes/lint_on_root.rs b/tests/ui/attributes/lint_on_root.rs
index 93d47bf0d71..9029da7dc97 100644
--- a/tests/ui/attributes/lint_on_root.rs
+++ b/tests/ui/attributes/lint_on_root.rs
@@ -1,7 +1,7 @@
 // NOTE: this used to panic in debug builds (by a sanity assertion)
 // and not emit any lint on release builds. See https://github.com/rust-lang/rust/issues/142891.
 #![inline = ""]
-//~^ ERROR valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+//~^ ERROR: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]` [ill_formed_attribute_input]
 //~| WARN this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 
 fn main() {}
diff --git a/tests/ui/attributes/lint_on_root.stderr b/tests/ui/attributes/lint_on_root.stderr
index aa0645b6194..91b72730530 100644
--- a/tests/ui/attributes/lint_on_root.stderr
+++ b/tests/ui/attributes/lint_on_root.stderr
@@ -1,4 +1,4 @@
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/lint_on_root.rs:3:1
    |
 LL | #![inline = ""]
@@ -11,7 +11,7 @@ LL | #![inline = ""]
 error: aborting due to 1 previous error
 
 Future incompatibility report: Future breakage diagnostic:
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/lint_on_root.rs:3:1
    |
 LL | #![inline = ""]
diff --git a/tests/ui/attributes/malformed-attrs.rs b/tests/ui/attributes/malformed-attrs.rs
index 0d5bf69d548..3261b29fe7e 100644
--- a/tests/ui/attributes/malformed-attrs.rs
+++ b/tests/ui/attributes/malformed-attrs.rs
@@ -78,7 +78,7 @@
 #[export_stable = 1]
 //~^ ERROR malformed
 #[link]
-//~^ ERROR attribute must be of the form
+//~^ ERROR valid forms for the attribute are
 //~| WARN this was previously accepted by the compiler
 #[link_name]
 //~^ ERROR malformed
diff --git a/tests/ui/attributes/malformed-attrs.stderr b/tests/ui/attributes/malformed-attrs.stderr
index dd9dd3a6ce7..705050e9a7d 100644
--- a/tests/ui/attributes/malformed-attrs.stderr
+++ b/tests/ui/attributes/malformed-attrs.stderr
@@ -6,6 +6,8 @@ LL | #[cfg]
    | |
    | expected this to be a list
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error: malformed `cfg_attr` attribute input
   --> $DIR/malformed-attrs.rs:101:1
@@ -29,13 +31,23 @@ error: malformed `windows_subsystem` attribute input
   --> $DIR/malformed-attrs.rs:26:1
    |
 LL | #![windows_subsystem]
-   | ^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![windows_subsystem = "windows|console"]`
+   | ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/runtime.html#the-windows_subsystem-attribute>
+help: the following are the possible correct uses
+   |
+LL | #![windows_subsystem = "console"]
+   |                      +++++++++++
+LL | #![windows_subsystem = "windows"]
+   |                      +++++++++++
 
 error: malformed `crate_name` attribute input
   --> $DIR/malformed-attrs.rs:71:1
    |
 LL | #[crate_name]
    | ^^^^^^^^^^^^^ help: must be of the form: `#[crate_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/crates-and-source-files.html#the-crate_name-attribute>
 
 error: malformed `no_sanitize` attribute input
   --> $DIR/malformed-attrs.rs:89:1
@@ -48,6 +60,8 @@ error: malformed `instruction_set` attribute input
    |
 LL | #[instruction_set]
    | ^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[instruction_set(set)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-instruction_set-attribute>
 
 error: malformed `patchable_function_entry` attribute input
   --> $DIR/malformed-attrs.rs:105:1
@@ -80,43 +94,108 @@ error: malformed `linkage` attribute input
   --> $DIR/malformed-attrs.rs:170:5
    |
 LL |     #[linkage]
-   |     ^^^^^^^^^^ help: must be of the form: `#[linkage = "external|internal|..."]`
+   |     ^^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/linkage.html>
+help: the following are the possible correct uses
+   |
+LL |     #[linkage = "available_externally"]
+   |               ++++++++++++++++++++++++
+LL |     #[linkage = "common"]
+   |               ++++++++++
+LL |     #[linkage = "extern_weak"]
+   |               +++++++++++++++
+LL |     #[linkage = "external"]
+   |               ++++++++++++
+   = and 5 other candidates
 
 error: malformed `allow` attribute input
   --> $DIR/malformed-attrs.rs:175:1
    |
 LL | #[allow]
-   | ^^^^^^^^ help: must be of the form: `#[allow(lint1, lint2, ..., /*opt*/ reason = "...")]`
+   | ^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes>
+help: the following are the possible correct uses
+   |
+LL | #[allow(lint1)]
+   |        +++++++
+LL | #[allow(lint1, lint2, ...)]
+   |        +++++++++++++++++++
+LL | #[allow(lint1, lint2, lint3, reason = "...")]
+   |        +++++++++++++++++++++++++++++++++++++
 
 error: malformed `expect` attribute input
   --> $DIR/malformed-attrs.rs:177:1
    |
 LL | #[expect]
-   | ^^^^^^^^^ help: must be of the form: `#[expect(lint1, lint2, ..., /*opt*/ reason = "...")]`
+   | ^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes>
+help: the following are the possible correct uses
+   |
+LL | #[expect(lint1)]
+   |         +++++++
+LL | #[expect(lint1, lint2, ...)]
+   |         +++++++++++++++++++
+LL | #[expect(lint1, lint2, lint3, reason = "...")]
+   |         +++++++++++++++++++++++++++++++++++++
 
 error: malformed `warn` attribute input
   --> $DIR/malformed-attrs.rs:179:1
    |
 LL | #[warn]
-   | ^^^^^^^ help: must be of the form: `#[warn(lint1, lint2, ..., /*opt*/ reason = "...")]`
+   | ^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes>
+help: the following are the possible correct uses
+   |
+LL | #[warn(lint1)]
+   |       +++++++
+LL | #[warn(lint1, lint2, ...)]
+   |       +++++++++++++++++++
+LL | #[warn(lint1, lint2, lint3, reason = "...")]
+   |       +++++++++++++++++++++++++++++++++++++
 
 error: malformed `deny` attribute input
   --> $DIR/malformed-attrs.rs:181:1
    |
 LL | #[deny]
-   | ^^^^^^^ help: must be of the form: `#[deny(lint1, lint2, ..., /*opt*/ reason = "...")]`
+   | ^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes>
+help: the following are the possible correct uses
+   |
+LL | #[deny(lint1)]
+   |       +++++++
+LL | #[deny(lint1, lint2, ...)]
+   |       +++++++++++++++++++
+LL | #[deny(lint1, lint2, lint3, reason = "...")]
+   |       +++++++++++++++++++++++++++++++++++++
 
 error: malformed `forbid` attribute input
   --> $DIR/malformed-attrs.rs:183:1
    |
 LL | #[forbid]
-   | ^^^^^^^^^ help: must be of the form: `#[forbid(lint1, lint2, ..., /*opt*/ reason = "...")]`
+   | ^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes>
+help: the following are the possible correct uses
+   |
+LL | #[forbid(lint1)]
+   |         +++++++
+LL | #[forbid(lint1, lint2, ...)]
+   |         +++++++++++++++++++
+LL | #[forbid(lint1, lint2, lint3, reason = "...")]
+   |         +++++++++++++++++++++++++++++++++++++
 
 error: malformed `debugger_visualizer` attribute input
   --> $DIR/malformed-attrs.rs:185:1
    |
 LL | #[debugger_visualizer]
    | ^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[debugger_visualizer(natvis_file = "...", gdb_script_file = "...")]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/debugger.html#the-debugger_visualizer-attribute>
 
 error: malformed `thread_local` attribute input
   --> $DIR/malformed-attrs.rs:200:1
@@ -129,6 +208,8 @@ error: malformed `no_link` attribute input
    |
 LL | #[no_link()]
    | ^^^^^^^^^^^^ help: must be of the form: `#[no_link]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/extern-crates.html#the-no_link-attribute>
 
 error: malformed `macro_export` attribute input
   --> $DIR/malformed-attrs.rs:211:1
@@ -136,6 +217,7 @@ error: malformed `macro_export` attribute input
 LL | #[macro_export = 18]
    | ^^^^^^^^^^^^^^^^^^^^
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/macros-by-example.html#path-based-scope>
 help: the following are the possible correct uses
    |
 LL - #[macro_export = 18]
@@ -145,12 +227,6 @@ LL - #[macro_export = 18]
 LL + #[macro_export]
    |
 
-error: malformed `allow_internal_unsafe` attribute input
-  --> $DIR/malformed-attrs.rs:213:1
-   |
-LL | #[allow_internal_unsafe = 1]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[allow_internal_unsafe]`
-
 error: the `#[proc_macro]` attribute is only usable with crates of the `proc-macro` crate type
   --> $DIR/malformed-attrs.rs:96:1
    |
@@ -178,7 +254,7 @@ LL | #[allow_internal_unsafe = 1]
    = help: add `#![feature(allow_internal_unsafe)]` to the crate attributes to enable
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
-error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+error: valid forms for the attribute are `#[doc(hidden)]`, `#[doc(inline)]`, and `#[doc = "string"]`
   --> $DIR/malformed-attrs.rs:40:1
    |
 LL | #[doc]
@@ -186,9 +262,10 @@ LL | #[doc]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
-error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+error: valid forms for the attribute are `#[doc(hidden)]`, `#[doc(inline)]`, and `#[doc = "string"]`
   --> $DIR/malformed-attrs.rs:73:1
    |
 LL | #[doc]
@@ -196,8 +273,9 @@ LL | #[doc]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html>
 
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/malformed-attrs.rs:80:1
    |
 LL | #[link]
@@ -205,6 +283,7 @@ LL | #[link]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
 
 error: invalid argument
   --> $DIR/malformed-attrs.rs:185:1
@@ -257,26 +336,49 @@ LL - #[deprecated = 5]
 LL + #[deprecated = "reason"]
    |
 LL - #[deprecated = 5]
-LL + #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL + #[deprecated(note = "reason")]
    |
 LL - #[deprecated = 5]
-LL + #[deprecated]
+LL + #[deprecated(since = "version")]
    |
+LL - #[deprecated = 5]
+LL + #[deprecated(since = "version", note = "reason")]
+   |
+   = and 1 other candidate
 
 error[E0539]: malformed `rustc_macro_transparency` attribute input
   --> $DIR/malformed-attrs.rs:43:1
    |
 LL | #[rustc_macro_transparency]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_macro_transparency = "transparent|semitransparent|opaque"]`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL | #[rustc_macro_transparency = "opaque"]
+   |                            ++++++++++
+LL | #[rustc_macro_transparency = "semitransparent"]
+   |                            +++++++++++++++++++
+LL | #[rustc_macro_transparency = "transparent"]
+   |                            +++++++++++++++
 
 error[E0539]: malformed `repr` attribute input
   --> $DIR/malformed-attrs.rs:45:1
    |
 LL | #[repr]
-   | ^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+   | ^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html#representations>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL | #[repr(<integer type>)]
+   |       ++++++++++++++++
+LL | #[repr(C)]
+   |       +++
+LL | #[repr(Rust)]
+   |       ++++++
+LL | #[repr(align(...))]
+   |       ++++++++++++
+   = and 2 other candidates
 
 error[E0565]: malformed `rustc_as_ptr` attribute input
   --> $DIR/malformed-attrs.rs:48:1
@@ -300,10 +402,16 @@ error[E0539]: malformed `optimize` attribute input
   --> $DIR/malformed-attrs.rs:55:1
    |
 LL | #[optimize]
-   | ^^^^^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[optimize(size|speed|none)]`
+   | ^^^^^^^^^^^ expected this to be a list
+   |
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL | #[optimize(none)]
+   |           ++++++
+LL | #[optimize(size)]
+   |           ++++++
+LL | #[optimize(speed)]
+   |           +++++++
 
 error[E0565]: malformed `cold` attribute input
   --> $DIR/malformed-attrs.rs:57:1
@@ -363,8 +471,10 @@ LL | #[used()]
    |
 help: try changing it to one of the following valid forms of the attribute
    |
-LL | #[used(compiler|linker)]
-   |        +++++++++++++++
+LL | #[used(compiler)]
+   |        ++++++++
+LL | #[used(linker)]
+   |        ++++++
 LL - #[used()]
 LL + #[used]
    |
@@ -392,12 +502,16 @@ error[E0539]: malformed `link_name` attribute input
    |
 LL | #[link_name]
    | ^^^^^^^^^^^^ help: must be of the form: `#[link_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_name-attribute>
 
 error[E0539]: malformed `link_section` attribute input
   --> $DIR/malformed-attrs.rs:85:1
    |
 LL | #[link_section]
    | ^^^^^^^^^^^^^^^ help: must be of the form: `#[link_section = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/abi.html#the-link_section-attribute>
 
 error[E0539]: malformed `coverage` attribute input
   --> $DIR/malformed-attrs.rs:87:1
@@ -456,6 +570,7 @@ LL | #[must_use = 1]
    |              |
    |              expected a string literal here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#the-must_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[must_use = 1]
@@ -469,10 +584,15 @@ error[E0539]: malformed `proc_macro_derive` attribute input
   --> $DIR/malformed-attrs.rs:120:1
    |
 LL | #[proc_macro_derive]
-   | ^^^^^^^^^^^^^^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   | ^^^^^^^^^^^^^^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL | #[proc_macro_derive(TraitName)]
+   |                    +++++++++++
+LL | #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |                    ++++++++++++++++++++++++++++++++++++++++++
 
 error[E0539]: malformed `rustc_layout_scalar_valid_range_start` attribute input
   --> $DIR/malformed-attrs.rs:125:1
@@ -527,6 +647,8 @@ LL |     #[link_ordinal]
    |     |
    |     expected this to be a list
    |     help: must be of the form: `#[link_ordinal(ordinal)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute>
 
 error[E0565]: malformed `ffi_const` attribute input
   --> $DIR/malformed-attrs.rs:168:5
@@ -561,6 +683,15 @@ error: valid forms for the attribute are `#[macro_use(name1, name2, ...)]` and `
 LL | #[macro_use = 1]
    | ^^^^^^^^^^^^^^^^
 
+error[E0565]: malformed `allow_internal_unsafe` attribute input
+  --> $DIR/malformed-attrs.rs:213:1
+   |
+LL | #[allow_internal_unsafe = 1]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^---^
+   | |                       |
+   | |                       didn't expect any arguments here
+   | help: must be of the form: `#[allow_internal_unsafe]`
+
 error[E0565]: malformed `type_const` attribute input
   --> $DIR/malformed-attrs.rs:140:5
    |
@@ -618,7 +749,7 @@ LL | #[diagnostic::on_unimplemented = 1]
    |
    = help: only `message`, `note` and `label` are allowed as options
 
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/malformed-attrs.rs:50:1
    |
 LL | #[inline = 5]
@@ -661,7 +792,7 @@ error: aborting due to 74 previous errors; 3 warnings emitted
 Some errors have detailed explanations: E0308, E0463, E0539, E0565, E0658, E0805.
 For more information about an error, try `rustc --explain E0308`.
 Future incompatibility report: Future breakage diagnostic:
-error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+error: valid forms for the attribute are `#[doc(hidden)]`, `#[doc(inline)]`, and `#[doc = "string"]`
   --> $DIR/malformed-attrs.rs:40:1
    |
 LL | #[doc]
@@ -669,10 +800,11 @@ LL | #[doc]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
-error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+error: valid forms for the attribute are `#[doc(hidden)]`, `#[doc(inline)]`, and `#[doc = "string"]`
   --> $DIR/malformed-attrs.rs:73:1
    |
 LL | #[doc]
@@ -680,10 +812,11 @@ LL | #[doc]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/malformed-attrs.rs:80:1
    |
 LL | #[link]
@@ -691,10 +824,11 @@ LL | #[link]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/malformed-attrs.rs:50:1
    |
 LL | #[inline = 5]
diff --git a/tests/ui/attributes/malformed-reprs.stderr b/tests/ui/attributes/malformed-reprs.stderr
index c39c98dde31..43085b9c341 100644
--- a/tests/ui/attributes/malformed-reprs.stderr
+++ b/tests/ui/attributes/malformed-reprs.stderr
@@ -2,10 +2,24 @@ error[E0539]: malformed `repr` attribute input
   --> $DIR/malformed-reprs.rs:4:1
    |
 LL | #![repr]
-   | ^^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+   | ^^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html#representations>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #![repr]
+LL + #[repr(<integer type>)]
+   |
+LL - #![repr]
+LL + #[repr(C)]
+   |
+LL - #![repr]
+LL + #[repr(Rust)]
+   |
+LL - #![repr]
+LL + #[repr(align(...))]
+   |
+   = and 2 other candidates
 
 error[E0589]: invalid `repr(align)` attribute: not a power of two
   --> $DIR/malformed-reprs.rs:9:14
diff --git a/tests/ui/attributes/unsafe/proc-unsafe-attributes.stderr b/tests/ui/attributes/unsafe/proc-unsafe-attributes.stderr
index 884e7663c85..107e053ae0c 100644
--- a/tests/ui/attributes/unsafe/proc-unsafe-attributes.stderr
+++ b/tests/ui/attributes/unsafe/proc-unsafe-attributes.stderr
@@ -119,9 +119,18 @@ error[E0565]: malformed `proc_macro_derive` attribute input
    |
 LL | #[proc_macro_derive(unsafe(Foo))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^-----^^
-   | |                         |
-   | |                         didn't expect any arguments here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                           |
+   |                           didn't expect any arguments here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(unsafe(Foo))]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(unsafe(Foo))]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0452]: malformed lint attribute input
   --> $DIR/proc-unsafe-attributes.rs:27:16
diff --git a/tests/ui/attributes/used_with_multi_args.stderr b/tests/ui/attributes/used_with_multi_args.stderr
index e48209cf204..308f0519b8c 100644
--- a/tests/ui/attributes/used_with_multi_args.stderr
+++ b/tests/ui/attributes/used_with_multi_args.stderr
@@ -9,7 +9,10 @@ LL | #[used(compiler, linker)]
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[used(compiler, linker)]
-LL + #[used(compiler|linker)]
+LL + #[used(compiler)]
+   |
+LL - #[used(compiler, linker)]
+LL + #[used(linker)]
    |
 LL - #[used(compiler, linker)]
 LL + #[used]
diff --git a/tests/ui/cfg/cfg-target-compact-errors.stderr b/tests/ui/cfg/cfg-target-compact-errors.stderr
index 7df6729e881..cf61f94278a 100644
--- a/tests/ui/cfg/cfg-target-compact-errors.stderr
+++ b/tests/ui/cfg/cfg-target-compact-errors.stderr
@@ -6,6 +6,8 @@ LL | #[cfg(target(o::o))]
    | |            |
    | |            expected this to be of the form `... = "..."`
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error[E0539]: malformed `cfg` attribute input
   --> $DIR/cfg-target-compact-errors.rs:9:1
@@ -15,6 +17,8 @@ LL | #[cfg(target(os = 8))]
    | |                 |
    | |                 expected a string literal here
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error[E0539]: malformed `cfg` attribute input
   --> $DIR/cfg-target-compact-errors.rs:13:1
@@ -24,6 +28,8 @@ LL | #[cfg(target(os = "linux", pointer(width = "64")))]
    | |                          |
    | |                          expected this to be of the form `... = "..."`
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error[E0539]: malformed `cfg` attribute input
   --> $DIR/cfg-target-compact-errors.rs:17:1
@@ -33,6 +39,8 @@ LL | #[cfg(target(true))]
    | |            |
    | |            expected this to be of the form `... = "..."`
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error: `cfg` predicate key must be an identifier
   --> $DIR/cfg-target-compact-errors.rs:21:14
diff --git a/tests/ui/conditional-compilation/cfg-attr-syntax-validation.rs b/tests/ui/conditional-compilation/cfg-attr-syntax-validation.rs
index df87a3d846e..126a534dc6f 100644
--- a/tests/ui/conditional-compilation/cfg-attr-syntax-validation.rs
+++ b/tests/ui/conditional-compilation/cfg-attr-syntax-validation.rs
@@ -1,21 +1,25 @@
 #[cfg]
 //~^ ERROR malformed `cfg` attribute
 //~| NOTE expected this to be a list
+//~| NOTE for more information, visit
 struct S1;
 
 #[cfg = 10]
 //~^ ERROR malformed `cfg` attribute
 //~| NOTE expected this to be a list
+//~| NOTE for more information, visit
 struct S2;
 
 #[cfg()]
 //~^ ERROR malformed `cfg` attribute
 //~| NOTE expected a single argument here
+//~| NOTE for more information, visit
 struct S3;
 
 #[cfg(a, b)]
 //~^ ERROR malformed `cfg` attribute
 //~| NOTE expected a single argument here
+//~| NOTE for more information, visit
 struct S4;
 
 #[cfg("str")] //~ ERROR `cfg` predicate key must be an identifier
@@ -29,6 +33,7 @@ struct S7;
 
 #[cfg(a = 10)] //~ ERROR malformed `cfg` attribute input
 //~^ NOTE expected a string literal here
+//~| NOTE for more information, visit
 struct S8;
 
 #[cfg(a = b"hi")]  //~ ERROR malformed `cfg` attribute input
diff --git a/tests/ui/conditional-compilation/cfg-attr-syntax-validation.stderr b/tests/ui/conditional-compilation/cfg-attr-syntax-validation.stderr
index 75e9b9209c0..6acde758ea5 100644
--- a/tests/ui/conditional-compilation/cfg-attr-syntax-validation.stderr
+++ b/tests/ui/conditional-compilation/cfg-attr-syntax-validation.stderr
@@ -6,63 +6,73 @@ LL | #[cfg]
    | |
    | expected this to be a list
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error[E0539]: malformed `cfg` attribute input
-  --> $DIR/cfg-attr-syntax-validation.rs:6:1
+  --> $DIR/cfg-attr-syntax-validation.rs:7:1
    |
 LL | #[cfg = 10]
    | ^^^^^^^^^^^
    | |
    | expected this to be a list
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error[E0805]: malformed `cfg` attribute input
-  --> $DIR/cfg-attr-syntax-validation.rs:11:1
+  --> $DIR/cfg-attr-syntax-validation.rs:13:1
    |
 LL | #[cfg()]
    | ^^^^^--^
    | |    |
    | |    expected a single argument here
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error[E0805]: malformed `cfg` attribute input
-  --> $DIR/cfg-attr-syntax-validation.rs:16:1
+  --> $DIR/cfg-attr-syntax-validation.rs:19:1
    |
 LL | #[cfg(a, b)]
    | ^^^^^------^
    | |    |
    | |    expected a single argument here
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error: `cfg` predicate key must be an identifier
-  --> $DIR/cfg-attr-syntax-validation.rs:21:7
+  --> $DIR/cfg-attr-syntax-validation.rs:25:7
    |
 LL | #[cfg("str")]
    |       ^^^^^
 
 error: `cfg` predicate key must be an identifier
-  --> $DIR/cfg-attr-syntax-validation.rs:24:7
+  --> $DIR/cfg-attr-syntax-validation.rs:28:7
    |
 LL | #[cfg(a::b)]
    |       ^^^^
 
 error[E0537]: invalid predicate `a`
-  --> $DIR/cfg-attr-syntax-validation.rs:27:7
+  --> $DIR/cfg-attr-syntax-validation.rs:31:7
    |
 LL | #[cfg(a())]
    |       ^^^
 
 error[E0539]: malformed `cfg` attribute input
-  --> $DIR/cfg-attr-syntax-validation.rs:30:1
+  --> $DIR/cfg-attr-syntax-validation.rs:34:1
    |
 LL | #[cfg(a = 10)]
    | ^^^^^^^^^^--^^
    | |         |
    | |         expected a string literal here
    | help: must be of the form: `#[cfg(predicate)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute>
 
 error[E0539]: malformed `cfg` attribute input
-  --> $DIR/cfg-attr-syntax-validation.rs:34:1
+  --> $DIR/cfg-attr-syntax-validation.rs:39:1
    |
 LL | #[cfg(a = b"hi")]
    | ^^^^^^^^^^-^^^^^^
@@ -72,7 +82,7 @@ LL | #[cfg(a = b"hi")]
    = note: expected a normal string literal, not a byte string literal
 
 error: expected unsuffixed literal, found `expr` metavariable
-  --> $DIR/cfg-attr-syntax-validation.rs:40:25
+  --> $DIR/cfg-attr-syntax-validation.rs:45:25
    |
 LL |         #[cfg(feature = $expr)]
    |                         ^^^^^
diff --git a/tests/ui/deprecation/deprecation-sanity.stderr b/tests/ui/deprecation/deprecation-sanity.stderr
index f1b4697485c..856f51a4b24 100644
--- a/tests/ui/deprecation/deprecation-sanity.stderr
+++ b/tests/ui/deprecation/deprecation-sanity.stderr
@@ -18,11 +18,15 @@ LL -     #[deprecated(since = "a", note)]
 LL +     #[deprecated = "reason"]
    |
 LL -     #[deprecated(since = "a", note)]
-LL +     #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL +     #[deprecated(note = "reason")]
    |
 LL -     #[deprecated(since = "a", note)]
-LL +     #[deprecated]
+LL +     #[deprecated(since = "version")]
    |
+LL -     #[deprecated(since = "a", note)]
+LL +     #[deprecated(since = "version", note = "reason")]
+   |
+   = and 1 other candidate
 
 error[E0539]: malformed `deprecated` attribute input
   --> $DIR/deprecation-sanity.rs:10:5
@@ -38,11 +42,15 @@ LL -     #[deprecated(since, note = "a")]
 LL +     #[deprecated = "reason"]
    |
 LL -     #[deprecated(since, note = "a")]
-LL +     #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL +     #[deprecated(note = "reason")]
+   |
+LL -     #[deprecated(since, note = "a")]
+LL +     #[deprecated(since = "version")]
    |
 LL -     #[deprecated(since, note = "a")]
-LL +     #[deprecated]
+LL +     #[deprecated(since = "version", note = "reason")]
    |
+   = and 1 other candidate
 
 error[E0539]: malformed `deprecated` attribute input
   --> $DIR/deprecation-sanity.rs:13:5
@@ -58,11 +66,15 @@ LL -     #[deprecated(since = "a", note(b))]
 LL +     #[deprecated = "reason"]
    |
 LL -     #[deprecated(since = "a", note(b))]
-LL +     #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL +     #[deprecated(note = "reason")]
+   |
+LL -     #[deprecated(since = "a", note(b))]
+LL +     #[deprecated(since = "version")]
    |
 LL -     #[deprecated(since = "a", note(b))]
-LL +     #[deprecated]
+LL +     #[deprecated(since = "version", note = "reason")]
    |
+   = and 1 other candidate
 
 error[E0539]: malformed `deprecated` attribute input
   --> $DIR/deprecation-sanity.rs:16:5
@@ -78,11 +90,15 @@ LL -     #[deprecated(since(b), note = "a")]
 LL +     #[deprecated = "reason"]
    |
 LL -     #[deprecated(since(b), note = "a")]
-LL +     #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL +     #[deprecated(note = "reason")]
    |
 LL -     #[deprecated(since(b), note = "a")]
-LL +     #[deprecated]
+LL +     #[deprecated(since = "version")]
    |
+LL -     #[deprecated(since(b), note = "a")]
+LL +     #[deprecated(since = "version", note = "reason")]
+   |
+   = and 1 other candidate
 
 error[E0539]: malformed `deprecated` attribute input
   --> $DIR/deprecation-sanity.rs:19:5
@@ -108,11 +124,15 @@ LL -     #[deprecated("test")]
 LL +     #[deprecated = "reason"]
    |
 LL -     #[deprecated("test")]
-LL +     #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL +     #[deprecated(note = "reason")]
+   |
+LL -     #[deprecated("test")]
+LL +     #[deprecated(since = "version")]
    |
 LL -     #[deprecated("test")]
-LL +     #[deprecated]
+LL +     #[deprecated(since = "version", note = "reason")]
    |
+   = and 1 other candidate
 
 error: multiple `deprecated` attributes
   --> $DIR/deprecation-sanity.rs:27:1
@@ -140,11 +160,15 @@ LL - #[deprecated(since = "a", since = "b", note = "c")]
 LL + #[deprecated = "reason"]
    |
 LL - #[deprecated(since = "a", since = "b", note = "c")]
-LL + #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL + #[deprecated(note = "reason")]
+   |
+LL - #[deprecated(since = "a", since = "b", note = "c")]
+LL + #[deprecated(since = "version")]
    |
 LL - #[deprecated(since = "a", since = "b", note = "c")]
-LL + #[deprecated]
+LL + #[deprecated(since = "version", note = "reason")]
    |
+   = and 1 other candidate
 
 error: this `#[deprecated]` annotation has no effect
   --> $DIR/deprecation-sanity.rs:35:1
diff --git a/tests/ui/error-codes/E0197.stderr b/tests/ui/error-codes/E0197.stderr
index c06777396e8..04c6174b9f1 100644
--- a/tests/ui/error-codes/E0197.stderr
+++ b/tests/ui/error-codes/E0197.stderr
@@ -5,6 +5,8 @@ LL | unsafe impl Foo { }
    | ------      ^^^ inherent impl for this type
    | |
    | unsafe because of this
+   |
+   = note: only trait implementations may be annotated with `unsafe`
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/error-codes/E0540.stderr b/tests/ui/error-codes/E0540.stderr
index 3e5f408feb5..ae23dce5c50 100644
--- a/tests/ui/error-codes/E0540.stderr
+++ b/tests/ui/error-codes/E0540.stderr
@@ -6,10 +6,13 @@ LL | #[inline()]
    |         |
    |         expected a single argument here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
-LL | #[inline(always|never)]
-   |          ++++++++++++
+LL | #[inline(always)]
+   |          ++++++
+LL | #[inline(never)]
+   |          +++++
 LL - #[inline()]
 LL + #[inline]
    |
diff --git a/tests/ui/error-codes/E0565-1.stderr b/tests/ui/error-codes/E0565-1.stderr
index 6277e6400d7..52daf2a62fc 100644
--- a/tests/ui/error-codes/E0565-1.stderr
+++ b/tests/ui/error-codes/E0565-1.stderr
@@ -12,11 +12,15 @@ LL - #[deprecated("since")]
 LL + #[deprecated = "reason"]
    |
 LL - #[deprecated("since")]
-LL + #[deprecated(/*opt*/ since = "version", /*opt*/ note = "reason")]
+LL + #[deprecated(note = "reason")]
    |
 LL - #[deprecated("since")]
-LL + #[deprecated]
+LL + #[deprecated(since = "version")]
    |
+LL - #[deprecated("since")]
+LL + #[deprecated(since = "version", note = "reason")]
+   |
+   = and 1 other candidate
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/extern/issue-47725.rs b/tests/ui/extern/issue-47725.rs
index 60d0cd62347..8ac866dc7d9 100644
--- a/tests/ui/extern/issue-47725.rs
+++ b/tests/ui/extern/issue-47725.rs
@@ -17,6 +17,7 @@ extern "C" {
 #[link_name]
 //~^ ERROR malformed `link_name` attribute input
 //~| HELP must be of the form
+//~| NOTE for more information, visit
 extern "C" {
     fn bar() -> u32;
 }
diff --git a/tests/ui/extern/issue-47725.stderr b/tests/ui/extern/issue-47725.stderr
index 4fd02a1778b..c5af54b8029 100644
--- a/tests/ui/extern/issue-47725.stderr
+++ b/tests/ui/extern/issue-47725.stderr
@@ -3,6 +3,8 @@ error[E0539]: malformed `link_name` attribute input
    |
 LL | #[link_name]
    | ^^^^^^^^^^^^ help: must be of the form: `#[link_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_name-attribute>
 
 warning: attribute should be applied to a foreign function or static
   --> $DIR/issue-47725.rs:3:1
diff --git a/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr b/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr
index e7e62b4f989..646abf8e4a1 100644
--- a/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr
+++ b/tests/ui/feature-gates/feature-gate-optimize_attribute.stderr
@@ -43,9 +43,20 @@ error[E0539]: malformed `optimize` attribute input
    |
 LL | #[optimize(banana)]
    | ^^^^^^^^^^^------^^
-   | |          |
-   | |          valid arguments are `size`, `speed` or `none`
-   | help: must be of the form: `#[optimize(size|speed|none)]`
+   |            |
+   |            valid arguments are `size`, `speed` or `none`
+   |
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[optimize(banana)]
+LL + #[optimize(none)]
+   |
+LL - #[optimize(banana)]
+LL + #[optimize(size)]
+   |
+LL - #[optimize(banana)]
+LL + #[optimize(speed)]
+   |
 
 error: aborting due to 5 previous errors
 
diff --git a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr
index 324f7e9fd8a..7550e26f4a7 100644
--- a/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr
+++ b/tests/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.stderr
@@ -304,7 +304,7 @@ error[E0517]: attribute should be applied to a struct, enum, or union
 LL |     #[repr(Rust)] impl S { }
    |            ^^^^   ---------- not a struct, enum, or union
 
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:46:5
    |
 LL |     #[inline = "2100"] fn f() { }
@@ -319,7 +319,7 @@ error: aborting due to 38 previous errors
 Some errors have detailed explanations: E0517, E0518, E0658.
 For more information about an error, try `rustc --explain E0517`.
 Future incompatibility report: Future breakage diagnostic:
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/issue-43106-gating-of-builtin-attrs-error.rs:46:5
    |
 LL |     #[inline = "2100"] fn f() { }
diff --git a/tests/ui/invalid-compile-flags/print-crate-name-request-malformed-crate-name.stderr b/tests/ui/invalid-compile-flags/print-crate-name-request-malformed-crate-name.stderr
index 6bf09a2b131..b773f7c97aa 100644
--- a/tests/ui/invalid-compile-flags/print-crate-name-request-malformed-crate-name.stderr
+++ b/tests/ui/invalid-compile-flags/print-crate-name-request-malformed-crate-name.stderr
@@ -3,6 +3,8 @@ error: malformed `crate_name` attribute input
    |
 LL | #![crate_name = concat!("wrapped")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![crate_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/crates-and-source-files.html#the-crate_name-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-1.stderr b/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-1.stderr
index de62aed79fc..64e38ed8533 100644
--- a/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-1.stderr
+++ b/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-1.stderr
@@ -3,6 +3,8 @@ error: malformed `crate_name` attribute input
    |
 LL | #![crate_name]
    | ^^^^^^^^^^^^^^ help: must be of the form: `#![crate_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/crates-and-source-files.html#the-crate_name-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-2.stderr b/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-2.stderr
index 42c33de1221..e9a5b58e4f9 100644
--- a/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-2.stderr
+++ b/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name-2.stderr
@@ -3,6 +3,8 @@ error: malformed `crate_name` attribute input
    |
 LL | #![crate_name = concat!("this_one_is_not")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![crate_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/crates-and-source-files.html#the-crate_name-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name.stderr b/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name.stderr
index cb5ffaab9ca..e63525c6a5d 100644
--- a/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name.stderr
+++ b/tests/ui/invalid-compile-flags/print-file-names-request-malformed-crate-name.stderr
@@ -3,6 +3,8 @@ error: malformed `crate_name` attribute input
    |
 LL | #![crate_name = concat!("wrapped")]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![crate_name = "name"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/crates-and-source-files.html#the-crate_name-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/invalid/invalid-inline.stderr b/tests/ui/invalid/invalid-inline.stderr
index 54e6b2b5408..78ffe3270a7 100644
--- a/tests/ui/invalid/invalid-inline.stderr
+++ b/tests/ui/invalid/invalid-inline.stderr
@@ -6,10 +6,14 @@ LL | #[inline(please,no)]
    |         |
    |         expected a single argument here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[inline(please,no)]
-LL + #[inline(always|never)]
+LL + #[inline(always)]
+   |
+LL - #[inline(please,no)]
+LL + #[inline(never)]
    |
 LL - #[inline(please,no)]
 LL + #[inline]
@@ -23,10 +27,13 @@ LL | #[inline()]
    |         |
    |         expected a single argument here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
-LL | #[inline(always|never)]
-   |          ++++++++++++
+LL | #[inline(always)]
+   |          ++++++
+LL | #[inline(never)]
+   |          +++++
 LL - #[inline()]
 LL + #[inline]
    |
diff --git a/tests/ui/issues/issue-43988.stderr b/tests/ui/issues/issue-43988.stderr
index fe61e136a51..b50d691e685 100644
--- a/tests/ui/issues/issue-43988.stderr
+++ b/tests/ui/issues/issue-43988.stderr
@@ -6,10 +6,14 @@ LL |     #[inline(XYZ)]
    |              |
    |              valid arguments are `always` or `never`
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL -     #[inline(XYZ)]
-LL +     #[inline(always|never)]
+LL +     #[inline(always)]
+   |
+LL -     #[inline(XYZ)]
+LL +     #[inline(never)]
    |
 LL -     #[inline(XYZ)]
 LL +     #[inline]
@@ -22,6 +26,7 @@ LL |     #[repr(nothing)]
    |            ^^^^^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error[E0552]: unrecognized representation hint
   --> $DIR/issue-43988.rs:18:12
@@ -30,15 +35,26 @@ LL |     #[repr(something_not_real)]
    |            ^^^^^^^^^^^^^^^^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error[E0539]: malformed `repr` attribute input
   --> $DIR/issue-43988.rs:24:5
    |
 LL |     #[repr]
-   |     ^^^^^^^
-   |     |
-   |     expected this to be a list
-   |     help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+   |     ^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html#representations>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL |     #[repr(<integer type>)]
+   |           ++++++++++++++++
+LL |     #[repr(C)]
+   |           +++
+LL |     #[repr(Rust)]
+   |           ++++++
+LL |     #[repr(align(...))]
+   |           ++++++++++++
+   = and 2 other candidates
 
 error[E0539]: malformed `inline` attribute input
   --> $DIR/issue-43988.rs:30:5
@@ -48,10 +64,14 @@ LL |     #[inline(ABC)]
    |              |
    |              valid arguments are `always` or `never`
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL -     #[inline(ABC)]
-LL +     #[inline(always|never)]
+LL +     #[inline(always)]
+   |
+LL -     #[inline(ABC)]
+LL +     #[inline(never)]
    |
 LL -     #[inline(ABC)]
 LL +     #[inline]
@@ -61,10 +81,20 @@ error[E0539]: malformed `repr` attribute input
   --> $DIR/issue-43988.rs:34:14
    |
 LL |     let _z = #[repr] 1;
-   |              ^^^^^^^
-   |              |
-   |              expected this to be a list
-   |              help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+   |              ^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html#representations>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL |     let _z = #[repr(<integer type>)] 1;
+   |                    ++++++++++++++++
+LL |     let _z = #[repr(C)] 1;
+   |                    +++
+LL |     let _z = #[repr(Rust)] 1;
+   |                    ++++++
+LL |     let _z = #[repr(align(...))] 1;
+   |                    ++++++++++++
+   = and 2 other candidates
 
 error[E0518]: attribute should be applied to function or closure
   --> $DIR/issue-43988.rs:5:5
diff --git a/tests/ui/link-native-libs/link-attr-validation-early.rs b/tests/ui/link-native-libs/link-attr-validation-early.rs
index b9a835fb5e9..a7dd80f8920 100644
--- a/tests/ui/link-native-libs/link-attr-validation-early.rs
+++ b/tests/ui/link-native-libs/link-attr-validation-early.rs
@@ -1,7 +1,7 @@
 // Top-level ill-formed
-#[link] //~ ERROR attribute must be of the form
+#[link] //~ ERROR valid forms for the attribute are
         //~| WARN this was previously accepted
-#[link = "foo"] //~ ERROR attribute must be of the form
+#[link = "foo"] //~ ERROR valid forms for the attribute are
                 //~| WARN this was previously accepted
 extern "C" {}
 
diff --git a/tests/ui/link-native-libs/link-attr-validation-early.stderr b/tests/ui/link-native-libs/link-attr-validation-early.stderr
index c69899275d5..36cca6f27ef 100644
--- a/tests/ui/link-native-libs/link-attr-validation-early.stderr
+++ b/tests/ui/link-native-libs/link-attr-validation-early.stderr
@@ -1,4 +1,4 @@
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/link-attr-validation-early.rs:2:1
    |
 LL | #[link]
@@ -6,9 +6,10 @@ LL | #[link]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/link-attr-validation-early.rs:4:1
    |
 LL | #[link = "foo"]
@@ -16,11 +17,12 @@ LL | #[link = "foo"]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
 
 error: aborting due to 2 previous errors
 
 Future incompatibility report: Future breakage diagnostic:
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/link-attr-validation-early.rs:2:1
    |
 LL | #[link]
@@ -28,10 +30,11 @@ LL | #[link]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/link-attr-validation-early.rs:4:1
    |
 LL | #[link = "foo"]
@@ -39,5 +42,6 @@ LL | #[link = "foo"]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
diff --git a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-invalid-format.stderr b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-invalid-format.stderr
index ffae30aabcc..6bf1eab311a 100644
--- a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-invalid-format.stderr
+++ b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-invalid-format.stderr
@@ -6,6 +6,8 @@ LL |     #[link_ordinal("JustMonika")]
    |     |              |
    |     |              expected an integer literal here
    |     help: must be of the form: `#[link_ordinal(ordinal)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute>
 
 error[E0539]: malformed `link_ordinal` attribute input
   --> $DIR/link-ordinal-invalid-format.rs:6:5
@@ -15,6 +17,8 @@ LL |     #[link_ordinal("JustMonika")]
    |     |              |
    |     |              expected an integer literal here
    |     help: must be of the form: `#[link_ordinal(ordinal)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute>
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.rs b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.rs
index 2a8b9ebacf7..58f19085540 100644
--- a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.rs
+++ b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.rs
@@ -3,10 +3,12 @@ extern "C" {
     #[link_ordinal()]
     //~^ ERROR malformed `link_ordinal` attribute input
     //~| NOTE  expected a single argument
+    //~| NOTE for more information, visit
     fn foo();
     #[link_ordinal()]
     //~^ ERROR malformed `link_ordinal` attribute input
     //~| NOTE  expected a single argument
+    //~| NOTE for more information, visit
     static mut imported_variable: i32;
 }
 
diff --git a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.stderr b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.stderr
index c6b8a18d03a..d575b0961af 100644
--- a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.stderr
+++ b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-missing-argument.stderr
@@ -6,15 +6,19 @@ LL |     #[link_ordinal()]
    |     |             |
    |     |             expected a single argument here
    |     help: must be of the form: `#[link_ordinal(ordinal)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute>
 
 error[E0805]: malformed `link_ordinal` attribute input
-  --> $DIR/link-ordinal-missing-argument.rs:7:5
+  --> $DIR/link-ordinal-missing-argument.rs:8:5
    |
 LL |     #[link_ordinal()]
    |     ^^^^^^^^^^^^^^--^
    |     |             |
    |     |             expected a single argument here
    |     help: must be of the form: `#[link_ordinal(ordinal)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute>
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.rs b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.rs
index ddf9583352f..55b18ae0d96 100644
--- a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.rs
+++ b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.rs
@@ -3,10 +3,12 @@ extern "C" {
     #[link_ordinal(3, 4)]
     //~^ ERROR malformed `link_ordinal` attribute input
     //~| NOTE  expected a single argument
+    //~| NOTE for more information, visit
     fn foo();
     #[link_ordinal(3, 4)]
     //~^ ERROR malformed `link_ordinal` attribute input
     //~| NOTE  expected a single argument
+    //~| NOTE for more information, visit
     static mut imported_variable: i32;
 }
 
diff --git a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.stderr b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.stderr
index 7d63304f598..a84fef9f9e4 100644
--- a/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.stderr
+++ b/tests/ui/linkage-attr/raw-dylib/windows/link-ordinal-too-many-arguments.stderr
@@ -6,15 +6,19 @@ LL |     #[link_ordinal(3, 4)]
    |     |             |
    |     |             expected a single argument here
    |     help: must be of the form: `#[link_ordinal(ordinal)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute>
 
 error[E0805]: malformed `link_ordinal` attribute input
-  --> $DIR/link-ordinal-too-many-arguments.rs:7:5
+  --> $DIR/link-ordinal-too-many-arguments.rs:8:5
    |
 LL |     #[link_ordinal(3, 4)]
    |     ^^^^^^^^^^^^^^------^
    |     |             |
    |     |             expected a single argument here
    |     help: must be of the form: `#[link_ordinal(ordinal)]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute>
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/lint/dead-code/self-assign.rs b/tests/ui/lint/dead-code/self-assign.rs
index 357846baf22..ce91f53cbf1 100644
--- a/tests/ui/lint/dead-code/self-assign.rs
+++ b/tests/ui/lint/dead-code/self-assign.rs
@@ -7,23 +7,20 @@
 //! - `dead_code` lint expansion for self-assignments was implemented in #87129.
 //! - Unfortunately implementation components of #87129 had to be disabled as part of reverts
 //!   #86212, #83171 (to revert #81473) to address regressions #81626 and #81658.
-//! - Consequently, none of the following warnings are emitted.
+//! - Re-enabled in current version to properly detect self-assignments.
 
 //@ check-pass
 
-// Implementation of self-assignment `dead_code` lint expansions disabled due to reverts.
-//@ known-bug: #75356
-
 #![allow(unused_assignments)]
 #![warn(dead_code)]
 
 fn main() {
     let mut x = 0;
     x = x;
-    // FIXME ~^ WARNING: useless assignment of variable of type `i32` to itself
+    //~^ WARNING: useless assignment of variable of type `i32` to itself
 
     x = (x);
-    // FIXME ~^ WARNING: useless assignment of variable of type `i32` to itself
+    //~^ WARNING: useless assignment of variable of type `i32` to itself
 
     x = {x};
     // block expressions don't count as self-assignments
@@ -32,10 +29,10 @@ fn main() {
     struct S<'a> { f: &'a str }
     let mut s = S { f: "abc" };
     s = s;
-    // FIXME ~^ WARNING: useless assignment of variable of type `S` to itself
+    //~^ WARNING: useless assignment of variable of type `S<'_>` to itself
 
     s.f = s.f;
-    // FIXME ~^ WARNING: useless assignment of field of type `&str` to itself
+    //~^ WARNING: useless assignment of field of type `&str` to itself
 
 
     struct N0 { x: Box<i32> }
@@ -44,11 +41,11 @@ fn main() {
     struct N3 { n: N2 };
     let mut n3 = N3 { n: N2(N1 { n: N0 { x: Box::new(42) } }) };
     n3.n.0.n.x = n3.n.0.n.x;
-    // FIXME ~^ WARNING: useless assignment of field of type `Box<i32>` to itself
+    //~^ WARNING: useless assignment of field of type `Box<i32>` to itself
 
     let mut t = (1, ((2, 3, (4, 5)),));
     t.1.0.2.1 = t.1.0.2.1;
-    // FIXME ~^ WARNING: useless assignment of field of type `i32` to itself
+    //~^ WARNING: useless assignment of field of type `i32` to itself
 
 
     let mut y = 0;
diff --git a/tests/ui/lint/dead-code/self-assign.stderr b/tests/ui/lint/dead-code/self-assign.stderr
new file mode 100644
index 00000000000..408ebdb658b
--- /dev/null
+++ b/tests/ui/lint/dead-code/self-assign.stderr
@@ -0,0 +1,44 @@
+warning: useless assignment of variable of type `i32` to itself
+  --> $DIR/self-assign.rs:19:5
+   |
+LL |     x = x;
+   |     ^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/self-assign.rs:15:9
+   |
+LL | #![warn(dead_code)]
+   |         ^^^^^^^^^
+
+warning: useless assignment of variable of type `i32` to itself
+  --> $DIR/self-assign.rs:22:5
+   |
+LL |     x = (x);
+   |     ^^^^^^^
+
+warning: useless assignment of variable of type `S<'_>` to itself
+  --> $DIR/self-assign.rs:31:5
+   |
+LL |     s = s;
+   |     ^^^^^
+
+warning: useless assignment of field of type `&str` to itself
+  --> $DIR/self-assign.rs:34:5
+   |
+LL |     s.f = s.f;
+   |     ^^^^^^^^^
+
+warning: useless assignment of field of type `Box<i32>` to itself
+  --> $DIR/self-assign.rs:43:5
+   |
+LL |     n3.n.0.n.x = n3.n.0.n.x;
+   |     ^^^^^^^^^^^^^^^^^^^^^^^
+
+warning: useless assignment of field of type `i32` to itself
+  --> $DIR/self-assign.rs:47:5
+   |
+LL |     t.1.0.2.1 = t.1.0.2.1;
+   |     ^^^^^^^^^^^^^^^^^^^^^
+
+warning: 6 warnings emitted
+
diff --git a/tests/ui/lint/lint-malformed.stderr b/tests/ui/lint/lint-malformed.stderr
index 0bdcc293b65..25a4298bd75 100644
--- a/tests/ui/lint/lint-malformed.stderr
+++ b/tests/ui/lint/lint-malformed.stderr
@@ -16,7 +16,20 @@ error: malformed `deny` attribute input
   --> $DIR/lint-malformed.rs:1:1
    |
 LL | #![deny = "foo"]
-   | ^^^^^^^^^^^^^^^^ help: must be of the form: `#![deny(lint1, lint2, ..., /*opt*/ reason = "...")]`
+   | ^^^^^^^^^^^^^^^^
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes>
+help: the following are the possible correct uses
+   |
+LL - #![deny = "foo"]
+LL + #![deny(lint1)]
+   |
+LL - #![deny = "foo"]
+LL + #![deny(lint1, lint2, ...)]
+   |
+LL - #![deny = "foo"]
+LL + #![deny(lint1, lint2, lint3, reason = "...")]
+   |
 
 error[E0452]: malformed lint attribute input
   --> $DIR/lint-malformed.rs:2:10
diff --git a/tests/ui/macros/macro-use-bad-args-1.stderr b/tests/ui/macros/macro-use-bad-args-1.stderr
index 2f43d0997df..542b4ae2b7a 100644
--- a/tests/ui/macros/macro-use-bad-args-1.stderr
+++ b/tests/ui/macros/macro-use-bad-args-1.stderr
@@ -6,6 +6,7 @@ LL | #[macro_use(foo(bar))]
    |                |
    |                didn't expect any arguments here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/macros-by-example.html#the-macro_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[macro_use(foo(bar))]
diff --git a/tests/ui/macros/macro-use-bad-args-2.stderr b/tests/ui/macros/macro-use-bad-args-2.stderr
index d7b03c93588..2db9ffe50b0 100644
--- a/tests/ui/macros/macro-use-bad-args-2.stderr
+++ b/tests/ui/macros/macro-use-bad-args-2.stderr
@@ -6,6 +6,7 @@ LL | #[macro_use(foo="bar")]
    |                |
    |                didn't expect any arguments here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/macros-by-example.html#the-macro_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[macro_use(foo="bar")]
diff --git a/tests/ui/malformed/malformed-regressions.rs b/tests/ui/malformed/malformed-regressions.rs
index f0a7aac59c1..99f0fc904a9 100644
--- a/tests/ui/malformed/malformed-regressions.rs
+++ b/tests/ui/malformed/malformed-regressions.rs
@@ -4,9 +4,9 @@
 //~^ WARN this was previously accepted
 #[inline = ""] //~ ERROR valid forms for the attribute are
 //~^ WARN this was previously accepted
-#[link] //~ ERROR attribute must be of the form
+#[link] //~ ERROR valid forms for the attribute are
 //~^ WARN this was previously accepted
-#[link = ""] //~ ERROR attribute must be of the form
+#[link = ""] //~ ERROR valid forms for the attribute are
 //~^ WARN this was previously accepted
 
 fn main() {}
diff --git a/tests/ui/malformed/malformed-regressions.stderr b/tests/ui/malformed/malformed-regressions.stderr
index 60ea5da761d..4a00c9b4a7d 100644
--- a/tests/ui/malformed/malformed-regressions.stderr
+++ b/tests/ui/malformed/malformed-regressions.stderr
@@ -1,4 +1,4 @@
-error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+error: valid forms for the attribute are `#[doc(hidden)]`, `#[doc(inline)]`, and `#[doc = "string"]`
   --> $DIR/malformed-regressions.rs:1:1
    |
 LL | #[doc]
@@ -6,9 +6,10 @@ LL | #[doc]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/malformed-regressions.rs:7:1
    |
 LL | #[link]
@@ -16,8 +17,9 @@ LL | #[link]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
 
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/malformed-regressions.rs:9:1
    |
 LL | #[link = ""]
@@ -25,6 +27,7 @@ LL | #[link = ""]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
 
 error: valid forms for the attribute are `#[ignore = "reason"]` and `#[ignore]`
   --> $DIR/malformed-regressions.rs:3:1
@@ -35,7 +38,7 @@ LL | #[ignore()]
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
 
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/malformed-regressions.rs:5:1
    |
 LL | #[inline = ""]
@@ -47,7 +50,7 @@ LL | #[inline = ""]
 error: aborting due to 5 previous errors
 
 Future incompatibility report: Future breakage diagnostic:
-error: valid forms for the attribute are `#[doc(hidden|inline|...)]` and `#[doc = "string"]`
+error: valid forms for the attribute are `#[doc(hidden)]`, `#[doc(inline)]`, and `#[doc = "string"]`
   --> $DIR/malformed-regressions.rs:1:1
    |
 LL | #[doc]
@@ -55,10 +58,11 @@ LL | #[doc]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/malformed-regressions.rs:7:1
    |
 LL | #[link]
@@ -66,10 +70,11 @@ LL | #[link]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
-error: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ wasm_import_module = "...", /*opt*/ import_name_type = "decorated|noprefix|undecorated")]`
+error: valid forms for the attribute are `#[link(name = "...")]`, `#[link(name = "...", kind = "dylib|static|...")]`, `#[link(name = "...", wasm_import_module = "...")]`, `#[link(name = "...", import_name_type = "decorated|noprefix|undecorated")]`, and `#[link(name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated")]`
   --> $DIR/malformed-regressions.rs:9:1
    |
 LL | #[link = ""]
@@ -77,6 +82,7 @@ LL | #[link = ""]
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute>
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
@@ -91,7 +97,7 @@ LL | #[ignore()]
    = note: `#[deny(ill_formed_attribute_input)]` on by default
 
 Future breakage diagnostic:
-error: valid forms for the attribute are `#[inline(always|never)]` and `#[inline]`
+error: valid forms for the attribute are `#[inline(always)]`, `#[inline(never)]`, and `#[inline]`
   --> $DIR/malformed-regressions.rs:5:1
    |
 LL | #[inline = ""]
diff --git a/tests/ui/modules/path-invalid-form.stderr b/tests/ui/modules/path-invalid-form.stderr
index e8ded1343f7..4e9a62fa7a9 100644
--- a/tests/ui/modules/path-invalid-form.stderr
+++ b/tests/ui/modules/path-invalid-form.stderr
@@ -3,6 +3,8 @@ error: malformed `path` attribute input
    |
 LL | #[path = 123]
    | ^^^^^^^^^^^^^ help: must be of the form: `#[path = "file"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/modules.html#the-path-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/modules/path-macro.stderr b/tests/ui/modules/path-macro.stderr
index eb02c721edd..fd93871f3a6 100644
--- a/tests/ui/modules/path-macro.stderr
+++ b/tests/ui/modules/path-macro.stderr
@@ -3,6 +3,8 @@ error: malformed `path` attribute input
    |
 LL | #[path = foo!()]
    | ^^^^^^^^^^^^^^^^ help: must be of the form: `#[path = "file"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/modules.html#the-path-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/parser/bad-lit-suffixes.stderr b/tests/ui/parser/bad-lit-suffixes.stderr
index 7876d75c5a4..9a51cf70960 100644
--- a/tests/ui/parser/bad-lit-suffixes.stderr
+++ b/tests/ui/parser/bad-lit-suffixes.stderr
@@ -158,6 +158,7 @@ LL | #[must_use = "string"suffix]
    |              |
    |              expected a string literal here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/diagnostics.html#the-must_use-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[must_use = "string"suffix]
diff --git a/tests/ui/parser/default-on-wrong-item-kind.rs b/tests/ui/parser/default-on-wrong-item-kind.rs
index da990a4b421..9de85640565 100644
--- a/tests/ui/parser/default-on-wrong-item-kind.rs
+++ b/tests/ui/parser/default-on-wrong-item-kind.rs
@@ -19,7 +19,7 @@ mod free_items {
     default union foo {} //~ ERROR a union cannot be `default`
     default trait foo {} //~ ERROR a trait cannot be `default`
     default trait foo = Ord; //~ ERROR a trait alias cannot be `default`
-    default impl foo {}
+    default impl foo {} //~ ERROR inherent impls cannot be default
     default!();
     default::foo::bar!();
     default default!(); //~ ERROR an item macro invocation cannot be `default`
@@ -53,7 +53,7 @@ extern "C" {
     //~^ ERROR trait is not supported in `extern` blocks
     default trait foo = Ord; //~ ERROR a trait alias cannot be `default`
     //~^ ERROR trait alias is not supported in `extern` blocks
-    default impl foo {}
+    default impl foo {} //~ ERROR inherent impls cannot be default
     //~^ ERROR implementation is not supported in `extern` blocks
     default!();
     default::foo::bar!();
@@ -90,7 +90,7 @@ impl S {
     //~^ ERROR trait is not supported in `trait`s or `impl`s
     default trait foo = Ord; //~ ERROR a trait alias cannot be `default`
     //~^ ERROR trait alias is not supported in `trait`s or `impl`s
-    default impl foo {}
+    default impl foo {} //~ ERROR inherent impls cannot be default
     //~^ ERROR implementation is not supported in `trait`s or `impl`s
     default!();
     default::foo::bar!();
@@ -127,7 +127,7 @@ trait T {
     //~^ ERROR trait is not supported in `trait`s or `impl`s
     default trait foo = Ord; //~ ERROR a trait alias cannot be `default`
     //~^ ERROR trait alias is not supported in `trait`s or `impl`s
-    default impl foo {}
+    default impl foo {} //~ ERROR inherent impls cannot be default
     //~^ ERROR implementation is not supported in `trait`s or `impl`s
     default!();
     default::foo::bar!();
diff --git a/tests/ui/parser/default-on-wrong-item-kind.stderr b/tests/ui/parser/default-on-wrong-item-kind.stderr
index 56641565b16..0380fcdf775 100644
--- a/tests/ui/parser/default-on-wrong-item-kind.stderr
+++ b/tests/ui/parser/default-on-wrong-item-kind.stderr
@@ -78,6 +78,16 @@ LL |     default trait foo = Ord;
    |
    = note: only associated `fn`, `const`, and `type` items can be `default`
 
+error: inherent impls cannot be default
+  --> $DIR/default-on-wrong-item-kind.rs:22:18
+   |
+LL |     default impl foo {}
+   |     -------      ^^^ inherent impl for this type
+   |     |
+   |     default because of this
+   |
+   = note: only trait implementations may be annotated with `default`
+
 error: an item macro invocation cannot be `default`
   --> $DIR/default-on-wrong-item-kind.rs:25:5
    |
@@ -275,6 +285,16 @@ LL |     default trait foo = Ord;
    |
    = help: consider moving the trait alias out to a nearby module scope
 
+error: inherent impls cannot be default
+  --> $DIR/default-on-wrong-item-kind.rs:56:18
+   |
+LL |     default impl foo {}
+   |     -------      ^^^ inherent impl for this type
+   |     |
+   |     default because of this
+   |
+   = note: only trait implementations may be annotated with `default`
+
 error: implementation is not supported in `extern` blocks
   --> $DIR/default-on-wrong-item-kind.rs:56:5
    |
@@ -489,6 +509,16 @@ LL |     default trait foo = Ord;
    |
    = help: consider moving the trait alias out to a nearby module scope
 
+error: inherent impls cannot be default
+  --> $DIR/default-on-wrong-item-kind.rs:93:18
+   |
+LL |     default impl foo {}
+   |     -------      ^^^ inherent impl for this type
+   |     |
+   |     default because of this
+   |
+   = note: only trait implementations may be annotated with `default`
+
 error: implementation is not supported in `trait`s or `impl`s
   --> $DIR/default-on-wrong-item-kind.rs:93:5
    |
@@ -703,6 +733,16 @@ LL |     default trait foo = Ord;
    |
    = help: consider moving the trait alias out to a nearby module scope
 
+error: inherent impls cannot be default
+  --> $DIR/default-on-wrong-item-kind.rs:130:18
+   |
+LL |     default impl foo {}
+   |     -------      ^^^ inherent impl for this type
+   |     |
+   |     default because of this
+   |
+   = note: only trait implementations may be annotated with `default`
+
 error: implementation is not supported in `trait`s or `impl`s
   --> $DIR/default-on-wrong-item-kind.rs:130:5
    |
@@ -759,5 +799,5 @@ LL |     default macro_rules! foo {}
    |
    = help: consider moving the macro definition out to a nearby module scope
 
-error: aborting due to 95 previous errors
+error: aborting due to 99 previous errors
 
diff --git a/tests/ui/proc-macro/attribute.rs b/tests/ui/proc-macro/attribute.rs
index 988cdcd0403..dfb26738377 100644
--- a/tests/ui/proc-macro/attribute.rs
+++ b/tests/ui/proc-macro/attribute.rs
@@ -9,46 +9,55 @@ use proc_macro::*;
 #[proc_macro_derive]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected this to be a list
+//~| NOTE for more information, visit
 pub fn foo1(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive = ""]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected this to be a list
+//~| NOTE for more information, visit
 pub fn foo2(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d3, a, b)]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE the only valid argument here is `attributes`
+//~| NOTE for more information, visit
 pub fn foo3(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d4, attributes(a), b)]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE didn't expect any arguments here
+//~| NOTE for more information, visit
 pub fn foo4(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive("a")]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE didn't expect a literal here
+//~| NOTE for more information, visit
 pub fn foo5(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d6 = "")]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE didn't expect any arguments here
+//~| NOTE for more information, visit
 pub fn foo6(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(m::d7)]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected a valid identifier here
+//~| NOTE for more information, visit
 pub fn foo7(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d8(a))]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE didn't expect any arguments here
+//~| NOTE for more information, visit
 pub fn foo8(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(self)]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected a valid identifier here
+//~| NOTE for more information, visit
 pub fn foo9(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(PartialEq)] // OK
@@ -57,34 +66,41 @@ pub fn foo10(input: TokenStream) -> TokenStream { input }
 #[proc_macro_derive(d11, a)]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE the only valid argument here is `attributes`
+//~| NOTE for more information, visit
 pub fn foo11(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d12, attributes)]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected this to be a list
+//~| NOTE for more information, visit
 pub fn foo12(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d13, attributes("a"))]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected a valid identifier here
+//~| NOTE for more information, visit
 pub fn foo13(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d14, attributes(a = ""))]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE didn't expect any arguments here
+//~| NOTE for more information, visit
 pub fn foo14(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d15, attributes(m::a))]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected a valid identifier here
+//~| NOTE for more information, visit
 pub fn foo15(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d16, attributes(a(b)))]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE didn't expect any arguments here
+//~| NOTE for more information, visit
 pub fn foo16(input: TokenStream) -> TokenStream { input }
 
 #[proc_macro_derive(d17, attributes(self))]
 //~^ ERROR malformed `proc_macro_derive` attribute
 //~| NOTE expected a valid identifier here
+//~| NOTE for more information, visit
 pub fn foo17(input: TokenStream) -> TokenStream { input }
diff --git a/tests/ui/proc-macro/attribute.stderr b/tests/ui/proc-macro/attribute.stderr
index db59a1fdfb3..e7127c8ef1d 100644
--- a/tests/ui/proc-macro/attribute.stderr
+++ b/tests/ui/proc-macro/attribute.stderr
@@ -2,145 +2,283 @@ error[E0539]: malformed `proc_macro_derive` attribute input
   --> $DIR/attribute.rs:9:1
    |
 LL | #[proc_macro_derive]
-   | ^^^^^^^^^^^^^^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   | ^^^^^^^^^^^^^^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL | #[proc_macro_derive(TraitName)]
+   |                    +++++++++++
+LL | #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |                    ++++++++++++++++++++++++++++++++++++++++++
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:14:1
+  --> $DIR/attribute.rs:15:1
    |
 LL | #[proc_macro_derive = ""]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive = ""]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive = ""]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:19:1
+  --> $DIR/attribute.rs:21:1
    |
 LL | #[proc_macro_derive(d3, a, b)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^-^^^^^
-   | |                       |
-   | |                       the only valid argument here is `attributes`
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                         |
+   |                         the only valid argument here is `attributes`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d3, a, b)]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d3, a, b)]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0565]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:24:1
+  --> $DIR/attribute.rs:27:1
    |
 LL | #[proc_macro_derive(d4, attributes(a), b)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-^^
-   | |                                      |
-   | |                                      didn't expect any arguments here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                                        |
+   |                                        didn't expect any arguments here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d4, attributes(a), b)]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d4, attributes(a), b)]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0565]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:29:1
+  --> $DIR/attribute.rs:33:1
    |
 LL | #[proc_macro_derive("a")]
    | ^^^^^^^^^^^^^^^^^^^^---^^
-   | |                   |
-   | |                   didn't expect a literal here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                     |
+   |                     didn't expect a literal here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive("a")]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive("a")]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0565]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:34:1
+  --> $DIR/attribute.rs:39:1
    |
 LL | #[proc_macro_derive(d6 = "")]
    | ^^^^^^^^^^^^^^^^^^^^^^^----^^
-   | |                      |
-   | |                      didn't expect any arguments here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                        |
+   |                        didn't expect any arguments here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d6 = "")]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d6 = "")]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:39:1
+  --> $DIR/attribute.rs:45:1
    |
 LL | #[proc_macro_derive(m::d7)]
    | ^^^^^^^^^^^^^^^^^^^^-----^^
-   | |                   |
-   | |                   expected a valid identifier here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                     |
+   |                     expected a valid identifier here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(m::d7)]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(m::d7)]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0565]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:44:1
+  --> $DIR/attribute.rs:51:1
    |
 LL | #[proc_macro_derive(d8(a))]
    | ^^^^^^^^^^^^^^^^^^^^^^---^^
-   | |                     |
-   | |                     didn't expect any arguments here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                       |
+   |                       didn't expect any arguments here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d8(a))]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d8(a))]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:49:1
+  --> $DIR/attribute.rs:57:1
    |
 LL | #[proc_macro_derive(self)]
    | ^^^^^^^^^^^^^^^^^^^^----^^
-   | |                   |
-   | |                   expected a valid identifier here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                     |
+   |                     expected a valid identifier here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(self)]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(self)]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:57:1
+  --> $DIR/attribute.rs:66:1
    |
 LL | #[proc_macro_derive(d11, a)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^-^^
-   | |                        |
-   | |                        the only valid argument here is `attributes`
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                          |
+   |                          the only valid argument here is `attributes`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d11, a)]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d11, a)]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:62:1
+  --> $DIR/attribute.rs:72:1
    |
 LL | #[proc_macro_derive(d12, attributes)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^----------^^
-   | |                        |
-   | |                        expected this to be a list
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                          |
+   |                          expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d12, attributes)]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d12, attributes)]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:67:1
+  --> $DIR/attribute.rs:78:1
    |
 LL | #[proc_macro_derive(d13, attributes("a"))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---^^^
-   | |                                   |
-   | |                                   expected a valid identifier here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                                     |
+   |                                     expected a valid identifier here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d13, attributes("a"))]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d13, attributes("a"))]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0565]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:72:1
+  --> $DIR/attribute.rs:84:1
    |
 LL | #[proc_macro_derive(d14, attributes(a = ""))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^----^^^
-   | |                                     |
-   | |                                     didn't expect any arguments here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                                       |
+   |                                       didn't expect any arguments here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d14, attributes(a = ""))]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d14, attributes(a = ""))]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:77:1
+  --> $DIR/attribute.rs:90:1
    |
 LL | #[proc_macro_derive(d15, attributes(m::a))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^----^^^
-   | |                                   |
-   | |                                   expected a valid identifier here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                                     |
+   |                                     expected a valid identifier here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d15, attributes(m::a))]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d15, attributes(m::a))]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0565]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:82:1
+  --> $DIR/attribute.rs:96:1
    |
 LL | #[proc_macro_derive(d16, attributes(a(b)))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---^^^
-   | |                                    |
-   | |                                    didn't expect any arguments here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                                      |
+   |                                      didn't expect any arguments here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d16, attributes(a(b)))]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d16, attributes(a(b)))]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error[E0539]: malformed `proc_macro_derive` attribute input
-  --> $DIR/attribute.rs:87:1
+  --> $DIR/attribute.rs:102:1
    |
 LL | #[proc_macro_derive(d17, attributes(self))]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^----^^^
-   | |                                   |
-   | |                                   expected a valid identifier here
-   | help: must be of the form: `#[proc_macro_derive(TraitName, /*opt*/ attributes(name1, name2, ...))]`
+   |                                     |
+   |                                     expected a valid identifier here
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[proc_macro_derive(d17, attributes(self))]
+LL + #[proc_macro_derive(TraitName)]
+   |
+LL - #[proc_macro_derive(d17, attributes(self))]
+LL + #[proc_macro_derive(TraitName, attributes(name1, name2, ...))]
+   |
 
 error: aborting due to 16 previous errors
 
diff --git a/tests/ui/recursion_limit/invalid_digit_type.stderr b/tests/ui/recursion_limit/invalid_digit_type.stderr
index 94442b5747f..a122262f1df 100644
--- a/tests/ui/recursion_limit/invalid_digit_type.stderr
+++ b/tests/ui/recursion_limit/invalid_digit_type.stderr
@@ -3,6 +3,8 @@ error: malformed `recursion_limit` attribute input
    |
 LL | #![recursion_limit = 123]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![recursion_limit = "N"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/limits.html#the-recursion_limit-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/recursion_limit/invalid_macro.stderr b/tests/ui/recursion_limit/invalid_macro.stderr
index aa4894ec4d8..b4dbc9fcb13 100644
--- a/tests/ui/recursion_limit/invalid_macro.stderr
+++ b/tests/ui/recursion_limit/invalid_macro.stderr
@@ -3,6 +3,8 @@ error: malformed `recursion_limit` attribute input
    |
 LL | #![recursion_limit = foo!()]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![recursion_limit = "N"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/limits.html#the-recursion_limit-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/recursion_limit/no-value.stderr b/tests/ui/recursion_limit/no-value.stderr
index b2e8c46c372..4a0ad04f271 100644
--- a/tests/ui/recursion_limit/no-value.stderr
+++ b/tests/ui/recursion_limit/no-value.stderr
@@ -3,6 +3,8 @@ error: malformed `recursion_limit` attribute input
    |
 LL | #![recursion_limit]
    | ^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#![recursion_limit = "N"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/limits.html#the-recursion_limit-attribute>
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/repr/invalid_repr_list_help.stderr b/tests/ui/repr/invalid_repr_list_help.stderr
index 763ad9c2795..f9d1593275e 100644
--- a/tests/ui/repr/invalid_repr_list_help.stderr
+++ b/tests/ui/repr/invalid_repr_list_help.stderr
@@ -5,6 +5,7 @@ LL | #[repr(uwu)]
    |        ^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error[E0552]: unrecognized representation hint
   --> $DIR/invalid_repr_list_help.rs:6:8
@@ -13,6 +14,7 @@ LL | #[repr(uwu = "a")]
    |        ^^^^^^^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error[E0552]: unrecognized representation hint
   --> $DIR/invalid_repr_list_help.rs:9:8
@@ -21,6 +23,7 @@ LL | #[repr(uwu(4))]
    |        ^^^^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error[E0552]: unrecognized representation hint
   --> $DIR/invalid_repr_list_help.rs:14:8
@@ -29,6 +32,7 @@ LL | #[repr(uwu, u8)]
    |        ^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error[E0552]: unrecognized representation hint
   --> $DIR/invalid_repr_list_help.rs:19:8
@@ -37,6 +41,7 @@ LL | #[repr(uwu)]
    |        ^^^
    |
    = help: valid reprs are `Rust` (default), `C`, `align`, `packed`, `transparent`, `simd`, `i8`, `u8`, `i16`, `u16`, `i32`, `u32`, `i64`, `u64`, `i128`, `u128`, `isize`, `usize`
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html?highlight=repr#representations>
 
 error: unknown `doc` attribute `owo`
   --> $DIR/invalid_repr_list_help.rs:20:7
diff --git a/tests/ui/repr/repr.stderr b/tests/ui/repr/repr.stderr
index 9e581332278..d4faea12517 100644
--- a/tests/ui/repr/repr.stderr
+++ b/tests/ui/repr/repr.stderr
@@ -2,28 +2,66 @@ error[E0539]: malformed `repr` attribute input
   --> $DIR/repr.rs:1:1
    |
 LL | #[repr]
-   | ^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+   | ^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html#representations>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL | #[repr(<integer type>)]
+   |       ++++++++++++++++
+LL | #[repr(C)]
+   |       +++
+LL | #[repr(Rust)]
+   |       ++++++
+LL | #[repr(align(...))]
+   |       ++++++++++++
+   = and 2 other candidates
 
 error[E0539]: malformed `repr` attribute input
   --> $DIR/repr.rs:4:1
    |
 LL | #[repr = "B"]
-   | ^^^^^^^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+   | ^^^^^^^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html#representations>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[repr = "B"]
+LL + #[repr(<integer type>)]
+   |
+LL - #[repr = "B"]
+LL + #[repr(C)]
+   |
+LL - #[repr = "B"]
+LL + #[repr(Rust)]
+   |
+LL - #[repr = "B"]
+LL + #[repr(align(...))]
+   |
+   = and 2 other candidates
 
 error[E0539]: malformed `repr` attribute input
   --> $DIR/repr.rs:7:1
    |
 LL | #[repr = "C"]
-   | ^^^^^^^^^^^^^
-   | |
-   | expected this to be a list
-   | help: must be of the form: `#[repr(C | Rust | align(...) | packed(...) | <integer type> | transparent)]`
+   | ^^^^^^^^^^^^^ expected this to be a list
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/type-layout.html#representations>
+help: try changing it to one of the following valid forms of the attribute
+   |
+LL - #[repr = "C"]
+LL + #[repr(<integer type>)]
+   |
+LL - #[repr = "C"]
+LL + #[repr(C)]
+   |
+LL - #[repr = "C"]
+LL + #[repr(Rust)]
+   |
+LL - #[repr = "C"]
+LL + #[repr(align(...))]
+   |
+   = and 2 other candidates
 
 error: aborting due to 3 previous errors
 
diff --git a/tests/ui/resolve/path-attr-in-const-block.stderr b/tests/ui/resolve/path-attr-in-const-block.stderr
index 0b5942a287d..f3ae5b60c4f 100644
--- a/tests/ui/resolve/path-attr-in-const-block.stderr
+++ b/tests/ui/resolve/path-attr-in-const-block.stderr
@@ -12,6 +12,8 @@ LL |         #![path = foo!()]
    |         |         |
    |         |         expected a string literal here
    |         help: must be of the form: `#[path = "file"]`
+   |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/items/modules.html#the-path-attribute>
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/span/E0539.stderr b/tests/ui/span/E0539.stderr
index 01f091a2676..34d81b73cb5 100644
--- a/tests/ui/span/E0539.stderr
+++ b/tests/ui/span/E0539.stderr
@@ -6,10 +6,14 @@ LL | #[inline(unknown)]
    |          |
    |          valid arguments are `always` or `never`
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[inline(unknown)]
-LL + #[inline(always|never)]
+LL + #[inline(always)]
+   |
+LL - #[inline(unknown)]
+LL + #[inline(never)]
    |
 LL - #[inline(unknown)]
 LL + #[inline]
diff --git a/tests/ui/specialization/defaultimpl/validation.rs b/tests/ui/specialization/defaultimpl/validation.rs
index 14771be8982..78f6099c3dd 100644
--- a/tests/ui/specialization/defaultimpl/validation.rs
+++ b/tests/ui/specialization/defaultimpl/validation.rs
@@ -4,7 +4,7 @@
 struct S;
 struct Z;
 
-default impl S {} //~ ERROR inherent impls cannot be `default`
+default impl S {} //~ ERROR inherent impls cannot be default
 
 default unsafe impl Send for S {}
 //~^ ERROR impls of auto traits cannot be default
diff --git a/tests/ui/specialization/defaultimpl/validation.stderr b/tests/ui/specialization/defaultimpl/validation.stderr
index 82a33bf9cdc..a8dfef2dcfb 100644
--- a/tests/ui/specialization/defaultimpl/validation.stderr
+++ b/tests/ui/specialization/defaultimpl/validation.stderr
@@ -1,10 +1,10 @@
-error: inherent impls cannot be `default`
+error: inherent impls cannot be default
   --> $DIR/validation.rs:7:14
    |
 LL | default impl S {}
    | -------      ^ inherent impl for this type
    | |
-   | `default` because of this
+   | default because of this
    |
    = note: only trait implementations may be annotated with `default`
 
diff --git a/tests/ui/test-attrs/test-should-panic-attr.rs b/tests/ui/test-attrs/test-should-panic-attr.rs
index af54689551c..e6de07d0094 100644
--- a/tests/ui/test-attrs/test-should-panic-attr.rs
+++ b/tests/ui/test-attrs/test-should-panic-attr.rs
@@ -10,6 +10,7 @@ fn test1() {
 #[should_panic(expected)]
 //~^ ERROR malformed `should_panic` attribute input
 //~| NOTE expected this to be of the form `expected = "..."`
+//~| NOTE for more information, visit
 fn test2() {
     panic!();
 }
@@ -18,6 +19,7 @@ fn test2() {
 #[should_panic(expect)]
 //~^ ERROR malformed `should_panic` attribute input
 //~| NOTE the only valid argument here is "expected"
+//~| NOTE for more information, visit
 fn test3() {
     panic!();
 }
@@ -26,6 +28,7 @@ fn test3() {
 #[should_panic(expected(foo, bar))]
 //~^ ERROR malformed `should_panic` attribute input
 //~| NOTE expected this to be of the form `expected = "..."`
+//~| NOTE for more information, visit
 fn test4() {
     panic!();
 }
@@ -34,6 +37,7 @@ fn test4() {
 #[should_panic(expected = "foo", bar)]
 //~^ ERROR malformed `should_panic` attribute input
 //~| NOTE expected a single argument here
+//~| NOTE for more information, visit
 fn test5() {
     panic!();
 }
diff --git a/tests/ui/test-attrs/test-should-panic-attr.stderr b/tests/ui/test-attrs/test-should-panic-attr.stderr
index 5dfc8e503e8..475a55ad0cb 100644
--- a/tests/ui/test-attrs/test-should-panic-attr.stderr
+++ b/tests/ui/test-attrs/test-should-panic-attr.stderr
@@ -6,6 +6,7 @@ LL | #[should_panic(expected)]
    |                |
    |                expected this to be of the form `expected = "..."`
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/testing.html#the-should_panic-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[should_panic(expected)]
@@ -18,13 +19,14 @@ LL + #[should_panic]
    |
 
 error[E0539]: malformed `should_panic` attribute input
-  --> $DIR/test-should-panic-attr.rs:18:1
+  --> $DIR/test-should-panic-attr.rs:19:1
    |
 LL | #[should_panic(expect)]
    | ^^^^^^^^^^^^^^--------^
    |               |
    |               the only valid argument here is "expected"
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/testing.html#the-should_panic-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[should_panic(expect)]
@@ -37,13 +39,14 @@ LL + #[should_panic]
    |
 
 error[E0539]: malformed `should_panic` attribute input
-  --> $DIR/test-should-panic-attr.rs:26:1
+  --> $DIR/test-should-panic-attr.rs:28:1
    |
 LL | #[should_panic(expected(foo, bar))]
    | ^^^^^^^^^^^^^^^------------------^^
    |                |
    |                expected this to be of the form `expected = "..."`
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/testing.html#the-should_panic-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[should_panic(expected(foo, bar))]
@@ -57,13 +60,14 @@ LL + #[should_panic]
    |
 
 error[E0805]: malformed `should_panic` attribute input
-  --> $DIR/test-should-panic-attr.rs:34:1
+  --> $DIR/test-should-panic-attr.rs:37:1
    |
 LL | #[should_panic(expected = "foo", bar)]
    | ^^^^^^^^^^^^^^-----------------------^
    |               |
    |               expected a single argument here
    |
+   = note: for more information, visit <https://doc.rust-lang.org/reference/attributes/testing.html#the-should_panic-attribute>
 help: try changing it to one of the following valid forms of the attribute
    |
 LL - #[should_panic(expected = "foo", bar)]
diff --git a/tests/ui/traits/const-traits/inherent-impl.rs b/tests/ui/traits/const-traits/inherent-impl.rs
index 07b23adf9e1..5ca4c5d7863 100644
--- a/tests/ui/traits/const-traits/inherent-impl.rs
+++ b/tests/ui/traits/const-traits/inherent-impl.rs
@@ -5,9 +5,9 @@ struct S;
 trait T {}
 
 impl const S {}
-//~^ ERROR inherent impls cannot be `const`
+//~^ ERROR inherent impls cannot be const
 
 impl const dyn T {}
-//~^ ERROR inherent impls cannot be `const`
+//~^ ERROR inherent impls cannot be const
 
 fn main() {}
diff --git a/tests/ui/traits/const-traits/inherent-impl.stderr b/tests/ui/traits/const-traits/inherent-impl.stderr
index e4ec1e807b0..d828ecb6349 100644
--- a/tests/ui/traits/const-traits/inherent-impl.stderr
+++ b/tests/ui/traits/const-traits/inherent-impl.stderr
@@ -1,20 +1,20 @@
-error: inherent impls cannot be `const`
+error: inherent impls cannot be const
   --> $DIR/inherent-impl.rs:7:12
    |
 LL | impl const S {}
    |      ----- ^ inherent impl for this type
    |      |
-   |      `const` because of this
+   |      const because of this
    |
    = note: only trait implementations may be annotated with `const`
 
-error: inherent impls cannot be `const`
+error: inherent impls cannot be const
   --> $DIR/inherent-impl.rs:10:12
    |
 LL | impl const dyn T {}
    |      ----- ^^^^^ inherent impl for this type
    |      |
-   |      `const` because of this
+   |      const because of this
    |
    = note: only trait implementations may be annotated with `const`
 
diff --git a/tests/ui/traits/const-traits/macro-const-trait-bound-theoretical-regression.stderr b/tests/ui/traits/const-traits/macro-const-trait-bound-theoretical-regression.stderr
index af160a45f3e..9fad260f0be 100644
--- a/tests/ui/traits/const-traits/macro-const-trait-bound-theoretical-regression.stderr
+++ b/tests/ui/traits/const-traits/macro-const-trait-bound-theoretical-regression.stderr
@@ -1,15 +1,4 @@
-error: macro expansion ignores keyword `dyn` and any tokens following
-  --> $DIR/macro-const-trait-bound-theoretical-regression.rs:14:31
-   |
-LL |     (dyn $c:ident Trait) => { dyn $c Trait {} };
-   |                               ^^^
-...
-LL | demo! { dyn const Trait }
-   | ------------------------- caused by the macro expansion here
-   |
-   = note: the usage of `demo!` is likely invalid in item context
-
-error: inherent impls cannot be `const`
+error: inherent impls cannot be const
   --> $DIR/macro-const-trait-bound-theoretical-regression.rs:10:40
    |
 LL |     (impl $c:ident Trait) => { impl $c Trait {} };
@@ -18,12 +7,23 @@ LL |     (impl $c:ident Trait) => { impl $c Trait {} };
 LL | demo! { impl const Trait }
    | --------------------------
    | |            |
-   | |            `const` because of this
+   | |            const because of this
    | in this macro invocation
    |
    = note: only trait implementations may be annotated with `const`
    = note: this error originates in the macro `demo` (in Nightly builds, run with -Z macro-backtrace for more info)
 
+error: macro expansion ignores keyword `dyn` and any tokens following
+  --> $DIR/macro-const-trait-bound-theoretical-regression.rs:14:31
+   |
+LL |     (dyn $c:ident Trait) => { dyn $c Trait {} };
+   |                               ^^^
+...
+LL | demo! { dyn const Trait }
+   | ------------------------- caused by the macro expansion here
+   |
+   = note: the usage of `demo!` is likely invalid in item context
+
 error[E0658]: const trait impls are experimental
   --> $DIR/macro-const-trait-bound-theoretical-regression.rs:17:14
    |
diff --git a/tests/ui/traits/const-traits/span-bug-issue-121418.rs b/tests/ui/traits/const-traits/span-bug-issue-121418.rs
index 50a7e12f2a7..593180ac094 100644
--- a/tests/ui/traits/const-traits/span-bug-issue-121418.rs
+++ b/tests/ui/traits/const-traits/span-bug-issue-121418.rs
@@ -4,7 +4,7 @@ struct S;
 trait T {}
 
 impl const dyn T {
-    //~^ ERROR inherent impls cannot be `const`
+    //~^ ERROR inherent impls cannot be const
     pub const fn new() -> std::sync::Mutex<dyn T> {}
     //~^ ERROR mismatched types
     //~| ERROR cannot be known at compilation time
diff --git a/tests/ui/traits/const-traits/span-bug-issue-121418.stderr b/tests/ui/traits/const-traits/span-bug-issue-121418.stderr
index f31129d9cb7..0c8ca918a3e 100644
--- a/tests/ui/traits/const-traits/span-bug-issue-121418.stderr
+++ b/tests/ui/traits/const-traits/span-bug-issue-121418.stderr
@@ -1,10 +1,10 @@
-error: inherent impls cannot be `const`
+error: inherent impls cannot be const
   --> $DIR/span-bug-issue-121418.rs:6:12
    |
 LL | impl const dyn T {
    |      ----- ^^^^^ inherent impl for this type
    |      |
-   |      `const` because of this
+   |      const because of this
    |
    = note: only trait implementations may be annotated with `const`
 
diff --git a/tests/ui/traits/safety-inherent-impl.stderr b/tests/ui/traits/safety-inherent-impl.stderr
index 2513fef909e..45cdbe2b523 100644
--- a/tests/ui/traits/safety-inherent-impl.stderr
+++ b/tests/ui/traits/safety-inherent-impl.stderr
@@ -5,6 +5,8 @@ LL | unsafe impl SomeStruct {
    | ------      ^^^^^^^^^^ inherent impl for this type
    | |
    | unsafe because of this
+   |
+   = note: only trait implementations may be annotated with `unsafe`
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/traits/syntax-trait-polarity.stderr b/tests/ui/traits/syntax-trait-polarity.stderr
index 1fd40fb6657..8ffcdc7d8b5 100644
--- a/tests/ui/traits/syntax-trait-polarity.stderr
+++ b/tests/ui/traits/syntax-trait-polarity.stderr
@@ -5,15 +5,8 @@ LL | impl !TestType {}
    |      -^^^^^^^^ inherent impl for this type
    |      |
    |      negative because of this
-
-error[E0198]: negative impls cannot be unsafe
-  --> $DIR/syntax-trait-polarity.rs:12:13
    |
-LL | unsafe impl !Send for TestType {}
-   | ------      -^^^^
-   | |           |
-   | |           negative because of this
-   | unsafe because of this
+   = note: only trait implementations may be annotated with `!`
 
 error: inherent impls cannot be negative
   --> $DIR/syntax-trait-polarity.rs:18:10
@@ -22,6 +15,17 @@ LL | impl<T> !TestType2<T> {}
    |         -^^^^^^^^^^^^ inherent impl for this type
    |         |
    |         negative because of this
+   |
+   = note: only trait implementations may be annotated with `!`
+
+error[E0198]: negative impls cannot be unsafe
+  --> $DIR/syntax-trait-polarity.rs:12:13
+   |
+LL | unsafe impl !Send for TestType {}
+   | ------      -^^^^
+   | |           |
+   | |           negative because of this
+   | unsafe because of this
 
 error[E0198]: negative impls cannot be unsafe
   --> $DIR/syntax-trait-polarity.rs:21:16
diff --git a/tests/ui/unpretty/exhaustive.hir.stdout b/tests/ui/unpretty/exhaustive.hir.stdout
index 9cfa65f5801..e9823c9575b 100644
--- a/tests/ui/unpretty/exhaustive.hir.stdout
+++ b/tests/ui/unpretty/exhaustive.hir.stdout
@@ -509,7 +509,7 @@ mod items {
         impl () { }
         impl <T> () { }
         impl Default for () { }
-        impl const <T> Default for () { }
+        impl <T> const Default for () { }
     }
     /// ItemKind::MacCall
     mod item_mac_call { }
diff --git a/tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.fail.stderr b/tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.fail.stderr
new file mode 100644
index 00000000000..69be101a40d
--- /dev/null
+++ b/tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.fail.stderr
@@ -0,0 +1,18 @@
+error: unstable feature `foo` is used without being enabled.
+  --> $DIR/unstable_feature_bound_on_trait.rs:28:5
+   |
+LL |     Foo::bar();
+   |     ^^^^^^^^^^
+   |
+   = help: The feature can be enabled by marking the current item with `#[unstable_feature_bound(foo)]`
+note: required by a bound in `Bar::bar`
+  --> $DIR/unstable_feature_bound_on_trait.rs:16:1
+   |
+LL | #[unstable_feature_bound(foo)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Bar::bar`
+...
+LL |     fn bar() {}
+   |        --- required by a bound in this associated function
+
+error: aborting due to 1 previous error
+
diff --git a/tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.rs b/tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.rs
new file mode 100644
index 00000000000..0ee00d5e7fb
--- /dev/null
+++ b/tests/ui/unstable-feature-bound/unstable_feature_bound_on_trait.rs
@@ -0,0 +1,33 @@
+//@ revisions: pass fail
+//@[pass] check-pass
+
+#![allow(internal_features)]
+#![feature(staged_api)]
+#![stable(feature = "a", since = "1.1.1" )]
+
+/// Test the behaviour of marking a trait with #[unstable_feature_bound].
+/// In this testcase, even though the trait method `bar` and the `struct Foo` are
+/// both stable, #[unstable_feature_bound] is still needed at the call site of Foo::bar().
+
+#[stable(feature = "a", since = "1.1.1" )]
+struct Foo;
+
+#[unstable(feature = "foo", issue = "none" )]
+#[unstable_feature_bound(foo)]
+trait Bar {
+    #[stable(feature = "a", since = "1.1.1" )]
+    fn bar() {}
+}
+
+#[unstable_feature_bound(foo)]
+impl Bar for Foo {
+}
+
+#[cfg_attr(pass, unstable_feature_bound(foo))]
+fn moo() {
+    Foo::bar();
+    //[fail]~^ ERROR: unstable feature `foo` is used without being enabled.
+}
+
+
+fn main() {}
diff --git a/tests/ui/unstable-feature-bound/unstable_inherent_method.rs b/tests/ui/unstable-feature-bound/unstable_inherent_method.rs
index 5f3095430a8..0d6e4ebb408 100644
--- a/tests/ui/unstable-feature-bound/unstable_inherent_method.rs
+++ b/tests/ui/unstable-feature-bound/unstable_inherent_method.rs
@@ -9,14 +9,14 @@
 pub trait Trait {
     #[unstable(feature = "feat", issue = "none" )]
     #[unstable_feature_bound(foo)]
-    //~^ ERROR: attribute should be applied to `impl` or free function outside of any `impl` or trait
+    //~^ ERROR: attribute should be applied to `impl`, trait or free function
     fn foo();
 }
 
 #[stable(feature = "a", since = "1.1.1" )]
 impl Trait for u8 {
     #[unstable_feature_bound(foo)]
-    //~^ ERROR: attribute should be applied to `impl` or free function outside of any `impl` or trait
+    //~^ ERROR: attribute should be applied to `impl`, trait or free function
     fn foo() {}
 }
 
diff --git a/tests/ui/unstable-feature-bound/unstable_inherent_method.stderr b/tests/ui/unstable-feature-bound/unstable_inherent_method.stderr
index fa1c39db259..90cbb32df7c 100644
--- a/tests/ui/unstable-feature-bound/unstable_inherent_method.stderr
+++ b/tests/ui/unstable-feature-bound/unstable_inherent_method.stderr
@@ -1,20 +1,20 @@
-error: attribute should be applied to `impl` or free function outside of any `impl` or trait
+error: attribute should be applied to `impl`, trait or free function
   --> $DIR/unstable_inherent_method.rs:11:5
    |
 LL |     #[unstable_feature_bound(foo)]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 LL |
 LL |     fn foo();
-   |     --------- not an `impl` or free function
+   |     --------- not an `impl`, trait or free function
 
-error: attribute should be applied to `impl` or free function outside of any `impl` or trait
+error: attribute should be applied to `impl`, trait or free function
   --> $DIR/unstable_inherent_method.rs:18:5
    |
 LL |     #[unstable_feature_bound(foo)]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 LL |
 LL |     fn foo() {}
-   |     ----------- not an `impl` or free function
+   |     ----------- not an `impl`, trait or free function
 
 error: aborting due to 2 previous errors