Auto merge of #81135 - jyn514:no-backticks, r=flip1995

Fix formatting for removed lints

- Don't add backticks for the reason a lint was removed. This is almost
never a code block, and when it is the backticks should be in the reason
itself.
- Don't assume clippy is the only tool that needs to be checked for
backwards compatibility

I split this out of https://github.com/rust-lang/rust/pull/80527/ because it kept causing tests to fail, and it's a good change to have anyway.

r? `@flip1995`

8 files changed, 41 insertions, 42 deletions

diff --git a/compiler/rustc_lint/src/context.rs b/compiler/rustc_lint/src/context.rs
index 3971a309982..b1776599880 100644
--- a/compiler/rustc_lint/src/context.rs
+++ b/compiler/rustc_lint/src/context.rs
@@ -387,7 +387,7 @@ impl LintStore {
                 Some(new_name.to_owned()),
             ),
             Some(&Removed(ref reason)) => CheckLintNameResult::Warning(
-                format!("lint `{}` has been removed: `{}`", complete_name, reason),
+                format!("lint `{}` has been removed: {}", complete_name, reason),
                 None,
             ),
             None => match self.lint_groups.get(&*complete_name) {
diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs
index fc8f84461f9..18cd25e5d2a 100644
--- a/compiler/rustc_lint/src/levels.rs
+++ b/compiler/rustc_lint/src/levels.rs
@@ -311,8 +311,7 @@ impl<'s> LintLevelsBuilder<'s> {
                                     |lint| {
                                         let msg = format!(
                                             "lint name `{}` is deprecated \
-                                             and may not have an effect in the future. \
-                                             Also `cfg_attr(cargo-clippy)` won't be necessary anymore",
+                                             and may not have an effect in the future.",
                                             name
                                         );
                                         lint.build(&msg)
diff --git a/src/test/ui-fulldeps/lint-tool-test.stderr b/src/test/ui-fulldeps/lint-tool-test.stderr
index 5e1cb4fb843..2260477a91d 100644
--- a/src/test/ui-fulldeps/lint-tool-test.stderr
+++ b/src/test/ui-fulldeps/lint-tool-test.stderr
@@ -1,4 +1,4 @@
-warning: lint name `test_lint` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `test_lint` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:9:23
    |
 LL | #![cfg_attr(foo, warn(test_lint))]
@@ -6,13 +6,13 @@ LL | #![cfg_attr(foo, warn(test_lint))]
    |
    = note: `#[warn(renamed_and_removed_lints)]` on by default
 
-warning: lint name `clippy_group` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `clippy_group` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:13:9
    |
 LL | #![deny(clippy_group)]
    |         ^^^^^^^^^^^^ help: change it to: `clippy::group`
 
-warning: lint name `test_group` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `test_group` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:29:9
    |
 LL | #[allow(test_group)]
@@ -26,19 +26,19 @@ LL | #[deny(this_lint_does_not_exist)]
    |
    = note: `#[warn(unknown_lints)]` on by default
 
-warning: lint name `test_lint` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `test_lint` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:9:23
    |
 LL | #![cfg_attr(foo, warn(test_lint))]
    |                       ^^^^^^^^^ help: change it to: `clippy::test_lint`
 
-warning: lint name `clippy_group` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `clippy_group` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:13:9
    |
 LL | #![deny(clippy_group)]
    |         ^^^^^^^^^^^^ help: change it to: `clippy::group`
 
-warning: lint name `test_group` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `test_group` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:29:9
    |
 LL | #[allow(test_group)]
@@ -52,13 +52,13 @@ LL | #![plugin(lint_tool_test)]
    |
    = note: `#[warn(deprecated)]` on by default
 
-warning: lint name `test_lint` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `test_lint` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:9:23
    |
 LL | #![cfg_attr(foo, warn(test_lint))]
    |                       ^^^^^^^^^ help: change it to: `clippy::test_lint`
 
-warning: lint name `clippy_group` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `clippy_group` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:13:9
    |
 LL | #![deny(clippy_group)]
@@ -90,7 +90,7 @@ LL | #![deny(clippy_group)]
    |         ^^^^^^^^^^^^
    = note: `#[deny(clippy::test_group)]` implied by `#[deny(clippy::group)]`
 
-warning: lint name `test_group` is deprecated and may not have an effect in the future. Also `cfg_attr(cargo-clippy)` won't be necessary anymore
+warning: lint name `test_group` is deprecated and may not have an effect in the future.
   --> $DIR/lint-tool-test.rs:29:9
    |
 LL | #[allow(test_group)]
diff --git a/src/test/ui/lint/lint-removed-cmdline.stderr b/src/test/ui/lint/lint-removed-cmdline.stderr
index 1c45c38774e..fc2ba92479c 100644
--- a/src/test/ui/lint/lint-removed-cmdline.stderr
+++ b/src/test/ui/lint/lint-removed-cmdline.stderr
@@ -1,16 +1,16 @@
-warning: lint `raw_pointer_derive` has been removed: `using derive with raw pointers is ok`
+warning: lint `raw_pointer_derive` has been removed: using derive with raw pointers is ok
    |
    = note: requested on the command line with `-D raw_pointer_derive`
 
-warning: lint `raw_pointer_derive` has been removed: `using derive with raw pointers is ok`
+warning: lint `raw_pointer_derive` has been removed: using derive with raw pointers is ok
    |
    = note: requested on the command line with `-D raw_pointer_derive`
 
-warning: lint `raw_pointer_derive` has been removed: `using derive with raw pointers is ok`
+warning: lint `raw_pointer_derive` has been removed: using derive with raw pointers is ok
    |
    = note: requested on the command line with `-D raw_pointer_derive`
 
-warning: lint `raw_pointer_derive` has been removed: `using derive with raw pointers is ok`
+warning: lint `raw_pointer_derive` has been removed: using derive with raw pointers is ok
    |
    = note: requested on the command line with `-D raw_pointer_derive`
 
diff --git a/src/test/ui/lint/lint-removed.stderr b/src/test/ui/lint/lint-removed.stderr
index 44480d84203..dc0515b8482 100644
--- a/src/test/ui/lint/lint-removed.stderr
+++ b/src/test/ui/lint/lint-removed.stderr
@@ -1,4 +1,4 @@
-warning: lint `raw_pointer_derive` has been removed: `using derive with raw pointers is ok`
+warning: lint `raw_pointer_derive` has been removed: using derive with raw pointers is ok
   --> $DIR/lint-removed.rs:6:8
    |
 LL | #[deny(raw_pointer_derive)]
diff --git a/src/test/ui/lint/lint-unexported-no-mangle.stderr b/src/test/ui/lint/lint-unexported-no-mangle.stderr
index 48d9b38a99b..66d64e8937a 100644
--- a/src/test/ui/lint/lint-unexported-no-mangle.stderr
+++ b/src/test/ui/lint/lint-unexported-no-mangle.stderr
@@ -1,32 +1,32 @@
-warning: lint `private_no_mangle_fns` has been removed: `no longer a warning, `#[no_mangle]` functions always exported`
+warning: lint `private_no_mangle_fns` has been removed: no longer a warning, `#[no_mangle]` functions always exported
    |
    = note: requested on the command line with `-F private_no_mangle_fns`
 
-warning: lint `private_no_mangle_statics` has been removed: `no longer a warning, `#[no_mangle]` statics always exported`
+warning: lint `private_no_mangle_statics` has been removed: no longer a warning, `#[no_mangle]` statics always exported
    |
    = note: requested on the command line with `-F private_no_mangle_statics`
 
-warning: lint `private_no_mangle_fns` has been removed: `no longer a warning, `#[no_mangle]` functions always exported`
+warning: lint `private_no_mangle_fns` has been removed: no longer a warning, `#[no_mangle]` functions always exported
    |
    = note: requested on the command line with `-F private_no_mangle_fns`
 
-warning: lint `private_no_mangle_statics` has been removed: `no longer a warning, `#[no_mangle]` statics always exported`
+warning: lint `private_no_mangle_statics` has been removed: no longer a warning, `#[no_mangle]` statics always exported
    |
    = note: requested on the command line with `-F private_no_mangle_statics`
 
-warning: lint `private_no_mangle_fns` has been removed: `no longer a warning, `#[no_mangle]` functions always exported`
+warning: lint `private_no_mangle_fns` has been removed: no longer a warning, `#[no_mangle]` functions always exported
    |
    = note: requested on the command line with `-F private_no_mangle_fns`
 
-warning: lint `private_no_mangle_statics` has been removed: `no longer a warning, `#[no_mangle]` statics always exported`
+warning: lint `private_no_mangle_statics` has been removed: no longer a warning, `#[no_mangle]` statics always exported
    |
    = note: requested on the command line with `-F private_no_mangle_statics`
 
-warning: lint `private_no_mangle_fns` has been removed: `no longer a warning, `#[no_mangle]` functions always exported`
+warning: lint `private_no_mangle_fns` has been removed: no longer a warning, `#[no_mangle]` functions always exported
    |
    = note: requested on the command line with `-F private_no_mangle_fns`
 
-warning: lint `private_no_mangle_statics` has been removed: `no longer a warning, `#[no_mangle]` statics always exported`
+warning: lint `private_no_mangle_statics` has been removed: no longer a warning, `#[no_mangle]` statics always exported
    |
    = note: requested on the command line with `-F private_no_mangle_statics`
 
diff --git a/src/tools/clippy/tests/ui/deprecated.stderr b/src/tools/clippy/tests/ui/deprecated.stderr
index 3429317498e..f361db6b147 100644
--- a/src/tools/clippy/tests/ui/deprecated.stderr
+++ b/src/tools/clippy/tests/ui/deprecated.stderr
@@ -1,4 +1,4 @@
-error: lint `clippy::unstable_as_slice` has been removed: ``Vec::as_slice` has been stabilized in 1.7`
+error: lint `clippy::unstable_as_slice` has been removed: `Vec::as_slice` has been stabilized in 1.7
   --> $DIR/deprecated.rs:1:8
    |
 LL | #[warn(clippy::unstable_as_slice)]
@@ -6,73 +6,73 @@ LL | #[warn(clippy::unstable_as_slice)]
    |
    = note: `-D renamed-and-removed-lints` implied by `-D warnings`
 
-error: lint `clippy::unstable_as_mut_slice` has been removed: ``Vec::as_mut_slice` has been stabilized in 1.7`
+error: lint `clippy::unstable_as_mut_slice` has been removed: `Vec::as_mut_slice` has been stabilized in 1.7
   --> $DIR/deprecated.rs:2:8
    |
 LL | #[warn(clippy::unstable_as_mut_slice)]
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::misaligned_transmute` has been removed: `this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr`
+error: lint `clippy::misaligned_transmute` has been removed: this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr
   --> $DIR/deprecated.rs:3:8
    |
 LL | #[warn(clippy::misaligned_transmute)]
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::unused_collect` has been removed: ``collect` has been marked as #[must_use] in rustc and that covers all cases of this lint`
+error: lint `clippy::unused_collect` has been removed: `collect` has been marked as #[must_use] in rustc and that covers all cases of this lint
   --> $DIR/deprecated.rs:4:8
    |
 LL | #[warn(clippy::unused_collect)]
    |        ^^^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::invalid_ref` has been removed: `superseded by rustc lint `invalid_value``
+error: lint `clippy::invalid_ref` has been removed: superseded by rustc lint `invalid_value`
   --> $DIR/deprecated.rs:5:8
    |
 LL | #[warn(clippy::invalid_ref)]
    |        ^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::into_iter_on_array` has been removed: `this lint has been uplifted to rustc and is now called `array_into_iter``
+error: lint `clippy::into_iter_on_array` has been removed: this lint has been uplifted to rustc and is now called `array_into_iter`
   --> $DIR/deprecated.rs:6:8
    |
 LL | #[warn(clippy::into_iter_on_array)]
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::unused_label` has been removed: `this lint has been uplifted to rustc and is now called `unused_labels``
+error: lint `clippy::unused_label` has been removed: this lint has been uplifted to rustc and is now called `unused_labels`
   --> $DIR/deprecated.rs:7:8
    |
 LL | #[warn(clippy::unused_label)]
    |        ^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::regex_macro` has been removed: `the regex! macro has been removed from the regex crate in 2018`
+error: lint `clippy::regex_macro` has been removed: the regex! macro has been removed from the regex crate in 2018
   --> $DIR/deprecated.rs:8:8
    |
 LL | #[warn(clippy::regex_macro)]
    |        ^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::drop_bounds` has been removed: `this lint has been uplifted to rustc and is now called `drop_bounds``
+error: lint `clippy::drop_bounds` has been removed: this lint has been uplifted to rustc and is now called `drop_bounds`
   --> $DIR/deprecated.rs:9:8
    |
 LL | #[warn(clippy::drop_bounds)]
    |        ^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::temporary_cstring_as_ptr` has been removed: `this lint has been uplifted to rustc and is now called `temporary_cstring_as_ptr``
+error: lint `clippy::temporary_cstring_as_ptr` has been removed: this lint has been uplifted to rustc and is now called `temporary_cstring_as_ptr`
   --> $DIR/deprecated.rs:10:8
    |
 LL | #[warn(clippy::temporary_cstring_as_ptr)]
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::panic_params` has been removed: `this lint has been uplifted to rustc and is now called `panic_fmt``
+error: lint `clippy::panic_params` has been removed: this lint has been uplifted to rustc and is now called `panic_fmt`
   --> $DIR/deprecated.rs:11:8
    |
 LL | #[warn(clippy::panic_params)]
    |        ^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::unknown_clippy_lints` has been removed: `this lint has been integrated into the `unknown_lints` rustc lint`
+error: lint `clippy::unknown_clippy_lints` has been removed: this lint has been integrated into the `unknown_lints` rustc lint
   --> $DIR/deprecated.rs:12:8
    |
 LL | #[warn(clippy::unknown_clippy_lints)]
    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: lint `clippy::unstable_as_slice` has been removed: ``Vec::as_slice` has been stabilized in 1.7`
+error: lint `clippy::unstable_as_slice` has been removed: `Vec::as_slice` has been stabilized in 1.7
   --> $DIR/deprecated.rs:1:8
    |
 LL | #[warn(clippy::unstable_as_slice)]
diff --git a/src/tools/clippy/tests/ui/deprecated_old.stderr b/src/tools/clippy/tests/ui/deprecated_old.stderr
index 2fe1facf0c7..b8550078c46 100644
--- a/src/tools/clippy/tests/ui/deprecated_old.stderr
+++ b/src/tools/clippy/tests/ui/deprecated_old.stderr
@@ -1,4 +1,4 @@
-error: lint `unstable_as_slice` has been removed: ``Vec::as_slice` has been stabilized in 1.7`
+error: lint `unstable_as_slice` has been removed: `Vec::as_slice` has been stabilized in 1.7
   --> $DIR/deprecated_old.rs:1:8
    |
 LL | #[warn(unstable_as_slice)]
@@ -6,19 +6,19 @@ LL | #[warn(unstable_as_slice)]
    |
    = note: `-D renamed-and-removed-lints` implied by `-D warnings`
 
-error: lint `unstable_as_mut_slice` has been removed: ``Vec::as_mut_slice` has been stabilized in 1.7`
+error: lint `unstable_as_mut_slice` has been removed: `Vec::as_mut_slice` has been stabilized in 1.7
   --> $DIR/deprecated_old.rs:2:8
    |
 LL | #[warn(unstable_as_mut_slice)]
    |        ^^^^^^^^^^^^^^^^^^^^^
 
-error: lint `misaligned_transmute` has been removed: `this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr`
+error: lint `misaligned_transmute` has been removed: this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr
   --> $DIR/deprecated_old.rs:3:8
    |
 LL | #[warn(misaligned_transmute)]
    |        ^^^^^^^^^^^^^^^^^^^^
 
-error: lint `unstable_as_slice` has been removed: ``Vec::as_slice` has been stabilized in 1.7`
+error: lint `unstable_as_slice` has been removed: `Vec::as_slice` has been stabilized in 1.7
   --> $DIR/deprecated_old.rs:1:8
    |
 LL | #[warn(unstable_as_slice)]