Auto merge of #93009 - matthiaskrgr:rollup-3fkxg6i, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #90498 (Clarifications in the target tier policy)
 - #92164 (Implement `#[rustc_must_implement_one_of]` attribute)
 - #92729 (rustc_codegen_llvm: Remove (almost) unused span parameter from many functions in metadata.rs)
 - #92752 (Correct minor typos in some long error code explanations)
 - #92801 (Enable wrapping words by default)
 - #92825 (Rename environment variable for overriding rustc version)
 - #92877 (Remove LLVMRustMarkAllFunctionsNounwind)
 - #92936 (rustdoc: Remove `collect` in `html::markdown::parse`)
 - #92956 (Add `log2` and `log10` to `NonZeroU*`)
 - #92960 (Use `carrying_{mul|add}` in `num::bignum`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

10 files changed, 258 insertions, 2 deletions

diff --git a/src/test/incremental/cache_file_headers.rs b/src/test/incremental/cache_file_headers.rs
index 7f1ef886ac8..9cf611c3379 100644
--- a/src/test/incremental/cache_file_headers.rs
+++ b/src/test/incremental/cache_file_headers.rs
@@ -7,7 +7,7 @@
 
 // The `l33t haxx0r` Rust compiler is known to produce incr. comp. artifacts
 // that are outrageously incompatible with just about anything, even itself:
-//[rpass1] rustc-env:RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER="l33t haxx0r rustc 2.1 LTS"
+//[rpass1] rustc-env:RUSTC_FORCE_RUSTC_VERSION="l33t haxx0r rustc 2.1 LTS"
 
 // revisions:rpass1 rpass2
 // compile-flags: -Z query-dep-graph
diff --git a/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile b/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile
index fd66702db7f..091508cd805 100644
--- a/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile
+++ b/src/test/run-make-fulldeps/crate-hash-rustc-version/Makefile
@@ -27,7 +27,7 @@ all:
 	$(RUSTC) b.rs --extern a=$(TMPDIR)/liba$(EXT) --crate-type=bin -Crpath $(FLAGS)
 	$(call RUN,b)
 	# Now re-compile a.rs with another rustc version
-	RUSTC_FORCE_INCR_COMP_ARTIFACT_HEADER=deadfeed $(RUSTC) a.rs --crate-type=dylib $(FLAGS)
+	RUSTC_FORCE_RUSTC_VERSION=deadfeed $(RUSTC) a.rs --crate-type=dylib $(FLAGS)
 	# After compiling with a different rustc version, write symbols to disk again.
 	$(NM_CMD) $(call DYLIB,a) > $(TMPDIR)/symbolsafter
 	# As a sanity check, test if the symbols changed:
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of.rs b/src/test/ui/traits/default-method/rustc_must_implement_one_of.rs
new file mode 100644
index 00000000000..5ba2f5ce334
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of.rs
@@ -0,0 +1,44 @@
+#![feature(rustc_attrs)]
+
+#[rustc_must_implement_one_of(eq, neq)]
+trait Equal {
+    fn eq(&self, other: &Self) -> bool {
+        !self.neq(other)
+    }
+
+    fn neq(&self, other: &Self) -> bool {
+        !self.eq(other)
+    }
+}
+
+struct T0;
+struct T1;
+struct T2;
+struct T3;
+
+impl Equal for T0 {
+    fn eq(&self, _other: &Self) -> bool {
+        true
+    }
+}
+
+impl Equal for T1 {
+    fn neq(&self, _other: &Self) -> bool {
+        false
+    }
+}
+
+impl Equal for T2 {
+    fn eq(&self, _other: &Self) -> bool {
+        true
+    }
+
+    fn neq(&self, _other: &Self) -> bool {
+        false
+    }
+}
+
+impl Equal for T3 {}
+//~^ not all trait items implemented, missing one of: `eq`, `neq`
+
+fn main() {}
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of.stderr b/src/test/ui/traits/default-method/rustc_must_implement_one_of.stderr
new file mode 100644
index 00000000000..5a4dd1388b2
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of.stderr
@@ -0,0 +1,15 @@
+error[E0046]: not all trait items implemented, missing one of: `eq`, `neq`
+  --> $DIR/rustc_must_implement_one_of.rs:41:1
+   |
+LL | impl Equal for T3 {}
+   | ^^^^^^^^^^^^^^^^^ missing one of `eq`, `neq` in implementation
+   |
+note: required because of this annotation
+  --> $DIR/rustc_must_implement_one_of.rs:3:1
+   |
+LL | #[rustc_must_implement_one_of(eq, neq)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0046`.
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_duplicates.rs b/src/test/ui/traits/default-method/rustc_must_implement_one_of_duplicates.rs
new file mode 100644
index 00000000000..56e8fcff0fc
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_duplicates.rs
@@ -0,0 +1,19 @@
+#![feature(rustc_attrs)]
+
+#[rustc_must_implement_one_of(a, a)]
+//~^ Functions names are duplicated
+trait Trait {
+    fn a() {}
+}
+
+#[rustc_must_implement_one_of(b, a, a, c, b, c)]
+//~^ Functions names are duplicated
+//~| Functions names are duplicated
+//~| Functions names are duplicated
+trait Trait1 {
+    fn a() {}
+    fn b() {}
+    fn c() {}
+}
+
+fn main() {}
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_duplicates.stderr b/src/test/ui/traits/default-method/rustc_must_implement_one_of_duplicates.stderr
new file mode 100644
index 00000000000..777beba6182
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_duplicates.stderr
@@ -0,0 +1,34 @@
+error: Functions names are duplicated
+  --> $DIR/rustc_must_implement_one_of_duplicates.rs:3:31
+   |
+LL | #[rustc_must_implement_one_of(a, a)]
+   |                               ^  ^
+   |
+   = note: All `#[rustc_must_implement_one_of]` arguments must be unique
+
+error: Functions names are duplicated
+  --> $DIR/rustc_must_implement_one_of_duplicates.rs:9:34
+   |
+LL | #[rustc_must_implement_one_of(b, a, a, c, b, c)]
+   |                                  ^  ^
+   |
+   = note: All `#[rustc_must_implement_one_of]` arguments must be unique
+
+error: Functions names are duplicated
+  --> $DIR/rustc_must_implement_one_of_duplicates.rs:9:31
+   |
+LL | #[rustc_must_implement_one_of(b, a, a, c, b, c)]
+   |                               ^           ^
+   |
+   = note: All `#[rustc_must_implement_one_of]` arguments must be unique
+
+error: Functions names are duplicated
+  --> $DIR/rustc_must_implement_one_of_duplicates.rs:9:40
+   |
+LL | #[rustc_must_implement_one_of(b, a, a, c, b, c)]
+   |                                        ^     ^
+   |
+   = note: All `#[rustc_must_implement_one_of]` arguments must be unique
+
+error: aborting due to 4 previous errors
+
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.rs b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.rs
new file mode 100644
index 00000000000..ec2995872de
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.rs
@@ -0,0 +1,13 @@
+#[rustc_must_implement_one_of(eq, neq)]
+//~^ the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete definition of a trait, it's currently in experimental form and should be changed before being exposed outside of the std
+trait Equal {
+    fn eq(&self, other: &Self) -> bool {
+        !self.neq(other)
+    }
+
+    fn neq(&self, other: &Self) -> bool {
+        !self.eq(other)
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr
new file mode 100644
index 00000000000..228bc3e35c2
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_gated.stderr
@@ -0,0 +1,11 @@
+error[E0658]: the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete definition of a trait, it's currently in experimental form and should be changed before being exposed outside of the std
+  --> $DIR/rustc_must_implement_one_of_gated.rs:1:1
+   |
+LL | #[rustc_must_implement_one_of(eq, neq)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.rs b/src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.rs
new file mode 100644
index 00000000000..1089e5f9c4a
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.rs
@@ -0,0 +1,38 @@
+#![feature(rustc_attrs)]
+
+#[rustc_must_implement_one_of(a, b)]
+//~^ Function not found in this trait
+//~| Function not found in this trait
+trait Tr0 {}
+
+#[rustc_must_implement_one_of(a, b)]
+//~^ Function not found in this trait
+trait Tr1 {
+    fn a() {}
+}
+
+#[rustc_must_implement_one_of(a)]
+//~^ the `#[rustc_must_implement_one_of]` attribute must be used with at least 2 args
+trait Tr2 {
+    fn a() {}
+}
+
+#[rustc_must_implement_one_of]
+//~^ malformed `rustc_must_implement_one_of` attribute input
+trait Tr3 {}
+
+#[rustc_must_implement_one_of(A, B)]
+trait Tr4 {
+    const A: u8 = 1; //~ Not a function
+
+    type B; //~ Not a function
+}
+
+#[rustc_must_implement_one_of(a, b)]
+trait Tr5 {
+    fn a(); //~ This function doesn't have a default implementation
+
+    fn b(); //~ This function doesn't have a default implementation
+}
+
+fn main() {}
diff --git a/src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr b/src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr
new file mode 100644
index 00000000000..74a6dc8fec9
--- /dev/null
+++ b/src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr
@@ -0,0 +1,82 @@
+error: malformed `rustc_must_implement_one_of` attribute input
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:20:1
+   |
+LL | #[rustc_must_implement_one_of]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_must_implement_one_of(function1, function2, ...)]`
+
+error: Function not found in this trait
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:31
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   |                               ^
+
+error: Function not found in this trait
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:3:34
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   |                                  ^
+
+error: Function not found in this trait
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:8:34
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   |                                  ^
+
+error: the `#[rustc_must_implement_one_of]` attribute must be used with at least 2 args
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:14:1
+   |
+LL | #[rustc_must_implement_one_of(a)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: Not a function
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:26:5
+   |
+LL |     const A: u8 = 1;
+   |     ^^^^^^^^^^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:24:1
+   |
+LL | #[rustc_must_implement_one_of(A, B)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: All `#[rustc_must_implement_one_of]` arguments must be associated function names
+
+error: Not a function
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:28:5
+   |
+LL |     type B;
+   |     ^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:24:1
+   |
+LL | #[rustc_must_implement_one_of(A, B)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = note: All `#[rustc_must_implement_one_of]` arguments must be associated function names
+
+error: This function doesn't have a default implementation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:33:5
+   |
+LL |     fn a();
+   |     ^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:31:1
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: This function doesn't have a default implementation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:35:5
+   |
+LL |     fn b();
+   |     ^^^^^^^
+   |
+note: required by this annotation
+  --> $DIR/rustc_must_implement_one_of_misuse.rs:31:1
+   |
+LL | #[rustc_must_implement_one_of(a, b)]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 9 previous errors
+