Auto merge of #142483 - workingjubilee:rollup-8qnhueh, r=workingjubilee

Rollup of 16 pull requests

Successful merges:

 - rust-lang/rust#140969 (Allow initializing logger with additional tracing Layer)
 - rust-lang/rust#141352 (builtin dyn impl no guide inference)
 - rust-lang/rust#142046 (add Vec::peek_mut)
 - rust-lang/rust#142273 (tests: Minicore `extern "gpu-kernel"` feature test)
 - rust-lang/rust#142302 (Rework how the disallowed qualifier in function type diagnostics are generated)
 - rust-lang/rust#142405 (Don't hardcode the intrinsic return types twice in the compiler)
 - rust-lang/rust#142434 ( Pre-install JS dependencies in tidy Dockerfile)
 - rust-lang/rust#142439 (doc: mention that intrinsics should not be called in user code)
 - rust-lang/rust#142441 (Delay replacing escaping bound vars in `FindParamInClause`)
 - rust-lang/rust#142449 (Require generic params for const generic params)
 - rust-lang/rust#142452 (Remove "intermittent" wording from `ReadDir`)
 - rust-lang/rust#142459 (Remove output helper bootstrap)
 - rust-lang/rust#142460 (cleanup search graph impl)
 - rust-lang/rust#142461 (compiletest: Clarify that `--no-capture` is needed with `--verbose`)
 - rust-lang/rust#142475 (Add platform support docs & maintainers for *-windows-msvc)
 - rust-lang/rust#142480 (tests: Convert two handwritten minicores to add-core-stubs)

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

1 files changed, 17 insertions, 0 deletions

diff --git a/library/alloctests/tests/vec.rs b/library/alloctests/tests/vec.rs
index f430d979fa8..51b49b8edb3 100644
--- a/library/alloctests/tests/vec.rs
+++ b/library/alloctests/tests/vec.rs
@@ -2698,6 +2698,23 @@ fn test_pop_if_mutates() {
     assert_eq!(v, [2]);
 }
 
+#[test]
+fn test_peek_mut() {
+    let mut vec = Vec::new();
+    assert!(vec.peek_mut().is_none());
+    vec.push(1);
+    vec.push(2);
+    if let Some(mut p) = vec.peek_mut() {
+        assert_eq!(*p, 2);
+        *p = 0;
+        assert_eq!(*p, 0);
+        p.pop();
+        assert_eq!(vec.len(), 1);
+    } else {
+        unreachable!()
+    }
+}
+
 /// This assortment of tests, in combination with miri, verifies we handle UB on fishy arguments
 /// in the stdlib. Draining and extending the allocation are fairly well-tested earlier, but
 /// `vec.insert(usize::MAX, val)` once slipped by!