Auto merge of #124208 - jieyouxu:rollup-gbgpu4u, r=jieyouxu

Rollup of 10 pull requests

Successful merges:

 - #123379 (Print note with closure signature on type mismatch)
 - #123967 (static_mut_refs: use raw pointers to remove the remaining FIXME)
 - #123976 (Use fake libc in core test)
 - #123986 (lint-docs: Add redirects for renamed lints.)
 - #124053 (coverage: Branch coverage tests for lazy boolean operators)
 - #124071 (Add llvm-bitcode-linker to build manifest)
 - #124103 (Improve std::fs::Metadata Debug representation)
 - #124132 (llvm RustWrapper: explain OpBundlesIndirect argument type)
 - #124191 (Give a name to each distinct manipulation of pretty-printer FixupContext)
 - #124196 (mir-opt tests: rename unit-test -> test-mir-pass)

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

library/core/src/primitive_docs.rs

@@ -537,7 +537,11 @@ impl () {}
 /// ## 4. Get it from C.
 ///
 /// ```
-/// # #![feature(rustc_private)]
+/// # mod libc {
+/// # pub unsafe fn malloc(_size: usize) -> *mut core::ffi::c_void { core::ptr::NonNull::dangling().as_ptr() }
+/// # pub unsafe fn free(_ptr: *mut core::ffi::c_void) {}
+/// # }
+/// # #[cfg(any())]
 /// #[allow(unused_extern_crates)]
 /// extern crate libc;
 ///
@@ -548,7 +552,7 @@ impl () {}
 ///     if my_num.is_null() {
 ///         panic!("failed to allocate memory");
 ///     }
-///     libc::free(my_num as *mut libc::c_void);
+///     libc::free(my_num as *mut core::ffi::c_void);
 /// }
 /// ```
 ///