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black_box: silence unused_mut warning when building with cfg(miri)

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Ralf Jung 2020-09-17 08:59:30 +02:00
parent 95386b656e
commit 1dd3df6738
1 changed files with 1 additions and 1 deletions
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library/core/src/hint.rs
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@ -110,7 +110,7 @@ pub fn spin_loop() {
/// backend used. Programs cannot rely on `black_box` for *correctness* in any way. /// backend used. Programs cannot rely on `black_box` for *correctness* in any way.
#[inline] #[inline]
#[unstable(feature = "test", issue = "50297")] #[unstable(feature = "test", issue = "50297")]
#[allow(unreachable_code)] // this makes #[cfg] a bit easier below. #[cfg_attr(miri, allow(unused_mut))]
pub fn black_box<T>(mut dummy: T) -> T { pub fn black_box<T>(mut dummy: T) -> T {
// We need to "use" the argument in some way LLVM can't introspect, and on // We need to "use" the argument in some way LLVM can't introspect, and on
// targets that support it we can typically leverage inline assembly to do // targets that support it we can typically leverage inline assembly to do