Rollup merge of #76823 - RalfJung:black-box-warn, r=joshtriplett
black_box: silence unused_mut warning when building with cfg(miri)
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@ -111,7 +111,7 @@ pub fn spin_loop() {
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#[cfg_attr(not(miri), inline)]
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#[cfg_attr(miri, inline(never))]
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#[unstable(feature = "test", issue = "50297")]
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#[allow(unreachable_code)] // this makes #[cfg] a bit easier below.
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#[cfg_attr(miri, allow(unused_mut))]
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pub fn black_box<T>(mut dummy: T) -> T {
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// We need to "use" the argument in some way LLVM can't introspect, and on
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// targets that support it we can typically leverage inline assembly to do
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