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Rollup merge of #126703 - the8472:on-blackbox-crypto-use, r=scottmcm · model-checking/verify-rust-std@b6a3858

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@@ -263,7 +263,7 @@ pub fn spin_loop() {

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/// extent to which it can block optimisations may vary depending upon the platform and code-gen

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/// backend used. Programs cannot rely on `black_box` for *correctness*, beyond it behaving as the

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/// identity function. As such, it **must not be relied upon to control critical program behavior.**

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/// This _immediately_ precludes any direct use of this function for cryptographic or security

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/// This also means that this function does not offer any guarantees for cryptographic or security

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/// purposes.

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///

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/// [`std::convert::identity`]: crate::convert::identity