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Ensure careful consideration is given by impls

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Added an associated `const THIS_IMPLEMENTATION_HAS_BEEN_TRIPLE_CHECKED`
to the `StableOrd` trait to ensure that implementors carefully consider
whether the trait's contract is upheld, as incorrect implementations can
cause miscompilations.
This commit is contained in:
Alan Egerton 2024-06-22 07:11:42 +01:00
parent 114dd2061e
commit 0e73e7095a
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6 changed files with 60 additions and 13 deletions
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4
compiler/rustc_session/src/config.rs
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@ -491,9 +491,11 @@ pub enum OutputType {
DepInfo,
}
// Trivial C-Style enums have a stable sort order across compilation sessions.
impl StableOrd for OutputType {
const CAN_USE_UNSTABLE_SORT: bool = true;
// Trivial C-Style enums have a stable sort order across compilation sessions.
const THIS_IMPLEMENTATION_HAS_BEEN_TRIPLE_CHECKED: () = ();
}
impl<HCX: HashStableContext> ToStableHashKey<HCX> for OutputType {