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Do not implement HashStable for HashSet.

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This commit is contained in:
Michael Woerister 2023-02-21 15:29:12 +01:00
parent 04e5fa3ce2
commit b79f0261f8
1 changed files with 4 additions and 12 deletions
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16
compiler/rustc_data_structures/src/stable_hasher.rs
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@ -617,18 +617,10 @@ where
}
}
impl<K, R, HCX> HashStable<HCX> for ::std::collections::HashSet<K, R>
where
K: ToStableHashKey<HCX> + Eq,
R: BuildHasher,
{
fn hash_stable(&self, hcx: &mut HCX, hasher: &mut StableHasher) {
stable_hash_reduce(hcx, hasher, self.iter(), self.len(), |hasher, hcx, key| {
let key = key.to_stable_hash_key(hcx);
key.hash_stable(hcx, hasher);
});
}
}
// It is not safe to implement HashStable for HashSet or any other collection type
// with unstable but observable iteration order.
// See https://github.com/rust-lang/compiler-team/issues/533 for further information.
impl<V, HCX> !HashStable<HCX> for std::collections::HashSet<V> {}
impl<K, V, HCX> HashStable<HCX> for ::std::collections::BTreeMap<K, V>
where