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Rollup merge of #104912 - RalfJung:per, r=Mark-Simulacrum

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PartialEq: PERs are homogeneous

PartialEq claims that it corresponds to a PER, but that is only a well-defined statement when `Rhs == Self`. There is no standard notion of PER on a relation between two different sets/types. So move this out of the first paragraph and clarify this.
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Matthias Krüger 2022-12-05 20:43:40 +01:00 committed by GitHub
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library/core/src/cmp.rs
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@ -29,8 +29,7 @@ use crate::marker::StructuralPartialEq;
use self::Ordering::*;
/// Trait for equality comparisons which are [partial equivalence
/// relations](https://en.wikipedia.org/wiki/Partial_equivalence_relation).
/// Trait for equality comparisons.
///
/// `x.eq(y)` can also be written `x == y`, and `x.ne(y)` can be written `x != y`.
/// We use the easier-to-read infix notation in the remainder of this documentation.
@ -38,6 +37,8 @@ use self::Ordering::*;
/// This trait allows for partial equality, for types that do not have a full
/// equivalence relation. For example, in floating point numbers `NaN != NaN`,
/// so floating point types implement `PartialEq` but not [`trait@Eq`].
/// Formally speaking, when `Rhs == Self`, this trait corresponds to a [partial equivalence
/// relation](https://en.wikipedia.org/wiki/Partial_equivalence_relation).
///
/// Implementations must ensure that `eq` and `ne` are consistent with each other:
///