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PartialEq: PERs are homogeneous #104912

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Dec 6, 2022
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PartialEq: PERs are homogeneous #104912

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5 changes: 3 additions & 2 deletions library/core/src/cmp.rs
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Expand Up @@ -29,15 +29,16 @@ 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.
///
/// 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:
///
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