bjoernager/rust
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have better explanation for relate_types

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ouz-a 2023-10-02 11:22:48 +03:00
parent 6f0c5ee2d4
commit 5d753abb30
13 changed files with 40 additions and 34 deletions
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6
compiler/rustc_const_eval/src/util/compare_types.rs
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@ -30,9 +30,9 @@ pub fn is_equal_up_to_subtyping<'tcx>(
/// Returns whether `src` is a subtype of `dest`, i.e. `src <: dest`.
///
/// For almost all of the use cases variance should be `Covariant`,
/// in `MirPhase` >= `MirPhase::Runtime(RuntimePhase::Initial` variance should
/// be `Invariant`.
/// When validating assignments, the variance should be `Covariant`. When checking
/// during `MirPhase` >= `MirPhase::Runtime(RuntimePhase::Initial)` variance should be `Invariant`
/// because we want to check for type equality.
///
/// This mostly ignores opaque types as it can be used in constraining contexts
/// while still computing the final underlying type.