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exhaustive matching in get_ambient_variance

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This commit is contained in:
b-naber 2023-02-15 21:13:12 +00:00
parent 6e1d228285
commit 758cc95763
1 changed files with 9 additions and 1 deletions
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10
compiler/rustc_borrowck/src/type_check/mod.rs
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@ -767,9 +767,17 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
} }
fn get_ambient_variance(&self, context: PlaceContext) -> ty::Variance { fn get_ambient_variance(&self, context: PlaceContext) -> ty::Variance {
use rustc_middle::mir::visit::NonMutatingUseContext::*;
use rustc_middle::mir::visit::NonUseContext::*;
match context { match context {
PlaceContext::MutatingUse(_) => ty::Invariant, PlaceContext::MutatingUse(_) => ty::Invariant,
PlaceContext::NonMutatingUse(_) | PlaceContext::NonUse(_) => ty::Covariant, PlaceContext::NonUse(StorageDead | StorageLive | VarDebugInfo) => ty::Invariant,
PlaceContext::NonMutatingUse(
Inspect | Copy | Move | SharedBorrow | ShallowBorrow | UniqueBorrow | AddressOf
| Projection,
) => ty::Covariant,
PlaceContext::NonUse(AscribeUserTy) => ty::Covariant,
} }
} }