bjoernager/rust
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Add try_fold_uenevaluted.

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We already have `visit_unevaluated`, so this improves consistency.

Also, define `TypeFoldable for Unevaluated<'tcx, ()>` in terms of
`TypeFoldable for Unevaluated<'tcx>`, which is neater.
This commit is contained in:
Nicholas Nethercote 2022-06-01 17:20:56 +10:00
parent 6ba2dfd330
commit 23880a058b
2 changed files with 20 additions and 10 deletions
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16
compiler/rustc_middle/src/ty/structural_impls.rs
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@ -1228,6 +1228,10 @@ impl<'tcx> TypeFoldable<'tcx> for InferConst<'tcx> {
}
impl<'tcx> TypeFoldable<'tcx> for ty::Unevaluated<'tcx> {
fn try_fold_with<F: FallibleTypeFolder<'tcx>>(self, folder: &mut F) -> Result<Self, F::Error> {
folder.try_fold_unevaluated(self)
}
fn try_super_fold_with<F: FallibleTypeFolder<'tcx>>(
self,
folder: &mut F,
@ -1253,19 +1257,11 @@ impl<'tcx> TypeFoldable<'tcx> for ty::Unevaluated<'tcx, ()> {
self,
folder: &mut F,
) -> Result<Self, F::Error> {
Ok(ty::Unevaluated {
def: self.def,
substs: self.substs.try_fold_with(folder)?,
promoted: self.promoted,
})
}
fn visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
visitor.visit_unevaluated(self.expand())
Ok(self.expand().try_fold_with(folder)?.shrink())
}
fn super_visit_with<V: TypeVisitor<'tcx>>(&self, visitor: &mut V) -> ControlFlow<V::BreakTy> {
self.substs.visit_with(visitor)
self.expand().visit_with(visitor)
}
}