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Note when a a move/borrow error is caused by a deref coercion

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Fixes #73268

When a deref coercion occurs, we may end up with a move error if the
base value has been partially moved out of. However, we do not indicate
anywhere that a deref coercion is occuring, resulting in an error
message with a confusing span.

This PR adds an explicit note to move errors when a deref coercion is
involved. We mention the name of the type that the deref-coercion
resolved to, as well as the `Deref::Target` associated type being used.
This commit is contained in:
Aaron Hill 2020-07-25 07:04:13 -04:00
parent a1947b3f9e
commit d18b4bb7a7
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GPG key ID: B4087E510E98B164
23 changed files with 250 additions and 54 deletions
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7
compiler/rustc_middle/src/ty/structural_impls.rs
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@ -606,8 +606,11 @@ impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::Adjust<'a> {
impl<'a, 'tcx> Lift<'tcx> for ty::adjustment::OverloadedDeref<'a> {
type Lifted = ty::adjustment::OverloadedDeref<'tcx>;
fn lift_to_tcx(&self, tcx: TyCtxt<'tcx>) -> Option<Self::Lifted> {
tcx.lift(&self.region)
.map(|region| ty::adjustment::OverloadedDeref { region, mutbl: self.mutbl })
tcx.lift(&self.region).map(|region| ty::adjustment::OverloadedDeref {
region,
mutbl: self.mutbl,
span: self.span,
})
}
}