bjoernager/rust
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Fix diagnostic issue when using FakeReads in closures

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This commit is contained in:
Roxane 2021-03-25 23:03:12 -04:00
parent 138fd56cf9
commit 2fb1fb7634
31 changed files with 119 additions and 80 deletions
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21
compiler/rustc_typeck/src/expr_use_visitor.rs
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@ -280,9 +280,14 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
if needs_to_be_read {
self.borrow_expr(&discr, ty::ImmBorrow);
} else {
let closure_def_id = match discr_place.place.base {
PlaceBase::Upvar(upvar_id) => Some(upvar_id.closure_expr_id.to_def_id()),
_ => None,
};
self.delegate.fake_read(
discr_place.place.clone(),
FakeReadCause::ForMatchedPlace,
FakeReadCause::ForMatchedPlace(closure_def_id),
discr_place.hir_id,
);
@ -578,9 +583,14 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
}
fn walk_arm(&mut self, discr_place: &PlaceWithHirId<'tcx>, arm: &hir::Arm<'_>) {
let closure_def_id = match discr_place.place.base {
PlaceBase::Upvar(upvar_id) => Some(upvar_id.closure_expr_id.to_def_id()),
_ => None,
};
self.delegate.fake_read(
discr_place.place.clone(),
FakeReadCause::ForMatchedPlace,
FakeReadCause::ForMatchedPlace(closure_def_id),
discr_place.hir_id,
);
self.walk_pat(discr_place, &arm.pat);
@ -595,9 +605,14 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
/// Walks a pat that occurs in isolation (i.e., top-level of fn argument or
/// let binding, and *not* a match arm or nested pat.)
fn walk_irrefutable_pat(&mut self, discr_place: &PlaceWithHirId<'tcx>, pat: &hir::Pat<'_>) {
let closure_def_id = match discr_place.place.base {
PlaceBase::Upvar(upvar_id) => Some(upvar_id.closure_expr_id.to_def_id()),
_ => None,
};
self.delegate.fake_read(
discr_place.place.clone(),
FakeReadCause::ForLet,
FakeReadCause::ForLet(closure_def_id),
discr_place.hir_id,
);
self.walk_pat(discr_place, pat);