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Remove a dead code path. #91493

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Merged
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Dec 7, 2021
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Remove a dead code path. #91493

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13 changes: 8 additions & 5 deletions compiler/rustc_infer/src/infer/opaque_types.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -461,10 +461,6 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
if let Some(def_id) = def_id.as_local() {
let opaque_hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
let parent_def_id = self.infcx.defining_use_anchor;
let def_scope_default = || {
let opaque_parent_hir_id = tcx.hir().get_parent_item(opaque_hir_id);
parent_def_id == tcx.hir().local_def_id(opaque_parent_hir_id)
};
let (in_definition_scope, origin) = match tcx.hir().expect_item(def_id).kind
{
// Anonymous `impl Trait`
Expand All @@ -481,7 +477,14 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
}) => {
(may_define_opaque_type(tcx, parent_def_id, opaque_hir_id), origin)
}
_ => (def_scope_default(), hir::OpaqueTyOrigin::TyAlias),
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This may be a leftover from impl-trait-in-bindings that we overlooked. We only have impl trait in return position and type alias impl trait, there are no other places that generate ty::Opaque, thus I concluded that this arm is unreachable.

ref itemkind => {
span_bug!(
self.value_span,
"weird opaque type: {:#?}, {:#?}",
ty.kind(),
itemkind
)
}
};
if in_definition_scope {
let opaque_type_key =
Expand Down