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Only encode RPITIT when trait method has default body

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This commit is contained in:
Michael Goulet 2022-09-11 09:35:43 +00:00
parent 1463688700
commit 1335da9d48
2 changed files with 22 additions and 1 deletions
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14
compiler/rustc_metadata/src/rmeta/encoder.rs
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@ -1036,7 +1036,6 @@ fn should_encode_type(tcx: TyCtxt<'_>, def_id: LocalDefId, def_kind: DefKind) ->
| DefKind::Static(..)
| DefKind::TyAlias
| DefKind::OpaqueTy
| DefKind::ImplTraitPlaceholder
| DefKind::ForeignTy
| DefKind::Impl
| DefKind::AssocFn
@ -1047,6 +1046,19 @@ fn should_encode_type(tcx: TyCtxt<'_>, def_id: LocalDefId, def_kind: DefKind) ->
| DefKind::AnonConst
| DefKind::InlineConst => true,
DefKind::ImplTraitPlaceholder => {
let parent_def_id = tcx.impl_trait_in_trait_parent(def_id.to_def_id());
let assoc_item = tcx.associated_item(parent_def_id);
match assoc_item.container {
// Always encode an RPIT in an impl fn, since it always has a body
ty::AssocItemContainer::ImplContainer => true,
ty::AssocItemContainer::TraitContainer => {
// Encode an RPIT for a trait only if the trait has a default body
assoc_item.defaultness(tcx).has_value()
}
}
}
DefKind::AssocTy => {
let assoc_item = tcx.associated_item(def_id);
match assoc_item.container {

9
src/test/ui/impl-trait/in-trait/encode.rs Normal file
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@ -0,0 +1,9 @@
// build-pass
// compile-flags: --crate-type=lib
#![feature(return_position_impl_trait_in_trait)]
#![allow(incomplete_features)]
trait Foo {
fn bar() -> impl Sized;
}