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make Sized coinductive

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lcnr 2021-03-29 17:32:20 +02:00 • committed by Michael Goulet
parent a3c0a02361
commit 0f2e45b18f
3 changed files with 46 additions and 1 deletions
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5
compiler/rustc_trait_selection/src/traits/select/mod.rs
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@ -959,7 +959,10 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
fn coinductive_predicate(&self, predicate: ty::Predicate<'tcx>) -> bool {
let result = match predicate.kind().skip_binder() {
ty::PredicateKind::Trait(ref data) => self.tcx().trait_is_auto(data.def_id()),
ty::PredicateKind::Trait(ref data) => {
self.tcx().trait_is_auto(data.def_id())
|| self.tcx().lang_items().sized_trait() == Some(data.def_id())
}
ty::PredicateKind::WellFormed(_) => true,
_ => false,
};