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Don't ICE when deducing future output if other errors already occurred

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This commit is contained in:
Oli Scherer 2024-01-17 14:52:38 +00:00
parent 25b706cde3
commit f1ef930c9d
5 changed files with 82 additions and 4 deletions
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14
compiler/rustc_hir_typeck/src/closure.rs
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@ -760,16 +760,22 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
get_future_output(obligation.predicate, obligation.cause.span)
})?
}
ty::Alias(ty::Projection, _) => {
return Some(Ty::new_error_with_message(
self.tcx,
closure_span,
"this projection should have been projected to an opaque type",
));
}
ty::Alias(ty::Opaque, ty::AliasTy { def_id, args, .. }) => self
.tcx
.explicit_item_bounds(def_id)
.iter_instantiated_copied(self.tcx, args)
.find_map(|(p, s)| get_future_output(p.as_predicate(), s))?,
ty::Error(_) => return Some(ret_ty),
_ => span_bug!(
closure_span,
"async fn coroutine return type not an inference variable: {ret_ty}"
),
_ => {
span_bug!(closure_span, "invalid async fn coroutine return type: {ret_ty:?}")
}
};
let output_ty = self.normalize(closure_span, output_ty);