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mark candidate set ambig for defaulted traits where self-type is not yet known

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Niko Matsakis 2015-02-19 11:28:01 -05:00 • committed by Flavio Percoco
parent 24bdce4bbf
commit e8df95d77f
1 changed files with 6 additions and 1 deletions
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7
src/librustc/middle/traits/select.rs
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@ -1143,8 +1143,13 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
}
match self_ty.sty {
ty::ty_infer(ty::TyVar(_)) |
ty::ty_trait(..) => {},
ty::ty_infer(ty::TyVar(_)) => {
// the defaulted impl might apply, we don't know
if ty::trait_has_default_impl(self.tcx(), def_id) {
candidates.ambiguous = true;
}
}
_ => {
if ty::trait_has_default_impl(self.tcx(), def_id) {
candidates.vec.push(DefaultImplCandidate(def_id.clone()))