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Fix v0 symbol mangling bug

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Camelid 2021-05-11 16:20:52 -07:00 committed by Noah Lev
parent 2bafe96272
commit c34e7c60f5
1 changed files with 26 additions and 16 deletions
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42
compiler/rustc_symbol_mangling/src/v0.rs
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@ -485,27 +485,37 @@ impl Printer<'tcx> for SymbolMangler<'tcx> {
mut self,
predicates: &'tcx ty::List<ty::Binder<'tcx, ty::ExistentialPredicate<'tcx>>>,
) -> Result<Self::DynExistential, Self::Error> {
for predicate in predicates {
self = self.in_binder(&predicate, |mut cx, predicate| {
match predicate {
ty::ExistentialPredicate::Trait(trait_ref) => {
let mut predicate_iter = predicates.iter().peekable();
while let Some(predicate) = predicate_iter.next() {
match predicate.as_ref().skip_binder() {
ty::ExistentialPredicate::Trait(trait_ref) => {
self = self.in_binder(&predicate, |mut cx, _predicate| {
// Use a type that can't appear in defaults of type parameters.
let dummy_self = cx.tcx.mk_ty_infer(ty::FreshTy(0));
let trait_ref = trait_ref.with_self_ty(cx.tcx, dummy_self);
cx = cx.print_def_path(trait_ref.def_id, trait_ref.substs)?;
}
ty::ExistentialPredicate::Projection(projection) => {
let name = cx.tcx.associated_item(projection.item_def_id).ident;
cx.push("p");
cx.push_ident(&name.as_str());
cx = projection.ty.print(cx)?;
}
ty::ExistentialPredicate::AutoTrait(def_id) => {
cx = cx.print_def_path(*def_id, &[])?;
}
while let Some(projection_pred) = predicate_iter.next_if(|p| {
matches!(p.skip_binder(), ty::ExistentialPredicate::Projection(_))
}) {
let projection = match projection_pred.skip_binder() {
ty::ExistentialPredicate::Projection(projection) => projection,
_ => unreachable!(),
};
let name = cx.tcx.associated_item(projection.item_def_id).ident;
cx.push("p");
cx.push_ident(&name.as_str());
cx = projection.ty.print(cx)?;
}
Ok(cx)
})?;
}
Ok(cx)
})?;
ty::ExistentialPredicate::Projection(_) => {
unreachable!("handled in trait predicate arm")
}
ty::ExistentialPredicate::AutoTrait(def_id) => {
self = self.print_def_path(*def_id, &[])?;
}
}
}
self.push("E");
Ok(self)