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Add query to avoid name comparison in leaf_def

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Matthew Jasper 2021-11-18 22:29:07 +00:00 • committed by Noah Lev
parent 1b057a33bd
commit 3b7d496f72
8 changed files with 114 additions and 89 deletions
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28
compiler/rustc_trait_selection/src/traits/project.rs
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@ -1883,7 +1883,6 @@ fn assoc_ty_def(
assoc_ty_def_id: DefId,
) -> Result<specialization_graph::LeafDef, ErrorReported> {
let tcx = selcx.tcx();
let assoc_ty_name = tcx.associated_item(assoc_ty_def_id).ident;
let trait_def_id = tcx.impl_trait_ref(impl_def_id).unwrap().def_id;
let trait_def = tcx.trait_def(trait_def_id);
@ -1893,21 +1892,18 @@ fn assoc_ty_def(
// for the associated item at the given impl.
// If there is no such item in that impl, this function will fail with a
// cycle error if the specialization graph is currently being built.
let impl_node = specialization_graph::Node::Impl(impl_def_id);
for item in impl_node.items(tcx) {
if matches!(item.kind, ty::AssocKind::Type)
&& tcx.hygienic_eq(item.ident, assoc_ty_name, trait_def_id)
{
return Ok(specialization_graph::LeafDef {
item: *item,
defining_node: impl_node,
finalizing_node: if item.defaultness.is_default() { None } else { Some(impl_node) },
});
}
if let Some(&impl_item_id) = tcx.impl_item_implementor_ids(impl_def_id).get(&assoc_ty_def_id) {
let item = tcx.associated_item(impl_item_id);
let impl_node = specialization_graph::Node::Impl(impl_def_id);
return Ok(specialization_graph::LeafDef {
item: *item,
defining_node: impl_node,
finalizing_node: if item.defaultness.is_default() { None } else { Some(impl_node) },
});
}
let ancestors = trait_def.ancestors(tcx, impl_def_id)?;
if let Some(assoc_item) = ancestors.leaf_def(tcx, assoc_ty_name, ty::AssocKind::Type) {
if let Some(assoc_item) = ancestors.leaf_def(tcx, assoc_ty_def_id) {
Ok(assoc_item)
} else {
// This is saying that neither the trait nor
@ -1916,7 +1912,11 @@ fn assoc_ty_def(
// could only arise through a compiler bug --
// if the user wrote a bad item name, it
// should have failed in astconv.
bug!("No associated type `{}` for {}", assoc_ty_name, tcx.def_path_str(impl_def_id))
bug!(
"No associated type `{}` for {}",
tcx.item_name(assoc_ty_def_id),
tcx.def_path_str(impl_def_id)
)
}
}