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rustc: Panic by default in DefIdTree::parent

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Only crate root def-ids don't have a parent, and in majority of cases the argument of `DefIdTree::parent` cannot be a crate root.
So we now panic by default in `parent` and introduce a new non-panicing function `opt_parent` for cases where the argument can be a crate root.

Same applies to `local_parent`/`opt_local_parent`.
This commit is contained in:
Vadim Petrochenkov 2022-04-25 22:08:45 +03:00
parent a933de8398
commit 5b5964f569
50 changed files with 162 additions and 176 deletions
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2
compiler/rustc_resolve/src/build_reduced_graph.rs
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@ -1388,7 +1388,7 @@ impl<'a, 'b> Visitor<'b> for BuildReducedGraphVisitor<'a, 'b> {
&& self
.r
.trait_impl_items
.contains(&ty::DefIdTree::parent(&*self.r, def_id).unwrap().expect_local()))
.contains(&ty::DefIdTree::local_parent(&*self.r, local_def_id)))
{
// Trait impl item visibility is inherited from its trait when not specified
// explicitly. In that case we cannot determine it here in early resolve,