resolve: Make disambiguators for underscore bindings module-local #144013
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Jul 16, 2025
| @@ -531,7 +531,7 @@ impl<'ra, 'tcx> ResolverExpand for Resolver<'ra, 'tcx> { | |||
| target_trait.for_each_child(self, |this, ident, ns, _binding| { | |||
| // FIXME: Adjust hygiene for idents from globs, like for glob imports. | |||
| if let Some(overriding_keys) = this.impl_binding_keys.get(&impl_def_id) | |||
| && overriding_keys.contains(&BindingKey::new(ident.normalize_to_macros_2_0(), ns)) | |||
| && overriding_keys.contains(&BindingKey::new(ident, ns)) | |||
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Drive-by cleanup, the normalization already happens inside BindingKey::new.
oli-obk
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Disambiguators attached to underscore name bindings (like
const _: u8 = something;) do not need to be globally unique, they just need to be unique inside the module in which they live, because the bindings in a module are basically kept asMap<BindingKey, SomeData>.Also, the specific values of the disambiguators are not important, so a glob import of
const _may have a different disambiguator than the originalconst _itself.So in this PR the disambiguator is just set to the current number of bindings in the module.
This removes one more piece of global mutable state from resolver and unblocks #143884.