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Auto merge of #78508 - wesleywiser:optimize_visit_scopes, r=petrochenkov

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[resolve] Use `unwrap_or_else` instead of `unwrap_or` in a hot path

This improves the performance of the `resolve_crate` function by 30% for
a very large single file crate with auto-generated C bindings.

cc `@rylev`
This commit is contained in:
bors 2020-10-29 18:34:59 +00:00
commit 6bdae9edd0
1 changed files with 3 additions and 4 deletions
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7
compiler/rustc_resolve/src/lib.rs
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@ -1725,10 +1725,9 @@ impl<'a> Resolver<'a> {
Scope::MacroRules(binding.parent_macro_rules_scope)
}
MacroRulesScope::Invocation(invoc_id) => Scope::MacroRules(
self.output_macro_rules_scopes
.get(&invoc_id)
.cloned()
.unwrap_or(self.invocation_parent_scopes[&invoc_id].macro_rules),
self.output_macro_rules_scopes.get(&invoc_id).cloned().unwrap_or_else(
|| self.invocation_parent_scopes[&invoc_id].macro_rules,
),
),
MacroRulesScope::Empty => Scope::Module(module),
},