bjoernager/rust
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Auto merge of #78826 - petrochenkov:mrscopes2, r=eddyb

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resolve: Collapse `macro_rules` scope chains on the fly

Otherwise they grow too long and you have to endlessly walk through them when resolving macros or imports.
Addresses https://rust-lang.zulipchat.com/#narrow/stream/247081-t-compiler.2Fperformance/topic/Slow.20Builtin.20Derives/near/215750815
This commit is contained in:
bors 2020-11-13 05:40:37 +00:00
commit a38f8fb674
6 changed files with 70 additions and 30 deletions
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2
compiler/rustc_resolve/src/diagnostics.rs
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@ -630,7 +630,7 @@ impl<'a> Resolver<'a> {
}
}
Scope::MacroRules(macro_rules_scope) => {
if let MacroRulesScope::Binding(macro_rules_binding) = macro_rules_scope {
if let MacroRulesScope::Binding(macro_rules_binding) = macro_rules_scope.get() {
let res = macro_rules_binding.binding.res();
if filter_fn(res) {
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