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Remove unnecessary allocation.

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This commit is contained in:
jumbatm 2020-12-23 00:26:04 +10:00
parent 15c64a181b
commit 7a46a4f219
1 changed files with 4 additions and 4 deletions
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8
compiler/rustc_lint/src/builtin.rs
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@ -2630,14 +2630,14 @@ impl ClashingExternDeclarations {
let local_did = tcx.hir().local_def_id(fi.hir_id);
let did = local_did.to_def_id();
let instance = Instance::new(did, ty::List::identity_for_item(tcx, did));
let name = tcx.symbol_name(instance).name.to_string();
if self.seen_decls.contains_key(&name) {
let name = tcx.symbol_name(instance).name;
if let Some(&hir_id) = self.seen_decls.get(name) {
// Avoid updating the map with the new entry when we do find a collision. We want to
// make sure we're always pointing to the first definition as the previous declaration.
// This lets us avoid emitting "knock-on" diagnostics.
Some(*self.seen_decls.get(&name).unwrap())
Some(hir_id)
} else {
self.seen_decls.insert(name, hid)
self.seen_decls.insert(name.to_owned(), hid)
}
}