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-rw-r--r--compiler/rustc_parse/src/validate_attr.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_parse/src/validate_attr.rs b/compiler/rustc_parse/src/validate_attr.rs
index a12215a44f9..646e996ff30 100644
--- a/compiler/rustc_parse/src/validate_attr.rs
+++ b/compiler/rustc_parse/src/validate_attr.rs
@@ -291,6 +291,7 @@ fn emit_malformed_attribute(
             | sym::repr
             | sym::align
             | sym::deprecated
+            | sym::optimize
     ) {
         return;
     }