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-rw-r--r--src/libsyntax/feature_gate.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 2aa405bf6df..dbddd9dd44d 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -295,7 +295,7 @@ pub const KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType)] = &[
     ("recursion_limit", CrateLevel),
 ];
 
-#[derive(PartialEq, Copy, Debug)]
+#[derive(PartialEq, Copy, Clone, Debug)]
 pub enum AttributeType {
     /// Normal, builtin attribute that is consumed
     /// by the compiler before the unused_attribute check