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-rw-r--r--src/libsyntax/ext/mtwt.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libsyntax/ext/mtwt.rs b/src/libsyntax/ext/mtwt.rs
index 6ba90bbebed..48120b575ac 100644
--- a/src/libsyntax/ext/mtwt.rs
+++ b/src/libsyntax/ext/mtwt.rs
@@ -56,6 +56,8 @@ pub enum SyntaxContext_ {
     IllegalCtxt
 }
 
+impl Copy for SyntaxContext_ {}
+
 /// A list of ident->name renamings
 pub type RenameList = Vec<(Ident, Name)>;