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-rw-r--r--src/libsyntax/ext/format.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index c05fc8ce6d9..0d228a1146d 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -21,7 +21,7 @@ use rsparse = parse;
 use parse = fmt_macros;
 use collections::{HashMap, HashSet};
 
-#[deriving(Eq)]
+#[deriving(PartialEq)]
 enum ArgumentType {
     Known(String),
     Unsigned,