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-rw-r--r--src/libsyntax/ext/deriving/generic/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/deriving/generic/mod.rs b/src/libsyntax/ext/deriving/generic/mod.rs
index 05269dbb44d..2b97687dbf8 100644
--- a/src/libsyntax/ext/deriving/generic/mod.rs
+++ b/src/libsyntax/ext/deriving/generic/mod.rs
@@ -1015,7 +1015,7 @@ impl<'a> TraitDef<'a> {
         to_set.expn_info = Some(box(GC) codemap::ExpnInfo {
             call_site: to_set,
             callee: codemap::NameAndSpan {
-                name: format!("deriving({})", trait_name).to_string(),
+                name: format!("deriving({})", trait_name),
                 format: codemap::MacroAttribute,
                 span: Some(self.span)
             }