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-rw-r--r--src/libsyntax_ext/concat_idents.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax_ext/concat_idents.rs b/src/libsyntax_ext/concat_idents.rs
index 3d5f32eadb3..09c23682cd7 100644
--- a/src/libsyntax_ext/concat_idents.rs
+++ b/src/libsyntax_ext/concat_idents.rs
@@ -17,7 +17,7 @@ use syntax::parse::token;
 use syntax::parse::token::str_to_ident;
 use syntax::ptr::P;
 
-pub fn expand_syntax_ext<'cx>(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree])
+pub fn expand_syntax_ext<'cx>(cx: &'cx mut ExtCtxt, sp: Span, tts: &[TokenTree])
                               -> Box<base::MacResult+'cx> {
     if !cx.ecfg.enable_concat_idents() {
         feature_gate::emit_feature_err(&cx.parse_sess.span_diagnostic,