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path: root/src/libsyntax/ext/deriving/show.rs
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-rw-r--r--src/libsyntax/ext/deriving/show.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/deriving/show.rs b/src/libsyntax/ext/deriving/show.rs
index eceac4e9a83..70d6da0f88b 100644
--- a/src/libsyntax/ext/deriving/show.rs
+++ b/src/libsyntax/ext/deriving/show.rs
@@ -127,7 +127,7 @@ fn show_substructure(cx: &mut ExtCtxt, span: Span,
     let formatter = substr.nonself_args[0].clone();
 
     let meth = cx.ident_of("write_fmt");
-    let s = token::intern_and_get_ident(format_string[]);
+    let s = token::intern_and_get_ident(format_string.index(&FullRange));
     let format_string = cx.expr_str(span, s);
 
     // phew, not our responsibility any more!