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-rw-r--r--src/libstd/fmt/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/fmt/mod.rs b/src/libstd/fmt/mod.rs
index 4bee1f42b86..411f9f25459 100644
--- a/src/libstd/fmt/mod.rs
+++ b/src/libstd/fmt/mod.rs
@@ -691,7 +691,7 @@ pub fn format(args: &Arguments) -> ~str {
 pub unsafe fn format_unsafe(fmt: &[rt::Piece], args: &[Argument]) -> ~str {
     let mut output = MemWriter::new();
     write_unsafe(&mut output as &mut io::Writer, fmt, args);
-    return str::from_utf8_owned(output.unwrap());
+    return str::from_utf8_owned(output.unwrap()).unwrap();
 }
 
 impl<'a> Formatter<'a> {