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-rw-r--r--src/librustdoc/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index fe53439703a..58afd13f1a4 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -360,7 +360,7 @@ fn json_input(input: &str) -> Result<Output, String> {
         }
     };
     match json::from_reader(&mut input) {
-        Err(s) => Err(s.to_str().to_string()),
+        Err(s) => Err(s.to_str()),
         Ok(json::Object(obj)) => {
             let mut obj = obj;
             // Make sure the schema is what we expect