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-rw-r--r--src/libstd/json.rs6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/libstd/json.rs b/src/libstd/json.rs
index 5d9427c72b8..1ccdc5042dd 100644
--- a/src/libstd/json.rs
+++ b/src/libstd/json.rs
@@ -603,6 +603,12 @@ impl of to_str::to_str for json {
     fn to_str() -> str { to_str(self) }
 }
 
+impl of to_str::to_str for error {
+    fn to_str() -> str {
+        #fmt("%u:%u: %s", self.line, self.col, self.msg)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     fn mk_dict(items: [(str, json)]) -> json {