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-rw-r--r--src/libsyntax/source_map.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/source_map.rs b/src/libsyntax/source_map.rs
index c65931a8577..8f91db8efa7 100644
--- a/src/libsyntax/source_map.rs
+++ b/src/libsyntax/source_map.rs
@@ -1030,7 +1030,7 @@ mod tests {
         cm.new_source_file(PathBuf::from("blork.rs").into(),
                        "first line.\nsecond line".to_string());
         cm.new_source_file(PathBuf::from("empty.rs").into(),
-                       "".to_string());
+                       String::new());
         cm.new_source_file(PathBuf::from("blork2.rs").into(),
                        "first line.\nsecond line".to_string());
         cm