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-rw-r--r--src/emitter/diff.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emitter/diff.rs b/src/emitter/diff.rs
index 5e387395b5b..08a42b4679d 100644
--- a/src/emitter/diff.rs
+++ b/src/emitter/diff.rs
@@ -14,7 +14,7 @@ impl DiffEmitter {
 
 impl Emitter for DiffEmitter {
     fn emit_formatted_file(
-        &self,
+        &mut self,
         _output: &mut dyn Write,
         FormattedFile {
             filename,