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-rw-r--r--src/librustc_errors/emitter.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_errors/emitter.rs b/src/librustc_errors/emitter.rs
index cc71a299a73..0e384567846 100644
--- a/src/librustc_errors/emitter.rs
+++ b/src/librustc_errors/emitter.rs
@@ -1655,7 +1655,7 @@ impl FileWithAnnotatedLines {
                                   line_index: usize,
                                   ann: Annotation) {
 
-            for slot in file_vec.iter_mut() {
+            for slot in file_vec {
                 // Look through each of our files for the one we're adding to
                 if slot.file.name == file.name {
                     // See if we already have a line for it