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-rw-r--r--compiler/rustc_builtin_macros/src/assert.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_builtin_macros/src/assert.rs b/compiler/rustc_builtin_macros/src/assert.rs
index 8fa3fe5b3e6..501d557f3ab 100644
--- a/compiler/rustc_builtin_macros/src/assert.rs
+++ b/compiler/rustc_builtin_macros/src/assert.rs
@@ -22,7 +22,7 @@ pub fn expand_assert<'cx>(
 ) -> Box<dyn MacResult + 'cx> {
     let Assert { cond_expr, custom_message } = match parse_assert(cx, span, tts) {
         Ok(assert) => assert,
-        Err(mut err) => {
+        Err(err) => {
             err.emit();
             return DummyResult::any(span);
         }