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-rw-r--r--compiler/rustc_mir/src/const_eval/eval_queries.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_mir/src/const_eval/eval_queries.rs b/compiler/rustc_mir/src/const_eval/eval_queries.rs
index de898460368..62c314d90f5 100644
--- a/compiler/rustc_mir/src/const_eval/eval_queries.rs
+++ b/compiler/rustc_mir/src/const_eval/eval_queries.rs
@@ -50,7 +50,7 @@ fn eval_body_using_ecx<'mir, 'tcx>(
 
     let name =
         with_no_trimmed_paths(|| ty::tls::with(|tcx| tcx.def_path_str(cid.instance.def_id())));
-    let prom = cid.promoted.map_or(String::new(), |p| format!("::promoted[{:?}]", p));
+    let prom = cid.promoted.map_or_else(|| String::new(), |p| format!("::promoted[{:?}]", p));
     trace!("eval_body_using_ecx: pushing stack frame for global: {}{}", name, prom);
 
     ecx.push_stack_frame(