fix corner case in `reduce_vars` (#3124)

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/compress.js b/lib/compress.js
index bdce24bc..03fb1c11 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -383,7 +383,15 @@ merge(Compressor.prototype, {
         }
 
         function mark_defun(tw, def) {
-            if (def.id in tw.defun_ids) return def.fixed;
+            if (def.id in tw.defun_ids) {
+                var marker = tw.defun_ids[def.id];
+                if (!marker) return;
+                if (marker !== tw.safe_ids) {
+                    tw.defun_ids[def.id] = undefined;
+                    return;
+                }
+                return def.fixed;
+            }
             if (!tw.in_loop) {
                 tw.defun_ids[def.id] = tw.safe_ids;
                 return def.fixed;