fix corner case in evaluate & reduce_vars (#4394)

fixes #4393
2020-12-17 23:16:04 +00:00
parent 4fa54b075c
commit 2c637fea8a
2 changed files with 24 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -426,6 +426,9 @@ merge(Compressor.prototype, {
                    }
                });
            };
+            if (scope.uses_arguments) scope.each_argname(function(node) {
+                node.definition().last_ref = false;
+            });
            if (compressor.option("ie8")) scope.variables.each(function(def) {
                var d = def.orig[0].definition();
                if (d !== def) d.fixed = false;
@@ -479,7 +482,7 @@ merge(Compressor.prototype, {

        function push_ref(def, ref) {
            def.references.push(ref);
-            def.last_ref = ref;
+            if (def.last_ref !== false) def.last_ref = ref;
        }

        function safe_to_read(tw, def) {