fix corner case in merge_vars (#4295)

fixes #4294
2020-11-18 01:32:53 +00:00
parent aff842f2f9
commit 7a51c17ff0
3 changed files with 35 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4750,6 +4750,8 @@ merge(Compressor.prototype, {
                        var ldef = node.variables.get(ref.name);
                        if (ldef && (ldef === def || def.undeclared || node.parent_scope.find_variable(ref) === def)) {
                            references[ldef.id] = false;
+                        } else {
+                            mark(ref, true, false);
                        }
                        return true;
                    });