fix corner case in ie8 & reduce_vars (#3919)

fixes #3918
2020-05-22 02:56:35 +01:00
parent fa14a9cfcd
commit 75c5b6029b
2 changed files with 35 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7515,6 +7515,8 @@ merge(Compressor.prototype, {
                                scope.inlined = true;
                            } while (scope = scope.parent_scope);
                        }
+                    } else if (compressor.option("ie8") && fixed.name && def !== fixed.name.definition()) {
+                        single_use = false;
                    }
                    if (single_use) fixed.parent_scope = self.scope;
                } else if (!fixed || !fixed.is_constant_expression()) {