fix corner cases in sequences (#4690)

fixes #4689
2021-02-25 04:48:40 +00:00
parent 822b1da5d2
commit 6d7ab63a66
3 changed files with 41 additions and 3 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3118,7 +3118,7 @@ merge(Compressor.prototype, {
                            }
                        }
                    } else if (stat instanceof AST_ForIn) {
-                        stat.object = cons_seq(stat.object);
+                        if (!is_lexical_definition(stat.init)) stat.object = cons_seq(stat.object);
                    } else if (stat instanceof AST_If) {
                        stat.condition = cons_seq(stat.condition);
                    } else if (stat instanceof AST_Switch) {