fix corner case in collapse_vars (#5310)

fixes #5309
2022-01-23 00:45:11 +08:00
parent 866cd4a975
commit b46c7944c6
2 changed files with 37 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2119,7 +2119,8 @@ Compressor.prototype.compress = function(node) {
                        var parent = multi_replacer.parent();
                        if (parent instanceof AST_Sequence && parent.tail_node() !== node) {
                            value_def.replaced++;
-                            return List.skip;
+                            if (rvalue === rhs_value) return List.skip;
+                            return make_sequence(rhs_value, rhs_value.expressions.slice(0, -1));
                        }
                        return rvalue;
                      case 1: