fix corner case in assignments (#5426)

fixes #5425
2022-04-19 13:19:30 +08:00
parent fbdb7eeda3
commit a0c0c294c5
2 changed files with 31 additions and 3 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -11139,9 +11139,15 @@ Compressor.prototype.compress = function(node) {
                && assign instanceof AST_Assign
                && assign.operator == "="
                && self.left.equivalent_to(assign.left)) {
-                self.right = assign.right;
-                assign.right = self;
-                return assign;
+                return make_node(AST_Assign, self, {
+                    operator: "=",
+                    left: assign.left,
+                    right: make_node(AST_Binary, self, {
+                        operator: self.operator,
+                        left: self.left,
+                        right: assign.right,
+                    }),
+                }).optimize(compressor);
            }
        }
        if (compressor.option("comparisons")) switch (self.operator) {