fix corner case in unused (#4925)

fixes #4924
2021-05-11 13:50:58 +01:00
parent 7eef86ed05
commit ae51f76ba7
2 changed files with 46 additions and 3 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7415,9 +7415,7 @@ merge(Compressor.prototype, {
            }
            if (left.has_side_effects(compressor)) return this;
            var right = this.right;
-            if (lazy_op[this.operator.slice(0, -1)]) {
-                this.write_only = !right.has_side_effects(compressor);
-            } else {
+            if (!lazy_op[this.operator.slice(0, -1)]) {
                this.write_only = true;
                if (root_expr(left).is_constant_expression(compressor.find_parent(AST_Scope))) {
                    return right.drop_side_effect_free(compressor);