fix corner case in arguments (#4293)

fixes #4291
2020-11-18 00:54:58 +00:00
parent 0bedd031da
commit aff842f2f9
3 changed files with 27 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -9575,7 +9575,8 @@ merge(Compressor.prototype, {
            && expr instanceof AST_SymbolRef
            && is_arguments(def = expr.definition())
            && prop instanceof AST_Number
-            && (fn = expr.scope.resolve()) === find_lambda()) {
+            && (fn = expr.scope.resolve()) === find_lambda()
+            && fn.uses_arguments !== "d") {
            var index = prop.value;
            if (parent instanceof AST_UnaryPrefix && parent.operator == "delete") {
                if (!def.deleted) def.deleted = [];