fix corner case with arguments (#4486)

fixes #4485
2020-12-31 06:55:05 +00:00
parent 8b954b022b
commit 0b7d65d331
3 changed files with 176 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3344,7 +3344,9 @@ merge(Compressor.prototype, {
            if (is_undeclared_ref(this) && this.is_declared(compressor)) return false;
            if (this.is_immutable()) return false;
            var def = this.definition();
-            if (is_arguments(def)) return def.scope.uses_arguments > 2;
+            if (is_arguments(def) && all(def.scope.argnames, function(argname) {
+                return argname instanceof AST_SymbolFunarg;
+            })) return def.scope.uses_arguments > 2;
            var fixed = this.fixed_value();
            if (!fixed) return true;
            this._dot_throw = return_true;