fix corner case in reduce_vars & unused (#4414)

fixes #4413
2020-12-19 12:47:46 +08:00
parent e6dd471f8f
commit 9a5aede941
2 changed files with 20 additions and 0 deletions
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -257,6 +257,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
                sym = self.def_global(node);
            } else if (name == "arguments"
                && sym.orig[0] instanceof AST_SymbolFunarg
+                && !(sym.orig[1] instanceof AST_SymbolFunarg)
                && !(sym.scope instanceof AST_Arrow)) {
                var parent = tw.parent();
                if (parent instanceof AST_Assign && parent.left === node