fix corner case in `arguments` (#4387)

fixes #4386
0 files changed, 0 insertions, 0 deletions
diff --git a/lib/compress.js b/lib/compress.js
index b767264c..a46cd42b 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -9843,6 +9843,8 @@ merge(Compressor.prototype, {
             var argname = fn.argnames[index];
             if (def.deleted && def.deleted[index]) {
                 argname = null;
+            } else if (argname instanceof AST_Destructured) {
+                argname = null;
             } else if (argname && (compressor.has_directive("use strict")
                 || !(fn_parent instanceof AST_Call && index < fn_parent.args.length))) {
                 var arg_def = argname.definition();