fix corner case in arguments (#4387)

fixes #4386

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();

test/compress/destructured.js

@@ -1866,3 +1866,23 @@ issue_4383: {
     expect_stdout: "1"
     node_version: ">=6"
 }
+
+issue_4386: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        function f({}) {
+            return arguments[0];
+        }
+        console.log(f("PASS"));
+    }
+    expect: {
+        function f({}) {
+            return arguments[0];
+        }
+        console.log(f("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}