michael@0: load(libdir + "asserts.js");
michael@0: 
michael@0: assertThrowsInstanceOf(function () {
michael@0:     eval("function x() { 'use strict'; const x = 4; x = 3; }");
michael@0: }, TypeError);
michael@0: assertThrowsInstanceOf(function () {
michael@0:     Function("'use strict'; const x = x = 5;");
michael@0: }, TypeError)