src/third_party/mozjs-45/js/src/jit-test/tests/collections/WeakMap-constructor-nonnull.js

// WeakMap constructor should throw when key is nonnull.

load(libdir + "asserts.js");

var v1 = 42;

var primitive = 10;
assertThrowsInstanceOf(() => new WeakMap([[primitive, v1]]), TypeError);

var empty_array = [];
assertThrowsInstanceOf(() => new WeakMap([empty_array]), TypeError);