src/third_party/mozjs-45/js/src/jit-test/tests/debug/Environment-names-01.js

// env.names() lists nonenumerable names in with-statement environments.

var g = newGlobal();
var dbg = Debugger(g);
var hits = 0;
g.h = function () {
    var env = dbg.getNewestFrame().environment;
    var names = env.names();
    assertEq(names.indexOf("a") !== -1, true);

    // FIXME: Bug 748592 - proxies don't correctly propagate JSITER_HIDDEN
    //assertEq(names.indexOf("b") !== -1, true);
    //assertEq(names.indexOf("isPrototypeOf") !== -1, true);
    hits++;
};
g.eval("var obj = {a: 1};\n" +
       "Object.defineProperty(obj, 'b', {value: 2});\n" +
       "with (obj) h();");
assertEq(hits, 1);