non-syntactic-with-unscopables.js

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// Tests evaluate's supportUnscopables option.

function test(supportUnscopables) {

    var env = {x: 1, y: 2};

    Object.defineProperty(env, Symbol.unscopables, {get: function() {

        assertEq(supportUnscopables, true);

        return {x: false, y: true};

    }});

    evaluate(`this.gotX = x; try { this.gotY = y; } catch {}`,

             {envChainObject: env, supportUnscopables});

    assertEq(env.gotX, 1);

    assertEq(env.gotY, supportUnscopables ? undefined : 2);

test(false);

test(true);