es6-syntax.js - mozsearch

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// Test interactions between ES6 generators and not-yet-standard

// features.

function assertSyntaxError(str) {

    var msg;

    var evil = eval;

    try {

        // Non-direct eval.

        evil(str);

    } catch (exc) {

        if (exc instanceof SyntaxError)

            return;

        msg = "Assertion failed: expected SyntaxError, got " + exc;

    if (msg === undefined)

        msg = "Assertion failed: expected SyntaxError, but no exception thrown";

    throw new Error(msg + " - " + str);

// Destructuring binding.

assertSyntaxError("function* f(x = yield) {}");

assertSyntaxError("function* f(x = yield 17) {}");

assertSyntaxError("function* f([yield]) {}");

assertSyntaxError("function* f({ yield }) {}");

assertSyntaxError("function* f(...yield) {}");

// For each.

assertSyntaxError("for yield");

assertSyntaxError("for yield (;;) {}");

assertSyntaxError("for yield (x of y) {}");

assertSyntaxError("for yield (var i in o) {}");

// Expression bodies.

assertSyntaxError("function* f() yield 7");