await-in-arrow-parameters.js

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var ieval = eval;

var AsyncFunction = async function(){}.constructor;

var functionContext = {

    Function: {

        constructor: Function,

        toSourceBody: code => `function f() { ${code} }`,

        toSourceParameter: code => `function f(x = ${code}) { }`,

},

    AsyncFunction: {

        constructor: AsyncFunction,

        toSourceBody: code => `async function f() { ${code} }`,

        toSourceParameter: code => `async function f(x = ${code}) { }`,

},

};

function assertSyntaxError(kind, code) {

    var {constructor, toSourceBody, toSourceParameter} = functionContext[kind];

    var body = toSourceBody(code);

    var parameter = toSourceParameter(code);

    assertThrowsInstanceOf(() => { constructor(code); }, SyntaxError, constructor.name + ":" + code);

    assertThrowsInstanceOf(() => { constructor(`x = ${code}`, ""); }, SyntaxError, constructor.name + ":" + code);

    assertThrowsInstanceOf(() => { eval(body); }, SyntaxError, "eval:" + body);

    assertThrowsInstanceOf(() => { ieval(body); }, SyntaxError, "indirect eval:" + body);

    assertThrowsInstanceOf(() => { eval(parameter); }, SyntaxError, "eval:" + parameter);

    assertThrowsInstanceOf(() => { ieval(parameter); }, SyntaxError, "indirect eval:" + parameter);

function assertNoSyntaxError(kind, code) {

    var {constructor, toSourceBody, toSourceParameter} = functionContext[kind];

    var body = toSourceBody(code);

    var parameter = toSourceParameter(code);

    constructor(code);

    constructor(`x = ${code}`, "");

    eval(body);

    ieval(body);

    eval(parameter);

    ieval(parameter);

function assertSyntaxErrorAsync(code) {

    assertNoSyntaxError("Function", code);

    assertSyntaxError("AsyncFunction", code);

function assertSyntaxErrorBoth(code) {

    assertSyntaxError("Function", code);

    assertSyntaxError("AsyncFunction", code);

// Bug 1353691

// |await| expression is invalid in arrow functions in async-context.

// |await/r/g| first parses as |AwaitExpression RegularExpressionLiteral|, when reparsing the

// arrow function, it is parsed as |IdentRef DIV IdentRef DIV IdentRef|. We need to ensure in this

// case, that we still treat |await| as a keyword and hence throw a SyntaxError.

assertSyntaxErrorAsync("(a = await/r/g) => {}");

assertSyntaxErrorBoth("async(a = await/r/g) => {}");

// Also applies when nesting arrow functions.

assertSyntaxErrorAsync("(a = (b = await/r/g) => {}) => {}");

assertSyntaxErrorBoth("async(a = (b = await/r/g) => {}) => {}");

assertSyntaxErrorBoth("(a = async(b = await/r/g) => {}) => {}");

assertSyntaxErrorBoth("async(a = async(b = await/r/g) => {}) => {}");

// Bug 1355860

// |await| cannot be used as rest-binding parameter in arrow functions in async-context.

assertSyntaxErrorAsync("(...await) => {}");

assertSyntaxErrorBoth("async(...await) => {}");

assertSyntaxErrorAsync("(a, ...await) => {}");

assertSyntaxErrorBoth("async(a, ...await) => {}");

// Also test nested arrow functions.

assertSyntaxErrorAsync("(a = (...await) => {}) => {}");

assertSyntaxErrorBoth("(a = async(...await) => {}) => {}");

assertSyntaxErrorBoth("async(a = (...await) => {}) => {}");

assertSyntaxErrorBoth("async(a = async(...await) => {}) => {}");

assertSyntaxErrorAsync("(a = (b, ...await) => {}) => {}");

assertSyntaxErrorBoth("(a = async(b, ...await) => {}) => {}");

assertSyntaxErrorBoth("async(a = (b, ...await) => {}) => {}");

assertSyntaxErrorBoth("async(a = async(b, ...await) => {}) => {}");

if (typeof reportCompare === "function")

    reportCompare(true, true);