unexpected code generated with class expression

[vvakame]

tested on 690b87c

source code.

new class {
    hi() {
        return "Hi!";
    }
}().hi();

expected.

new ((function () {
    function class_1() {
    }
    class_1.prototype.hi = function () {
        return "Hi!";
    };
    return class_1;
})())().hi();

actual.

new (function () {
    function class_1() {
    }
    class_1.prototype.hi = function () {
        return "Hi!";
    };
    return class_1;
})()().hi();

$ tsc --target es5 test.ts
$ node test.js
/private/tmp/tsc-1.6/test.js:8
})()().hi();
      ^

TypeError: Cannot read property 'hi' of undefined
    at Object.<anonymous> (/private/tmp/tsc-1.6/test.js:8:7)
    at Module._compile (module.js:430:26)
    at Object.Module._extensions..js (module.js:448:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:471:10)
    at startup (node.js:117:18)
    at node.js:951:3

[mhegazy]

that is similar to function expressions (#4472). i will need to double check the ES6 grammar to be sure though.

[mhegazy]

@DanielRosenwasser can you take a look.

[vladima]

absence of parens effectively make generated code looks like this:

var x = new (function () {
    function class_1() {
    }
    class_1.prototype.hi = function () {
        return "Hi!";
    };
    return class_1;
})()

x().hi();

[mhegazy]

my bad. we should parenthesize the output.