Control flow of immediately invoked generator function should not be inlined

[ajafff]

TypeScript Version: 2.8.1

Search Terms:

Code

// --strict
function test() {
    let v: number;
    (function*() {
        yield 1;
        v = 1;
    })();
    v; // still undefined
}

Expected behavior:
Error Variable 'v' is used before being assigned.

Actual behavior:
No error, but v is still undefined at runtime.

I noticed this while looking through the code in binder.ts where it says that all non-async IIFEs are inlined. Note that adding the async modifier to the generator function brings up the expected error.

Playground Link: https://agentcooper.github.io/typescript-play/#code/GYVwdgxgLglg9mABFApgZygCgJSIN4BQixiANilIgG4BciYIAtgEYoBOA3ESZqJLAgBUOfNxIkAnjBSkAJogCMXceKqIAvIuUkAvthzbiVDogD0pxBhilSicLJTAYYFLII6CQA

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