Type 'AsyncGenerator<awaited a, awaited a, unknown>' is not assignable to type 'AsyncGenerator<a, a, unknown>'. #37603

TypeScript Version: 3.7.x-dev.20200324

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Code

function g<a>(a: a): AsyncGenerator<a, a> {
  return async function* (): AsyncGenerator<awaited a, awaited a> {
    yield a;
    return a;
  }();
}

Expected behavior:
pass
Actual behavior:
Type 'AsyncGenerator<awaited a, awaited a, unknown>' is not assignable to type 'AsyncGenerator<a, a, unknown>'.
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