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Async generators don't accept unawaited return types #37602

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@falsandtru

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@falsandtru

TypeScript Version: 3.7.x-dev.20200324

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Code

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

Expected behavior:
pass
Actual behavior:
Type 'a' is not assignable to type 'awaited a'.ts(2322)
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