future_safe & RuntimeWarning: coroutine '...' was never awaited

从 FutureResultE.from_iterable 和 issue 中的最小示例开始，然后检查出现警告的 returns/_generated/futures/_future_result.py:44 和 returns/future.py:594。使用 Python 3.7 和失败的 timeout 示例进行复现；当预期的 Failure 仍然存在，同时不再出现 unawaited-coroutine RuntimeWarnings 时，即表示完成。

Hi!
I'm running sample code from https://returns.readthedocs.io/en/latest/pages/future.html#futureresult on python3.7
I've set timeout for AsyncClient to 0.01, expecting the function to always fail. That works correct, the result is <IOResult: <Failure: >>
But there are lots of RuntimeWarnings:

/.../returns/_generated/futures/_future_result.py:44: RuntimeWarning: coroutine 'async_map' was never awaited
  container = await inner_value
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
/.../returns/_generated/futures/_future_result.py:44: RuntimeWarning: coroutine 'future_safe.<locals>.factory' was never awaited
  container = await inner_value
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
/.../future.py:594: RuntimeWarning: coroutine 'async_map' was never awaited
  return IOResult.from_result(await self._inner_value)
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
/.../returns/future.py:594: RuntimeWarning: coroutine 'future_safe.<locals>.factory' was never awaited
  return IOResult.from_result(await self._inner_value)
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

It is not a good idea to disable RuntimeWarnings, and i suspect this behaviour to be incorrect.

I think that the problem is inside the FutureResultE.from_iterable, the minimal working example is like this:

@future_safe
async def f1(x: float) -> float:
    return x / 0

def f2() -> FutureResultE[Sequence[float]]:
    return FutureResultE.from_iterable(
        # changing range(3) -> range(1) removes RuntimeWarnings
        [f1(x).map(lambda k: k + 1) for x in range(3)]
    )

print(anyio.run(f2().awaitable))