inspect.isgenerator is broken

[smurfix]

This doesn't quite match what I'd expect.

MicroPython v1.24.0-400.g160c2931f.dirty on 2025-04-10; linux [GCC 14.2.0] version
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>>> async def fn():
...     pass
...
>>> x=fn()
>>> inspect.isgeneratorfunction(x)
False  ## correct
>>> inspect.isgenerator(x)
False  ## wrong
>>> x
<generator object 'fn' at 7f5b2a9534a0>
>>> inspect.isgeneratorfunction(fn)
True  ## correct
>>> inspect.isgenerator(fn)
True  ## wrong
>>> 

[smurfix]

Fix:

def isgenerator(obj):
    return isinstance(obj, type((lambda: (yield))()))

Note the additional parentheses.

[dpgeorge]

Yes, you're quite right, it's missing those parenthesis.

See #998 for a fix.