Parse error when keyword adjacent to parenthesis

```python
handcrafted = [
# various ways to look like you're calling a keyword
'(_ if _ else _)in _',
'_ if _ else(lambda:_)',
'_ if(_ if _ else _) else _',
'_ if _ else(_ if _ else _)',
'def _(): return(lambda:_)',
'def _(): return(_ if _ else _)',
]
for s in handcrafted:
assert compiles(s), repr(s)
assert not libcst_native_parses(s), repr(s)
```

_Originally posted by @Zac-HD in https://github.com/Instagram/LibCST/issues/930#issuecomment-1581965630_