pointer(.) of struct array causes CPython to yield error, "Type dtype('O') not implemented"

[dylon]

If I pass an array of structs to pointer, it fails with the error, "NotImplementedError: Type dtype('O') not implemented"

from lpython import CPtr, c_p_pointer, p_c_pointer, dataclass, empty_c_void_p, pointer

from numpy import empty

@dataclass
class Foo:
 pass

def main() -> None:
 foos: Foo[1] = empty(1, dtype=Foo)
 pointer(foos)

main()

$ python /var/tmp/main.py
Traceback (most recent call last):
 File "/var/tmp/main.py", line 13, in <module>
 main()
 File "/var/tmp/main.py", line 11, in main
 pointer(foos)
 File "/home/dylon/Workspace/lpython/src/runtime/lpython/lpython.py", line 446, in pointer
 return x.ctypes.data_as(ctypes.POINTER(convert_numpy_dtype_to_ctype(x.dtype)))
 File "/home/dylon/Workspace/lpython/src/runtime/lpython/lpython.py", line 291, in convert_numpy_dtype_to_ctype
 raise NotImplementedError("Type %r not implemented" % arg)
NotImplementedError: Type dtype('O') not implemented

A solution seems to be to add the dtype to convert_numpy_dtype_to_ctype:

elif arg == np.void or arg == np.dtype('O'):
 return ctypes.c_void_p

[czgdp1807]

Explained in #1814 (comment) and #1822 (comment)