memoryview(ctypes.Structure) does not produce the correct format string

Issue #2930 new
created an issue

The following passes on CPython, fails on PyPy (mv.format is B)

class Struct(Structure):
    _fields_ = [('a', c_int16)]

Struct3 = 3 * Struct

c_array = (2 * Struct3)(
    Struct3(Struct(a=1), Struct(a=2), Struct(a=3)),
    Struct3(Struct(a=4), Struct(a=5), Struct(a=6))

mv = memoryview(c_array)
assert mv.format == 'T{<h:a:}'

The memoryview call goes to _CData.__buffer__ in, which should not just call buffer(self._buffer)

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