Josh Rosenberg added the comment:
Note: Uncommenting the line that forces Py_TPFLAGS_HEAPTYPE isn't enough, since
it looks like the PyHeapTypeObject fields aren't initialized properly, causing
seg faults if you access, for example, __name__/__qualname__ (or print the
type's repr, which implicitly accesses same):
python -c "import testnewtype; Foo = testnewtype.makeseq('Foo', ['x',
'y']); print(Foo.__name__)"
The type behaves properly otherwise (you can make instances, access values on
them), but crashing on repr is probably poor form. :-)
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<http://bugs.python.org/issue28709>
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