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Thanks.  It looks like it's not happy with the alignment of
a pointer to double; in particular, it's in Number.__repr__
in function complexes(). I'm assuming that on your
architecture:

- sizeof(long) == 4
- a double requires 8-byte alignment

Then I believe I have a fix. Can you try this:

In Include/objimpl.h, in the structure PyGC_Head, after "int
gc_refs;" (line 272), insert another -- dummy -- int field,
e.g. "int dummy;".

Then recompile and re-run the test.

If this fixes the problem, I have some work to do, but it
would confirm my theory (that the alignment is botched
because the GC header moves the structure up 12 bytes).