[issue27867] various issues due to misuse of PySlice_GetIndicesEx

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Good point Martin. I missed this because warnings are not emitted in non-debug build and were emitted only once in incremental debug build. Your idea about initializing slicelength in a macro LGTM.

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<http://bugs.python.org/issue27867>
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