parsers: avoid PySliceObject cast on Python 3
PySlice_GetIndicesEx() accepts a PySliceObject* on Python 2 and a
PyObject* on Python 3. Casting to PySliceObject* on Python 3 was
yielding a compiler warning. So stop doing that.
With this patch, I no longer see any compiler warnings when
building the core extensions for Python 3!
--- a/mercurial/parsers.c Thu Oct 13 13:27:14 2016 +0200
+++ b/mercurial/parsers.c Thu Oct 13 13:34:53 2016 +0200
@@ -2276,7 +2276,12 @@
Py_ssize_t length = index_length(self);
int ret = 0;
+/* Argument changed from PySliceObject* to PyObject* in Python 3. */
+#ifdef IS_PY3K
+ if (PySlice_GetIndicesEx(item, length,
+#else
if (PySlice_GetIndicesEx((PySliceObject*)item, length,
+#endif
&start, &stop, &step, &slicelength) < 0)
return -1;