(Should 'code' be cast to the right pointer type?)

to an unsigned int (and back again) on 64-bit machines, even though the
actual value of the Py_ssize_t variable is way below 31 bits. I suspect
compiler-error.

The culprit was an expression-less yield -- the first apparently in
the standard library.  I added a unit test for this.
Also removed the hack to force compilation of test_with.py.

convince gcc (4.0.x) the variables are never used uninitialized (and raising
a proper exception if they ever are.)

(PyMarshal_ReadShortFromFile() is only used in zipimport.c, I don't believe
the extra initializations will matter one way or another.)

everywhere else?)

the sentinel value in the main function, rather than the helper. This
function could possibly do with an early-out if any of the helper calls ends
up with a len of 0, but I doubt it really matters (how common are malformed
hangul syllables, really?)

exception, it should not be propagated up.  With unit tests.