[cairo-bugs] [Bug 83295] difference of non negative enums is never negative

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83295

--- Comment #2 from Massimo <sixtysix at inwind.it> ---
(In reply to comment #1)
> But that is not equivalent. The equivalent assert would be
> assert((int)(a->type - b->type) >= 0);

but that means that you are assigning/converting UINT_MAX - 1 or 2
to an int and gcc knows it cannot happen and I think after 
inlining and only checking the sign of the int gcc translates it
to a->type != b->type

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