c42e64099b80e112eb0b172801a7107e143f78dc
My current reading of the relevant static functions suggests that last is never used without being uninitialized, (we only use it if the expansion function returned non-NULL and the expansion functions always set it before returning non-NULL). Apparently gcc isn't coming to the same conclusion. Initializing this to NULL nicely quites gcc and will guarantee a nice, early segfault if my anaylsis turns out to be wrong.
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