5cf5f5024d
The logic for how the "returns" constraint was handled was always dodgy, for reasons explained in the comments I added to auxiliary::fn_info in this commit. Fixed it by adding distinct "returns" and "diverges" constraints for each function, which are both handled positively (that is: for a ! function, the "diverges" constraint must be true on every exit path; for any other function, the "returns" constraint must be true on every exit path). Closes #779
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