Better Coq 8.6 compatibility
With Coq 8.6, you can no longer have intro patterns that give more names than the constructor has. Also, patterns with too few names are now interpreted as filling up with "?", rather than putting the unnamed parts into the goal again. Furthermore, it seems the behavior of "simplify_eq/=" changed, I guess hypotheses are considered in different order now. I managed to work around this, but it all seem kind of fragile. The next compilation failure is an "Anyomaly: ... Please report", so that's what I will do.
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