Adapt to coq#pr19611 #45
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Thanks. I'll take a look at this on Monday, after the holidays in Spain. The reason for hacking Ordered the way it is, is because some of our development that imports the fcsl-pcm repo, requires a specific universe for Ordered. I think the right way to fix this may be to consider adding universe polymorphism related annotations to HB. |
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Due to the way
Orderedis declared (and probably because of universe polymorphism), the unification algorithm "fails" on problems of the formOrdered.sort A = Ordered.sort ?Abecause the universe instances ofOrdered.sortdo not match. This issue is hidden by the canonical structure resolution procedure, but the new algorithm in coq/coq#19611 (purposefully) changes the inferred structure fromAtostructures_eta__canonical__ordtype_Ordered A, which is not unifiable toAand breaks a few things. This PR adds a few annotations to get the correct structure back.N.B. The whole repository compiles with the commented declaration of
Orderedvia HB (also tested on coq-8.19), so I am confused as to why it was necessary to declare it by hand. Restoring the HB declaration would be a much cleaner way to solve the issue, if possible.