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Let's say I want to declare a morphism instance on
fun x => f x y(f ^~ yin MC) for some binary functionfandy. Currently, HB complains:Canonical structures allow such instance declarations (cf. https://rocq-prover.org/doc/v9.2/refman/language/extensions/canonical.html#declaration-of-canonical-structures). So, this PR tries to relax the restriction on the HB side.
I'm unsure whether this small change suffices. I will test it with my real example and add a test case.