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$\begingroup$ I’m not sure what you mean by “latter is not an inductive type”. Are you are saying that because product is a structure instead of an inductive type, that is the reason the termination checker fails. If so, I don’t think that is the reason. match works fine on structures as well as inductive types. I think it has more to do with the fact that you are matching on an inductive/structure type other than the inputs to the function. $\endgroup$
– Jason Rute
Commented Aug 30, 2023 at 14:47
$\begingroup$ You are right, indeed, thanks. I edited the answer $\endgroup$
– Meven Lennon-Bertrand ♦
Commented Aug 30, 2023 at 14:58
1

$\begingroup$ Thank you! Adding parens makes it a pair instead of... I don't don't what it's called. A simultaneous match pattern? $\endgroup$
– Nate Glenn
Commented Aug 30, 2023 at 22:33

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