Removing tcast for tuples
问题 I'm in a bind with a goal equality like this (the details don't matter, I think): tcast tc0 [tuple of take i (s_bs bs) ++ drop i.+1 (s_bs bs) ++ [:: [ffun⇒ 0]]] = ... How do I get rid of the tcast and tuple to go back to simple seq (I tried the val_inj trick, but this didn't seem to remove the type cast)? Thanks in advance. Bye, Pierre 回答1: Giving a precise answer is a bit difficult, since you did not provide any reproducible testcase. But you could try rewriting your goal using the following