cases_tac.lean:7:2: proof state
A : Type,
B : A → Type,
a : A,
Hb : B a
⊢ A
cases_tac.lean:17:2: proof state
A : Type,
B : A → Type,
f : A → A,
a : A,
Hc : a = a,
Hb : foo₂.mk (f a) a = foo₂.mk (f a) a
⊢ A