cases_tac.lean:7:2: proof state
A : Type,
B : A → Type,
a_1 : A,
Hb : B a_1
⊢ A
cases_tac.lean:17:2: proof state
A : Type,
B : A → Type,
f : A → A,
d : A,
Hc : d = d,
Hb : foo₂.mk (f d) d = foo₂.mk (f d) d
⊢ A