1836.lean:12:2: error: cases tactic failed, when eliminating equality right-hand-side depends on left-hand-side
state:
A : pType,
B : Type,
b : B,
f : A.carrier → {carrier := B, Point := b}.carrier,
pf : f (A.Point) = {carrier := B, Point := b}.Point
⊢ b = f (A.Point) → pf == _ → {f := f, p := pf} = {f := f, p := pf}