1870.lean:12:2-12:35: error: type mismatch
  congrArg (@OfNat.ofNat Nat 0) (congrArg (@Zero.toOfNat0 Nat) ?_)
has type
  OfNat.ofNat 0 = OfNat.ofNat 0 : Prop
but is expected to have type
  OfNat.ofNat 0 = OfNat.ofNat 1 : Prop
1870.lean:16:2-16:16: error: tactic 'apply' failed, failed to unify
  ?f ?a₁ = ?f ?a₂
with
  OfNat.ofNat 0 = OfNat.ofNat 1
⊢ OfNat.ofNat 0 = OfNat.ofNat 1
1870.lean:21:2-21:16: error: tactic 'apply' failed, failed to unify
  ?f ?a₁ = ?f ?a₂
with
  OfNat.ofNat 0 = OfNat.ofNat 1
⊢ OfNat.ofNat 0 = OfNat.ofNat 1