pstate.lean:4:26: error: don't know how to synthesize placeholder
A : Type,
a b c : A,
h₁ : a = b,
h₂ : b = c
⊢ b = c
pstate.lean:4:7: error: failed to add declaration 'foo' to environment, value has metavariables
remark: set 'formatter.hide_full_terms' to false to see the complete term
  λ (A : Type) (a b c : A) (h₁ : …) (h₂ : …),
    eq.trans h₁ ?M_1