@Fn.imp ((p : P) → Bar.fn p) ({p : P} → Bar.fn p) fn : {p : P} → Bar.fn p
439.lean:18:7-18:12: error: function expected at
  fn.imp
term has type
  Bar.fn ?m
439.lean:29:7-29:11: error: function expected at
  fn.imp
term has type
  Bar.fn ?m
fn.imp : Bar.fn p
fn'.imp Bp : Bar.fn p
439.lean:39:11-39:12: error: application type mismatch
  fn'.imp p
argument
  p
has type
  P : Sort u
but is expected to have type
  Bar.fn ?m : Sort ?u
fn'.imp (sorryAx (Bar.fn ?m) true) : Bar.fn ?m