755.lean:7:44-7:47: error: Type mismatch
  rfl
has type
  ?_ = ?_
but is expected to have type
  0 = 0
755.lean:26:2-26:5: error: Type mismatch
  rfl
has type
  ?_ = ?_
but is expected to have type
  2 * 3 = 2 * 3
755.lean:29:2-29:5: error: Type mismatch
  rfl
has type
  ?_ = ?_
but is expected to have type
  2 + 3 = 2 + 3
755.lean:32:2-32:5: error: Type mismatch
  rfl
has type
  ?_ = ?_
but is expected to have type
  2 - 3 = 2 - 3