ite ↑tt "a" "b" : string
sine x : real
sine ↑n : real
sine ↑i : real
x + ↑i : real
coe1.lean:28:9: error: type mismatch at application
  i + x
term
  x
has type
  real
but is expected to have type
  int
↑i + x : real
x + ↑n : real
coe1.lean:35:9: error: type mismatch at application
  n + x
term
  x
has type
  real
but is expected to have type
  ℕ
↑n + x : real
↑i + x : real
↑n + x : real