doErrorMsg.lean:3:2: error: type mismatch
  IO.getStdin
has type
  EIO IO.Error IO.FS.Stream
but is expected to have type
  EIO IO.Error PUnit
doErrorMsg.lean:15:19: error: type mismatch
  f1
has type
  ExceptT String (StateT Nat Id) Nat
but is expected to have type
  ExceptT String (StateT Nat Id) String
doErrorMsg.lean:19:19: error: type mismatch
  f2 10
has type
  ExceptT String (StateT Nat Id) Nat
but is expected to have type
  ExceptT String (StateT Nat Id) String
doErrorMsg.lean:24:2: error: type mismatch
  f1
has type
  ExceptT String (StateT Nat Id) Nat
but is expected to have type
  ExceptT String (StateT Nat Id) String
doErrorMsg.lean:23:10: error: type mismatch
  f2
has type
  Nat → ExceptT String (StateT Nat Id) Nat
but is expected to have type
  ExceptT String (StateT Nat Id) ?m