Incorrect print of function under unary operator

(In uncurried mode, which is now always true).

This

```res
!(arg => doStuffWith(arg))
```

formats to 

```res
!arg => doStuffWith(arg)
```

which does not parse.

Also, this:
```res
let x = (x => print(x)).x
```

formats to

```res
let x = x => print(x).x
```