('a', 98): (Char, Char) fails type checking the _2

``` scala
dotty> ('a', 98): (Char, Char) 
     ^
('a', 98): (Char, Char)
<console>:5: error: type mismatch:
 found   : Int(98)
 required: T2
```

``` scala
scalac> ('a', 98): (Char, Char) 
res4: (Char, Char) = (a,b)
```
