I have a l: List[Char] of characters which I want to concat and return as a String in one for loop.

I tried this

```
val x: String = for(i <- list) yield(i)

```

leading to 

```
 error: type mismatch;  
 found   : List[Char]  
 required: String

```

So how can I change the result type of yield?

Thanks!