dmd foreach loops throw exceptions on invalid UTF sequences, use replacementDchar instead

[ag0aep6g]

On 05.11.21 15:22, jfondren wrote:
> Looping over the dchar of a char[] requires one of
> 
> 1. throwing an error on invalid UTF (current behavior)
> 2. doing something else in that case (proposed: replacementDchar; also 
> possible: silently doing something invalid like iterating over three 
> dchars between "hello" and "there")
> 3. a compile-time error (also proposed in the thread)

4. Don't decode. Just do an implicit conversion from char to dchar. Just 
like `char c; dchar d = c;`. It's horrible, but D usually allows it. So 
let foreach do it too.

But I'd rather get an error (i.e. #3). And disallow the implicit 
conversion as well while you're at it.