decoding foreach

[Timon Gehr via Digitalmars-d]

On 02.06.2016 12:38, deadalnix wrote:


This, deep down, point at the fact that conversion from/to char types
are ill defined.

One should be able to convert from char to byte/ubyte but not the other
way around.
One should be able to convert from byte to short but not from char to
wchar.

Once you disable the naive conversions, then the autodecoding in foreach
isn't inconsistent anymore.

The current situation is bad:

void main(){
    import std.utf,std.stdio;
    foreach(dchar d;"∑")
        writeln(d); // "∑"
    foreach(dchar d;"∑".byCodeUnit)
        writeln(d); // "â", "ˆ\210", "\221‘"
}

Implicit conversion should not happen, and I'd prefer both of them to 
behave the same. (I.e. make both a compile-time error or decode for both).