Updating D beyond Unicode 2.0

[Patrick Schluter]

On Monday, 24 September 2018 at 13:26:14 UTC, Steven 
Schveighoffer wrote:
> 2. There are no rules about what *encoding* is acceptable, it's 
> implementation defined. So various compilers have different 
> rules as to what will be accepted in the actual source code. In 
> fact, I read somewhere that not even ASCII is guaranteed to be 
> supported.
>
Indeed. IBM mainframes have C compilers too but not ASCII. They 
code in EBCDIC. That's why for instance it's not portable to do 
things like

      if(c >= 'A' && c <= 'Z') printf("CAPITAL LETTER\n");

is not true in EBCDIC.