string concatenation

[Andrei Alexandrescu]

TDPL boasts the code:

void main()
{
   string a = "Hall\u00E5";
   wstring b = ", ";
   dstring c = "V\u00E4rld";
   auto d = b ~ c;           // d has type wstring, same as b
   a ~= d ~ '!';             // concatenate string with character
   writeln(a);
}

We are having second thoughts about allowing b ~ c. It may be just a bit 
too clever. Also, figuring out the result type is not a slam dunk. The 
pro arguments are that strings are already supported by the compiler in 
iteration, literals, and concatenation of a char[] with a dchar.

What say you?


Andrei