Proposal: Dedicated-string-mixin templates/functions

[Nick Sabalausky]

Point #1: It's often been noted that string mixin syntax is ugly. Which is a 
bad thing in and of itself, but it also tends to discourage use of string 
mixins despite their high degree of usefulness.

Point #2: It seems to me that the vast majority of templates and functions 
are either designed specifically to be used as a string mixin or 
specifically designed to be used as something other than a string mixin. 
Only rarely does a single template or function seem to be particularly 
useful both ways.

Proposal:
So how about taking a cue from Nemerle:

Current:
-----------------------
template foo1 {
    const char[] foo1 = "int a;";
}
char[] foo2() {
    return "int b;";
}
mixin(foo1!());
mixin(foo2());
-----------------------

Proposed:
-----------------------
mixin template foo1 {
    const char[] foo1 = "int a;";
}
mixin char[] foo2() {
    return "int b;";
}
foo1!();
foo2();
-----------------------

One consequence of this worth noting is that the current string-mixin could 
be trivially recreated under the proposed syntax:

-----------------------
mixin char[] mixinString(char[] str) {
    return str;
}
mixinString("int a;");
-----------------------

Maybe someone not as half-asleep as I currently am can point out a 
clean/clever way to retrieve the string value of such a template/function 
without actually mixing it in, to cover the occasional cases where that 
actually would be useful.