The state of string interpolation

Zoadian no at
Thu Dec 6 11:03:23 UTC 2018

would it be possible to have some kind of eponymous mixin 
templates in the language?
I'd imagine it to look something like this:

import std.stdio;

mixin template interp(string S) {
     mixin interp = S; //some fancy code to replace ${_var_} with 
content of _var_

void main() {
     int a = 5;
     string b = interp!"hello ${a} world";

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