Interpolated strings

[Kagamin via Digitalmars-d]

On Tuesday, 18 April 2017 at 08:50:07 UTC, Walter Bright wrote:
> It may not be necessary to have any dependencies on any import.
>
>     $"{a} times 3 is {a*3}"
>
> could be rewritten by the parser to:
>
>     "%s times 3 is %s", a, a * 3
>
> and that is that. (I.e. just an AST rewrite.) It would be quite 
> a bit simpler than Jonas' proposed implementation.

For, say, sql query generator it would be nice to have a rewrite 
like
sql!"select name from users where id={n}"
=>
auto q=query("select name from users where id=@p0");
q.addParameter("p0",n);

pragma(autoMixin)
template sql(string txt)
{
   enum string sql=generateCode(txt);
}

If this can be rewritten as automatic string mixin like so:
sql!"select name from users where id={n}"
=>
mixin(sql!"select name from users where id={n}")