Interpolated strings

[Nick Treleaven via Digitalmars-d]

On Thursday, 20 April 2017 at 19:02:20 UTC, Kagamin wrote:
> Also how various kinds of strings would work?
> r$"{can}\i\has{slashes}"
> $`same {here}`

r"" and `` are WysiwygStrings. Interpolation is not WYSIWYG.

$"" would need to support escaping of the interpolation start 
character, so may as well escape with backslash like "" strings.

> $q{{balanced}braces}

q{} strings have to lex correctly, so are intended for code - 
brace interpolation would play badly with braces in code. It 
might be useful with mixins if using a different interpolation 
syntax, e.g. $identifier or ${var+1} syntax within the string:

void fun(string op)(T a, T b){
     mixin(text($q{$a $op= $b;}));
}

(I used `text` for Dmitry's AliasSeq expansion - use `format` for 
Walter's).