Aw c'mon, it was a gripping read until the end and then.. no unquote?!
Here I might as well ask HN what syntax I should go with for unquotes in 007. In Perl 6, unquotes are written as three nested braces: {{{$ast}}}
Almost no-one is happy with that syntax. It manages to be distinctive (and can be easily syntax-highlighted, too) but pretty it ain't.
The difficulty of finding something better is that it has to be orthogonal to basically all other syntax in the language. And that's a challenge in Perl. :) People keep proposing Unicode sigils and stuff, but I haven't seen something I like yet.