In my understanding, you absolutely can do this with Perl 6 macros. If you want $foo to be avaluated at compile time, you just return a string as you did. Contrariwise, if you return a closure (maybe using the simple my macro this { self{$foo} } syntax?), you get "a generic routine that is to be immediately inlined, treating the closure as a template", such that "any variable not referring back to a parameter is left alone, so that your template can declare its own lexical variables, or refer to a package variable". This way, $foo will be evaluated at runtime...
But, as always with Perl 6, don't take my words for granted...:-)
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