I'd say you'd have to use single quotes, e.g.:
my macro this { 'self{$foo}' }
I don't think rg0now's idea will work, because $foo would refer to some outer $foo. If my understanding is correct, you can do things like the following:
my $compilation_time = BEGIN { time };
macro uptime { time - $compilation_time }
# And then...
say "$*PROGRAM_NAME has been running for {uptime} seconds.";
(Update: Doing s/macro/sub/ here would work just fine, too.)
But, as rg0now said, that may be wrong, of course.
--Ingo
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