Use the imported "Sub" instead of "sub", and you can create an anonymous coderef that acts normally except when dereferenced as a string, where it returns the filename and line number of where it was defined. See the example for usage.
This code came from the discussion in the thread that includes •Re^5: How to de-reference a coderef?.
BEGIN {
package MagicalCoderef;
use overload '""' => sub {
require B;
my $ref = shift;
my $gv = B::svref_2object($ref)->GV;
sprintf "%s:%d", $gv->FILE, $gv->LINE;
};
sub main::Sub (&) {
return bless shift, __PACKAGE__;
}
}
my $s = Sub { print +shift };
$s->("hello world\n");
print "$s\n";
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