Description:

By default, this module exports the caller function. This automatically
returns a new caller object. An optional argument specifies how many stack
frames back to skip, just like the CORE::caller function. This lets you do
things like this:

print "In ", caller->subroutine,
" called from ", caller->filename,
" line ", caller->line;

If you do not wish the caller function imported, specify an empty import list
and instantiate a new Perl6::Caller object.

use Perl6::Caller ();
my $caller = Perl6::Caller->new;
print $caller->line;

Note: if the results from the module seem strange, please read
perldoc -s caller carefully. It has stranger behavior than you might be aware.