c:\@Work\Perl\monks\R0b0t1>perl -wMstrict -le
"print 'perl version: ', $];
 ;;
 in_pkg('A');
 ;;
 package Foo {
   ::in_pkg('B');
   }
 ;;
 in_pkg('C');
 ;;
 sub in_pkg { print qq{$_[0]: in package }, scalar caller; }
"
perl version: 5.014004
A: in package main
B: in package Foo
C: in package main