DB<140> package Foo; sub bar { print __PACKAGE__."::bar => [@_]\n"}
 
  DB<141> package main; sub bar { print __PACKAGE__."::bar => [@_]\n"}
 
  DB<142> bar Foo+6;
Foo::bar => [Foo 6]
 
  DB<143> use constant "Foo" =>5 
 
  DB<144> bar Foo+6;
main::bar => [11]