12:41 >perl -Mstrict -wE "package myPackage; sub function1 { myPackage::function2('Hi!'); } sub function2 { say qq[@_]; } function1();"
Hi!

12:41 >perl -Mstrict -wE "package myPackage; sub function1 { function2('Hi!'); } sub function2 { say qq[@_]; } function1();"
Hi!

12:41 >perl -Mstrict -wE "package myPackage; sub function1 { myPackage->function2('Hi!'); } sub function2 { say qq[@_]; } function1();"
myPackage Hi!

12:41 >