subs(3)

NNAAMMEE
       subs - Perl pragma to predeclare sub names

SSYYNNOOPPSSIISS
           use subs qw(frob);
           frob 3..10;

DDEESSCCRRIIPPTTIIOONN
       This will predeclare all the subroutine whose names are in
       the list, allowing you to use them without parentheses
       even before they're declared.

       Unlike pragmas that affect the $^H hints variable, the use
       vars and use subs declarations are not BLOCK-scoped.  They
       are thus effective for the entire file in which they
       appear.  You may not rescind such declarations with no
       vars or no subs.

       See the section on Pragmatic Modules in the perlmod
       manpage and the section on strict subs in the strict
       manpage.