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subs - Perl pragma to predeclare sub names
use subs qw(frob);
frob 3..10;
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 Pragmatic Modules in the perlmodlib manpage and strict subs in the strict manpage.