Manpages - subs.3perl

subs - Perl pragma to predeclare subroutine names

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

This will predeclare all the subroutines whose names are in the list, allowing you to use them without parentheses (as list operators) even before they’re declared.

Unlike pragmas that affect the $^H hints variable, the use vars and use subs declarations are not lexically scoped to the block they appear in: they affect the entire package in which they appear. It is not possible to rescind these declarations with no vars or no subs.

See Pragmatic Modules in perlmodlib and strict subs in strict.