=head2 Package Constructors and Destructors
-There are two special subroutine definitions that function as package
+Three special subroutines act as package
constructors and destructors. These are the C<BEGIN>, C<INIT>, and
C<END> routines. The C<sub> is optional for these routines.
has run, it is immediately undefined and any code it used is returned to
Perl's memory pool. This means you can't ever explicitly call a C<BEGIN>.
+Similar to C<BEGIN> blocks, C<INIT> blocks are run just before the
+Perl runtime begins execution. For example, the code generators
+documented in L<perlcc> make use of C<INIT> blocks to initialize
+and resolve pointers to XSUBs.
+
An C<END> subroutine is executed as late as possible, that is, when
the interpreter is being exited, even if it is exiting as a result of
a die() function. (But not if it's polymorphing into another program
both C<BEGIN> and<END> blocks are run when you use the B<-c> switch
for a compile-only syntax check, although your main code is not.
-Similar to C<BEGIN> blocks, C<INIT> blocks are run just before the
-Perl runtime begins execution. For example, the code generators
-documented in L<perlcc> make use of C<INIT> blocks to initialize
-and resolve pointers to XSUBs.
-
=head2 Perl Classes
There is no special class syntax in Perl, but a package may act