For many Perl functions, the CORE package contains real subroutines. This
feature is new in Perl 5.16. You can take references to these and make
-aliases. However, they can only be called as barewords; i.e., you cannot
+aliases. However, some can only be called as barewords; i.e., you cannot
use ampersand syntax (C<&foo>) or call them through references. See the
-C<shove> example above. This works for all overridable keywords, except
-for C<dump> and the infix operators.
+C<shove> example above. These subroutines exist for all keywords except the following:
+
+C<__DATA__>, C<__END__>, C<and>, C<cmp>, C<default>, C<do>, C<dump>,
+C<else>, C<elsif>, C<eq>, C<eval>, C<for>, C<foreach>, C<format>, C<ge>,
+C<given>, C<goto>, C<grep>, C<gt>, C<if>, C<last>, C<le>, C<local>, C<lt>,
+C<m>, C<map>, C<my>, C<ne>, C<next>, C<no>, C<or>, C<our>, C<package>,
+C<print>, C<printf>, C<q>, C<qq>, C<qr>, C<qw>, C<qx>, C<redo>, C<require>,
+C<return>, C<s>, C<say>, C<sort>, C<state>, C<sub>, C<tr>, C<unless>,
+C<until>, C<use>, C<when>, C<while>, C<x>, C<xor>, C<y>
+
+Calling with
+ampersand syntax and through references does not work for the following
+functions, as they have special syntax that cannot always be translated
+into a simple list (e.g., C<eof> vs C<eof()>):
+
+C<chdir>, C<chomp>, C<chop>, C<defined>, C<delete>, C<each>,
+C<eof>, C<exec>, C<exists>, C<keys>, C<lstat>, C<pop>, C<push>,
+C<shift>, C<splice>, C<split>, C<stat>, C<system>, C<truncate>,
+C<unlink>, C<unshift>, C<values>
=head1 OVERRIDING CORE FUNCTIONS
To override a Perl built-in routine with your own version, you need to
-import it at compile-time. This can be conveniently achieved with the
-C<subs> pragma. This will affect only the package in which you've imported
+import it at compile-time. This can be conveniently achieved with the
+C<subs> pragma. This will affect only the package in which you've imported
the said subroutine:
use subs 'chdir';