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# built in
push @array, $first, $second, @all;
...
# so you can call it as
my_push @arr, 'as', 'it was', 'a builtin';

perl -MConfig -e "print qq(For Perl $Config{version} the push prototyp
+e is: ),prototype 'CORE::push' "
For Perl 5.8.8 the push prototype is: \@@
...
perl -MConfig -e "print qq(For Perl $Config{version} the push prototyp
+e is: ),prototype 'CORE::push' "
For Perl 5.14.2 the push prototype is: +@

my_grep (&@){
...
   ...
}