$ perl -l
#!/usr/bin/perl --
use strict;
use warnings;
use diagnostics;


sub switch {
    no warnings 'exiting';
    while (@_) {
        my ($case, $action) = splice @_,0,2;
        return $action->($case) if $_ ~~ $case;
    }
}


no warnings 'exiting';
switch
  [1,2,3] => sub { print "bla" ; next},
  3       => sub { print "bla2" }
  for (3);
use warnings 'exiting';
switch
  [1,2,3] => sub { print "bla" ; next},
  3       => sub { print "bla2" }
  for (3);
use warnings 'exiting';
switch
  [1,2,3] => sub { no warnings 'exiting'; print "bla" ; next},
  3       => sub { no warnings 'exiting'; print "bla2" }
  for (3);

__END__
bla
bla2
bla
Exiting subroutine via next at - line 23 (#1)
    (W exiting) You are exiting a subroutine by unconventional means, such
    as a goto, or a loop control statement.

bla2
bla
bla2