Concatenation is for strings. You need to make a copy of the first coderef and make a new coderef that calls the copy. Note that the copy stays around, even though it's gone out of scope, because the new one creates a closure around it. Here's an example:

my $code = sub {
    print "Sub 1";
};

$code = do {
    my $oldcode = $code;
    sub {
        $oldcode->();
        print "Sub 2";
    };
};

$code->();
[download]

Update: this do block could be further generalized into a subroutine, but that's an exercise left to the reader. :-)

Update: phaylon's solution is much simpler, and the OP seems happy with it, but the closure technique I've shown is a way to get both [or as many as necessary] to execute from a single starting point, [update] and without a loop at all :-P

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