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sub infix:<!*> (&f, &g) {
        return sub ($x)  {
                return f(g($x));
        };
}

sub test ($x) {
        return $x ~ " test";
...

# outputs (&test !* &test) test test
say (&test !* &test)('&test !* &test');

# Fails with too much recursion
say (&test !* (&test !* &test))('&test !* &test !* &test');

my $p = &test !* &test;
my $q = $p !* &test;
...
say $p('$p = &test !* &test');
#should be $p !* test test test (?),  but says $p !* test test
say $q('$p !*  &test');

function comp(f, g){
        return function(x){
...
}

print (comp(test,comp(test,test))("test "));

sub comp {
        $f = shift;
...
        return (shift) . " test";
}
print comp(\&test, comp(\&test,\&test))->("test ");

sub comp {
        my ($f, $g) = @_;
...
        return (shift) . " test";
}
print comp(\&test, comp(\&test,\&test))->("test ");