These are all examples of arbitrarily nested loops in p6
For details, see http://perlmonks.org/?node_id=462987
For example:
LoopOver( ([1..3], ['a'..'z'], ['foo', 'bar']) );
Where LoopOver needs to figure out dynamically
for 1..3 {
for 'a'..'z' {
for <foo bar> {
...
}
}
}