=> args 1
=> sub { $REQ{baz} = $_[2] };
+chain_point '_set_user'
+ => chained '/'
+ => path_part 'user'
+ => capture_args 1
+ => sub { $REQ{user} = $_[2] };
+
+get ''
+ => chained '_set_user'
+ => args 0
+ => sub { $REQ{empty} = $REQ{user} };
+
sub normal : Chained('/') : Args(0) {
$REQ{normal}++;
}