1 l=[foo]

     2 l=[foo, foo2]

     3 l2_size()=0

     4 Bound Integer(2) constructor: 2

     5 BiFunction with literal: unbound, 1, 2

     6 BiFunction with literal: unbound, 3, 4

     7 BiFunction with literal: unbound, 5, 6

     8 BiFunction with function: undefined, 7, 8

     9 BiFunction with function: undefined, 9, 10

    10 BiFunction with function: undefined, 11, 12