JS bytecode executable ""
[   0]    0: GetLexicalEnvironment dst:reg4
[   8]       NewObject dst:reg5
[  18]       SetGlobal identifier:x, src:reg5
[  28]       NewPrimitiveArray dst:reg5, elements:[42]
[  40]       Mov dst:reg6, src:Bool(false)
[  50]       GetIterator dst_iterator_object:reg7, dst_iterator_next:reg8, dst_iterator_done:reg9, iterable:reg5
[  68]       GetGlobal dst:reg10, identifier:x
[  78]       IteratorNextUnpack dst_value:reg11, dst_done:reg6, iterator_object:reg7, iterator_next:reg8, iterator_done:reg9
[  90]       JumpFalse condition:reg6, target:@b8
[  a0]    1: Mov dst:reg11, src:Undefined
[  b0]       Jump target:@b8
[  b8]    2: PutNormalById base:reg10, property:y, src:reg11
[  d0]       JumpFalse condition:reg6, target:@e8
[  e0]    3: End value:reg5
[  e8]    4: IteratorClose iterator_object:reg7, iterator_next:reg8, iterator_done:reg9, completion_value:Undefined
[ 100]       End value:reg5