$32b2807a destructuring-no-base-identifier.js:1:1
  Registers: 12
  Blocks:    5
  Constants:
    [0] = Bool(false)
    [1] = Undefined

block0:
  [   0] NewObject dst:reg5
  [  10] SetGlobal `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, `x`
  [  80] IteratorNextUnpack dst_value:reg11, dst_done:reg6, iterator_object:reg7, iterator_next:reg8, iterator_done:reg9
  [  98] JumpFalse condition:reg6, target:block2

block1:
  [  a8] Mov dst:reg11, src:Undefined
  [  b8] Jump target:block2

block2:
  [  c0] PutById base:reg10, `y`, src:reg11, kind:Normal
  [  e8] JumpFalse condition:reg6, target:block4

block3:
  [  f8] End value:reg5

block4:
  [ 100] IteratorClose iterator_object:reg7, iterator_next:reg8, iterator_done:reg9, completion_value:Undefined
  [ 118] End value:reg5