$03b9f5e5 invalid-lhs-forin-no-dead-code.js:6:6
  Registers: 11
  Blocks:    6
  Constants:
    [0] = Undefined

block0:
  [   0] NewArray dst:reg5
  [  10] JumpNullish condition:reg5, true_target:block3, false_target:block4

block1:
  [  20] End value:reg5

block2:
  [  28] ObjectPropertyIteratorNext dst_value:reg7, dst_done:reg8, iterator_object:reg6
  [  38] JumpIf condition:reg8, true_target:block1, false_target:block5

block3:
  [  48] End value:reg5

block4:
  [  50] GetObjectPropertyIterator dst_iterator:reg6, object:reg5
  [  68] Mov dst:reg5, src:Undefined
  [  78] Jump target:block2

block5:
  [  80] GetGlobal dst:reg10, `f`
  [  98] Call dst:reg9, callee:reg10, this_value:Undefined, f
  [  b8] NewReferenceError dst:reg9, Invalid left-hand side in assignment
  [  c8] Throw src:reg9