$3122836b for-in-lexical-scope.js:1:12
  Registers: 12
  Blocks:    6
  Constants:
    [0] = Int32(0)
    [1] = Undefined

block0:
  [   0] GetLexicalEnvironment dst:reg4
  [   8] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0
  [  18] CreateVariable `x`, is_immutable:false, is_global:false, is_strict:false
  [  28] NewObject dst:reg6
  [  38] InitObjectLiteralProperty object:reg6, `i`, src:Int32(0), shape_cache_index:0, property_slot:0
  [  50] CacheObjectShape object:reg6
  [  60] SetLexicalEnvironment environment:reg4
  [  68] JumpNullish condition:reg6, true_target:block3, false_target:block4

block1:
  [  78] End value:reg6

block2:
  [  80] ObjectPropertyIteratorNext dst_value:reg7, dst_done:reg8, iterator_object:reg5
  [  90] JumpIf condition:reg8, true_target:block1, false_target:block5

block3:
  [  a0] End value:reg6

block4:
  [  a8] GetObjectPropertyIterator dst_iterator:reg5, object:reg6
  [  c0] Mov dst:reg6, src:Undefined
  [  d0] Jump target:block2

block5:
  [  d8] CreateLexicalEnvironment dst:reg9, parent:reg4, capacity:0
  [  e8] CreateVariable `x`, is_immutable:false, is_global:false, is_strict:false
  [  f8] InitializeLexicalBinding `x`, src:reg7
  [ 110] CreateLexicalEnvironment dst:reg10, parent:reg9, capacity:0
  [ 120] CreateMutableBinding environment:reg10, `probeDecl`, can_be_deleted:false
  [ 130] NewFunction dst:reg11, shared_function_data_index:0
  [ 148] InitializeLexicalBinding `probeDecl`, src:reg11
  [ 160] GetBinding dst:reg11, `probeDecl`
  [ 178] SetVariableBinding `probeDecl`, src:reg11
  [ 190] SetLexicalEnvironment environment:reg9
  [ 198] SetLexicalEnvironment environment:reg4
  [ 1a0] Jump target:block2