$d36729be annexb-function-existing-var.js:10:1
  Registers: 7
  Blocks:    1
  Constants:
    [0] = Undefined

block0:
  [   0] GetGlobal dst:reg6, `test`
  [  18] Call dst:reg5, callee:reg6, this_value:Undefined, test
  [  38] End value:reg5


test$8422248c annexb-function-existing-var.js:2:5
  Registers: 7
  Blocks:    1
  Constants:
    [0] = Undefined
    [1] = Int32(123)
    [2] = Bool(true)

block0:
  [   0] GetLexicalEnvironment dst:reg4
  [   8] CreateVariable `f`, is_immutable:false, is_global:false, is_strict:false
  [  18] InitializeVariableBinding `f`, src:Undefined
  [  30] SetLexicalBinding `f`, src:Int32(123)
  [  48] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0
  [  58] CreateMutableBinding environment:reg5, `f`, can_be_deleted:false
  [  68] NewFunction dst:reg6, shared_function_data_index:0
  [  80] InitializeLexicalBinding `f`, src:reg6
  [  98] GetBinding dst:reg6, `f`
  [  b0] SetVariableBinding `f`, src:reg6
  [  c8] SetLexicalEnvironment environment:reg4
  [  d0] GetInitializedBinding dst:reg5, `f`
  [  e8] Return value:reg5