$c7fd0018 switch-with-block-scope-return.js:12:1
  Registers: 7
  Blocks:    1
  Constants:
    [0] = Undefined
    [1] = Int32(1)

block0:
  [   0] GetGlobal dst:reg6, `f`
  [  10] Call dst:reg5, callee:reg6, this_value:Undefined, f, arguments:[Int32(1)]
  [  38] End value:reg5


f$83fadf14 switch-with-block-scope-return.js:2:5
  Registers: 8
  Blocks:    7
  Constants:
    [0] = Int32(1)
    [1] = Int32(2)
    [2] = String("one")
    [3] = String("two")
    [4] = Undefined
    [5] = String("other")

block0:
  [   0] GetLexicalEnvironment dst:reg4
  [   8] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0, is_catch_environment:false
  [  20] CreateImmutableBinding environment:reg5, `y`, strict_binding:true
  [  30] JumpStrictlyEquals lhs:Int32(1), rhs:arg0, true_target:block3, false_target:block1

block1:
  [  48] JumpStrictlyEquals lhs:Int32(2), rhs:arg0, true_target:block4, false_target:block2

block2:
  [  60] Jump target:block5

block3:
  [  68] SetLexicalEnvironment environment:reg4
  [  70] Return value:String("one")

block4:
  [  78] InitializeLexicalBinding `y`, src:String("two")
  [  90] NewFunction dst:reg7, shared_function_data_index:0
  [  a8] Call dst:reg6, callee:reg7, this_value:Undefined
  [  c8] SetLexicalEnvironment environment:reg4
  [  d0] Return value:reg6

block5:
  [  d8] SetLexicalEnvironment environment:reg4
  [  e0] Return value:String("other")

block6:
  [  e8] SetLexicalEnvironment environment:reg4
  [  f0] End value:Undefined