$49b95e06 class-computed-key.js:10:1
  Registers: 7
  Blocks:    1
  Constants:
    [0] = Undefined

block0:
  [   0] GetGlobal dst:reg6, `f`
  [  10] Call dst:reg5, callee:reg6, this_value:Undefined, f
  [  30] End value:reg5


f$0a149d9a class-computed-key.js:4:5
  Registers: 8
  Blocks:    1

block0:
  [   0] GetLexicalEnvironment dst:reg4
  [   8] CreateLexicalEnvironment dst:reg5, parent:reg4, capacity:0, is_catch_environment:false
  [  20] CreateVariable ``, is_immutable:true, is_global:false, is_strict:true
  [  30] GetGlobal dst:reg6, `Symbol`
  [  40] GetById dst:reg7, base:reg6, `iterator` (Symbol.iterator)
  [  58] SetLexicalEnvironment environment:reg4
  [  60] NewClass dst:reg6, class_environment:reg5, class_blueprint_index:0, element_keys:[element_keys:reg7]
  [  88] Return value:reg6