a = 1

b = "foo"

c = (1 | "foo" | ???*0*)
- *0* [][???*1*]
  ⚠️  unknown array prototype methods or values
- *1* ???*2*["index"]
  ⚠️  unknown object
  ⚠️  This value might have side effects
- *2* FreeVar(global)
  ⚠️  unknown global
  ⚠️  This value might have side effects

d1 = [1, "foo"]

d2 = (1 | "foo" | ???*0*)
- *0* [][???*1*]
  ⚠️  unknown array prototype methods or values
- *1* ???*2*["index"]
  ⚠️  unknown object
  ⚠️  This value might have side effects
- *2* FreeVar(global)
  ⚠️  unknown global
  ⚠️  This value might have side effects

d3 = ("foo" | ???*0*)
- *0* unknown mutation
  ⚠️  This value might have side effects

d4 = ???*0*
- *0* [1, "foo"][2]
  ⚠️  invalid index

value#3 = (1 | "foo" | ???*0*)
- *0* unknown mutation
  ⚠️  This value might have side effects

value#5 = ???*0*
- *0* unknown mutation
  ⚠️  This value might have side effects