a = ("" | `${???*0*}x`)
- *0* a
  ⚠️  circular variable reference

b = (0 | ???*0*)
- *0* unsupported assign operation
  ⚠️  This value might have side effects

c = (0 | ???*0*)
- *0* updated with update expression
  ⚠️  This value might have side effects

d = (0 | 1)

e = (1 | 2)

f = (1 | 2)