=====================================
regular
=====================================

snake_case
camelCase
az_AZ_19
bang!
question?
doctest
not1
notfalse

---

(source
  (identifier)
  (identifier)
  (identifier)
  (identifier)
  (identifier)
  (identifier)
  (identifier)
  (identifier))

=====================================
unused
=====================================

_
_number
__TEST__

---

(source
  (identifier)
  (identifier)
  (identifier))

=====================================
three dots identifier
=====================================

...

---

(source
  (identifier))

=====================================
special identifier
=====================================

__MODULE__
__DIR__

---

(source
  (identifier)
  (identifier))
