================
comment
================
// abc

---

(source_file
    (line_comment)
)

================
block comment
================
/* abc */

---

(source_file
    (block_comment))


================
nested block comment
================
/* abc /* def */ */

---

(source_file
    (block_comment
        (block_comment)))

================
doc comment
================

/// abc

---
(source_file
    (doc_comment))
