================================================================================
Empty comment
================================================================================

//

--------------------------------------------------------------------------------

(source_file
  (line_comment))

================================================================================
Single comment
================================================================================

// This is a comment

--------------------------------------------------------------------------------

(source_file
  (line_comment))

================================================================================
Multiple comments
================================================================================

// This is a comment
// This is a second comment

--------------------------------------------------------------------------------

(source_file
  (line_comment)
  (line_comment))