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Comments
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1 + 2
// 1 + 2
/* very
  /* nested
     /* comment */
  goes
  */ 
  here
*/
// "strings are cool too"
/* even """multiline strings""" */

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(source_file
  (additive_expression
    (integer_literal)
    (integer_literal))
  (line_comment)
  (multiline_comment)
  (line_comment)
  (multiline_comment))
