text: /* n_3.c:   Handling of comment.    */
  
  /* 3.1: A comment is converted to one space.    */
  /*  abc de  */
      abc/* comment */de
  
  /* 3.2: // is not a comment of C.   */
  #if 0   /* This feature is obsolete now.  */
  /*  // is not a comment of C    */
      // is not a comment of C
  #endif
  
  /* 3.3: Comment is parsed prior to the parsing of preprocessing directive.  */
  /*  abcd    */
  #if     0
      "nonsence"; /*
  #else
      still in
      comment     */
  #else
  #define MACRO_abcd  /*
      in comment
      */  abcd
  #endif
      MACRO_abcd
  
  /* { dg-do preprocess }
     { dg-options "-ansi -w" }
     { dg-final { if ![file exist n_3.i] { return }                       } }
     { dg-final { if \{ [grep n_3.i "abc de"] != ""               \} \{   } }
     { dg-final { if \{ [grep n_3.i "abcd"] != ""                 \} \{   } }
     { dg-final { return \} \}                                            } }
     { dg-final { fail "n_3.c: handling of comments"                      } }
   */
  