SOURCE_FILE
  ERROR
    ABI
      EXTERN_KW "extern"
      WHITESPACE " "
      STRING "\"C\""
  WHITESPACE " "
  ERROR
    ABI
      EXTERN_KW "extern"
      WHITESPACE " "
      STRING "\"C\""
  WHITESPACE "\n"
error 10: expected existential, fn, trait or impl
error 21: expected existential, fn, trait or impl