SOURCE_FILE
  EXTERN_CRATE
    EXTERN_KW "extern"
    WHITESPACE " "
    CRATE_KW "crate"
    WHITESPACE " "
    NAME_REF
      IDENT "foo"
    SEMICOLON ";"
  WHITESPACE "\n"
  EXTERN_CRATE
    EXTERN_KW "extern"
    WHITESPACE " "
    CRATE_KW "crate"
    WHITESPACE " "
    NAME_REF
      SELF_KW "self"
    SEMICOLON ";"
  WHITESPACE "\n"
