SOURCE_FILE
  EXTERN_CRATE
    EXTERN_KW "extern"
    WHITESPACE " "
    CRATE_KW "crate"
    WHITESPACE " "
    NAME_REF
      IDENT "foo"
    WHITESPACE " "
    RENAME
      AS_KW "as"
      WHITESPACE " "
      NAME
        IDENT "bar"
    SEMICOLON ";"
  WHITESPACE "\n"
