SOURCE_FILE
  STRUCT
    STRUCT_KW "struct"
    WHITESPACE " "
    NAME
      IDENT "S"
    WHITESPACE " "
    TUPLE_FIELD_LIST
      L_PAREN "("
      TUPLE_FIELD
        ATTR
          POUND "#"
          L_BRACK "["
          META
            PATH
              PATH_SEGMENT
                NAME_REF
                  IDENT "attr"
          R_BRACK "]"
        WHITESPACE " "
        PATH_TYPE
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "f32"
      R_PAREN ")"
    SEMICOLON ";"
  WHITESPACE "\n"
