SOURCE_FILE@0..20
  IMPL_DEF@0..19
    DEFAULT_KW@0..7 "default"
    WHITESPACE@7..8 " "
    IMPL_KW@8..12 "impl"
    WHITESPACE@12..13 " "
    PATH_TYPE@13..16
      PATH@13..16
        PATH_SEGMENT@13..16
          NAME_REF@13..16
            IDENT@13..16 "Foo"
    WHITESPACE@16..17 " "
    ITEM_LIST@17..19
      L_CURLY@17..18 "{"
      R_CURLY@18..19 "}"
  WHITESPACE@19..20 "\n"