main
if
switch
for
while
do
continue
break
goto
return
sizeof
_Alignof
const
volatile
restrict
struct
union
_Alignas
typedef
_Static_assert
inline
_Noreturn
<ranges>
concept viewable_range =
viewable_range 概念是 range 的细化，它描述能安全转换成 view 的范围。