/in/foo.cc:2:13: error: stray '@' in program
    2 |  hanye LV 7 @ 3 年前
      |             ^
/in/foo.cc:2:2: error: 'hanye' does not name a type
    2 |  hanye LV 7 @ 3 年前
      |  ^~~~~
In file included from /usr/include/c++/12/iosfwd:40,
                 from /usr/include/c++/12/ios:38,
                 from /usr/include/c++/12/ostream:38,
                 from /usr/include/c++/12/iostream:39,
                 from /in/foo.cc:3:
/usr/include/c++/12/bits/postypes.h:68:11: error: 'ptrdiff_t' does not name a type
   68 |   typedef ptrdiff_t     streamsize; // Signed integral type
      |           ^~~~~~~~~
/usr/include/c++/12/bits/postypes.h:41:1: note: 'ptrdiff_t' is defined in header '<cstddef>'; did you forget to '#include <cstddef>'?
   40 | #include <cwchar> // For mbstate_t
  +++ |+#include <cstddef>
   41 | 
In file included from /usr/include/c++/12/bits/exception_ptr.h:40,
                 from /usr/include/c++/12/exception:168,
                 from /usr/include/c++/12/ios:39:
/usr/include/c++/12/new:126:26: error: declaration of 'operator new' as non-function
  126 | _GLIBCXX_NODISCARD void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
      |                          ^~~~~~~~
/usr/include/c++/12/new:126:44: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
  126 | _GLIBCXX_NODISCARD void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
      |                                            ^~~~~~
In file included from /usr/include/wchar.h:35,
                 from /usr/include/c++/12/cwchar:44,
                 from /usr/include/c++/12/bits/postypes.h:40:
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/12/new:127:41: error: attributes after parenthesized initializer ignored [-fpermissive]
  127 |   __attribute__((__externally_visible__));
      |                                         ^
/usr/include/c++/12/new:128:26: error: declaration of 'operator new []' as non-function
  128 | _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
      |                          ^~~~~~~~
/usr/include/c++/12/new:128:46: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
  128 | _GLIBCXX_NODISCARD void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
      |                                              ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/12/new:129:41: error: attributes after parenthesized initializer ignored [-fpermissive]
  129 |   __attribute__((__externally_visible__));
      |                                         ^
/usr/include/c++/12/new:140:26: error: declaration of 'operator new' as non-function
  140 | _GLIBCXX_NODISCARD void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
      |                          ^~~~~~~~
/usr/include/c++/12/new:140:44: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
  140 | _GLIBCXX_NODISCARD void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
      |                                            ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/12/new:140:52: error: expected primary-expression before 'const'
  140 | _GLIBCXX_NODISCARD void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
      |                                                    ^~~~~
/usr/include/c++/12/new:142:26: error: declaration of 'operator new []' as non-function
  142 | _GLIBCXX_NODISCARD void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
      |                          ^~~~~~~~
/usr/include/c++/12/new:142:46: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
  142 | _GLIBCXX_NODISCARD void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
      |                                              ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/12/new:142:54: error: expected primary-expression before 'const'
  142 | _GLIBCXX_NODISCARD void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
      |                                                      ^~~~~
/usr/include/c++/12/new:174:33: error: declaration of 'operator new' as non-function
  174 | _GLIBCXX_NODISCARD inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
      |                                 ^~~~~~~~
/usr/include/c++/12/new:174:51: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
  174 | _GLIBCXX_NODISCARD inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
      |                                                   ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/12/new:174:59: error: expected primary-expression before 'void'
  174 | _GLIBCXX_NODISCARD inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
      |                                                           ^~~~
/usr/include/c++/12/new:176:33: error: declaration of 'operator new []' as non-function
  176 | _GLIBCXX_NODISCARD inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
      |                                 ^~~~~~~~
/usr/include/c++/12/new:176:53: error: 'size_t' is not a member of 'std'; did you mean 'size_t'?
  176 | _GLIBCXX_NODISCARD inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
      |                                                     ^~~~~~
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:214:23: note: 'size_t' declared here
  214 | typedef __SIZE_TYPE__ size_t;
      |                       ^~~~~~
/usr/include/c++/12/new:176:61: error: expected primary-expression before 'void'
  176 | _GLIBCXX_NODISCARD inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
      |                                                             ^~~~
In file included from /usr/include/c++/12/bits/move.h:57,
                 from /usr/include/c++/12/bits/exception_ptr.h:43:
/usr/include/c++/12/type_traits:452:31: error: 'std::size_t' has not been declared
  452 |   template<typename _Tp, std::size_t _Size>
      |                               ^~~~~~
/usr/include/c++/12/type_traits:453:25: error: '_Size' was not declared in this scope
  453 |     struct is_array<_Tp[_Size]>
      |                         ^~~~~
/usr/include/c++/12/type_traits:453:31: error: template argument 1 is invalid
  453 |     struct is_array<_Tp[_Size]>
      |                               ^
/usr/include/c++/12/type_traits:558:42: error: 'nullptr_t' is not a member of 'std'; did you mean 'nullptr_t'?
  558 |     struct __is_null_pointer_helper<std::nullptr_t>
      |                                          ^~~~~~~~~
In file included from /usr/include/c++/12/bits/cxxabi_init_exception.h:38,
                 from /usr/include/c++/12/bits/exception_ptr.h:38:
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:442:29: note: 'nullptr_t' declared here
  442 |   typedef decltype(nullptr) nullptr_t;
      |                             ^~~~~~~~~
/usr/include/c++/12/type_traits:558:42: error: 'nullptr_t' is not a member of 'std'; did you mean 'nullptr_t'?
  558 |     struct __is_null_pointer_helper<std::nullptr_t>
      |                                          ^~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/12/include/stddef.h:442:29: note: 'nullptr_t' declared here
  442 |   typedef decltype(nullptr) nullptr_t;
      |                             ^~~~~~~~~
/usr/include/c++/12/type_traits:558:51: error: template argument 1 is invalid
  558 |     struct __is_null