Annex C (informative) Compatibility [diff]

C.6 C standard library [diff.library]

C.6.3 Modifications to definitions []

C.6.3.2 Type wchar_­t [diff.wchar.t]

The type wchar_­t is a distinct type rather than a typedef to an existing integral type.
The token wchar_­t is a keyword in C++ ([lex.key]).
It does not appear as a macro or type name defined in any of <cstddef>, <cstdlib>, or <cwchar>.