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#if U_SIZEOF_WCHAR_T==2
    typedef wchar_t UChar;
#elif U_GNUC_UTF16_STRING
#if defined _GCC_
    typedef __CHAR16_TYPE__ char16_t;
#endif
    typedef char16_t UChar;
#else
    typedef uint16_t UChar;
#endif

e.g. if wchar_t is 16 bit wide, try to use this; otherwise fall back to another 16 bit type.

The case is even simpler for the glib unicode backend. UnicodeGLib.h:
typedef uint16_t UChar;

Again, a 16 bit type.

And same goes for gunichar2 which is defined in glib's gunicode.h header:
typedef guint16 gunichar2;

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