Function windows_sys::Win32::Globalization::UCNV_FROM_U_CALLBACK_SUBSTITUTE
pub unsafe extern "cdecl" fn UCNV_FROM_U_CALLBACK_SUBSTITUTE(
context: *const c_void,
fromuargs: *mut UConverterFromUnicodeArgs,
codeunits: *const u16,
length: i32,
codepoint: i32,
reason: UConverterCallbackReason,
err: *mut UErrorCode,
)