pub unsafe extern "C" fn ValidSlotValue(
arg1: *mut Environment,
arg2: *mut UDFValue,
arg3: *mut SlotDescriptor,
arg4: *mut Instance,
arg5: *const c_char,
) -> PutSlotErrorpub unsafe extern "C" fn ValidSlotValue(
arg1: *mut Environment,
arg2: *mut UDFValue,
arg3: *mut SlotDescriptor,
arg4: *mut Instance,
arg5: *const c_char,
) -> PutSlotError