When is a syntax error NOT a syntax error? (C5505 CGT 4.4.1)

All:

I am confused about some code that works, but has a confusing ? in front of the code. When I hover over the ?, I get "syntax error."

Code is below - it works fine! (In fact I am running the UART very well with the defines given.)

UART_DLL = C5505_UART_BAUD_LOW;

UART_DLH = C5505_UART_BAUD_HIGH;

In my header file, I define

#define C5505_UART_BAUD_LOW 0x0004

#define C5505_UART_BAUD_HIGH 0x0000

and

#define UART_DLL *(volatile ioport Uint16*)(0x1B10)

#define UART_DLH *(volatile ioport Uint16*)(0x1B12)

These ? do not even show up as compiler warnings, unless I need some other "level."  Any idea why this is happening?