Coding ERROR compiling MARLIN 2.0

Projects Programming
6

I just included the declaration of the EITHER() macro, not the whole file. Using the whole file, this compiles without error:

Arduino: 1.8.13 (Mac OS X), Board: "Arduino Uno"

#include "macros.h"

#define PARKING_EXTRUDER 0
#define MAGNETIC_PARKING_EXTRUDER 1

#if EITHER(PARKING_EXTRUDER, MAGNETIC_PARKING_EXTRUDER)

#endif

void setup() {}
void loop() {}