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Stringify macro values in Objective C?
#define ASSIGN_PROPERTY(PROP_NAME, PROP_NAME_PARAM) {
  if (PROP_NAME_PARAM == nil) {
    NSAssert(PROP_NAME != nil, @"#PROP_NAME is already nil");
    PROP_NAME = nil;
  } else {
    NSAssert1(PROP_NAME == nil, @"#PROP_NAME is already set, address=%p", PROP_NAME);
    PROP_NAME = PROP_NAME_PARAM;
  }
}

- (void) setFoo:(NSObject *)fooParam {
  ASSIGN_PROPERTY(foo, fooParam)
}

foo is already set, address=0x5e55400

#PROP_NAME is already set, address=0x5e55400

NSAssert(PROP_NAME != nil, @"%s is already nil", #PROP_NAME);