Invalid preprocessor directive include inside variadic macro

Question

In C I wanted to use preprocessor directives inside a macro. Since this doesn't work, I stumbled over this answer about variadic macros, where a macro accepts a varying amount of arguments.

The answer contained following example:

#ifdef FOO
#define IF_FOO(...) __VA_ARGS__ 
#define NO_FOO(...)
#else
#define IF_FOO(...)
#define NO_FOO(...) __VA_ARGS__
#endif

IF_FOO(
  #define BAR 5
  int foo = BAR;
)
NO_FOO(
  #define foo 5
)

As you can see, there's a #define inside IF_FOO, which compiles without errors. However when I use #include it still compiles but the is underlined red (see below). I use the following code:

#ifdef HW_TEST
    #define IF_HW_TEST(...)                 __VA_ARGS__
#else
    #define IF_HW_TEST(...)                 /* ignore */
#endif


IF_HW_TEST(
    #include "hwTesting.h"
    TestMain();
    return;
)

What's the reason for this, or am I missing something?

I use Eclipse (Renesas e2 Studio) and the CC-RL compiler.