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/* 2.1  FOO defined (V) */

/* 2.2  BAR not defined, FOO defined (V) */

#if defined FOOBAR  // (V)
/* 2.3  FOOBAR defined (V) */
#elif defined FOOBAR2 // (V)
/* 2.3  FOOBAR not defined, FOOBAR2 defined (V) */
#else // (V)
/* 2.3  FOOBAR and FOOBAR2 not defined (V) */
#endif // (V)



/* Checking that #ifs in comment are not simplified:
#if defined BAR
  ... some text
#endif
 */
// #if defined BAR
//    some comment
// #endif

/* 3. Check nesting: */

/* 3.1 FOO defined, but not BAR (V) */
#if defined FOOBAR
/* 3.1 FOO and FOOBAR defined (V) */
#else
/* 3.1 FOO defined but not FOOBAR (V) */
#endif

#if defined FOOBAR //(V)
/* 3.1 BAR not defined, FOOBAR defined (V) */
#else //(V)
/* 3.1 BAR and FOOBAR not defined (V) */
#endif //(V)

/* 4:  Check complex expressions with #if:  */
// note: && has higher precedence than ||:

/* 4.1 FOO or BAR are undefined (V) */

/* 4.2 FOO or BAR are defined (V) */

/* 4.3 #if defined(D1) && defined(D2) || defined(U1) (V)*/


/* 4.4 #if defined(D1) || defined(D2) && defined(U1) (V) */

/* 4.5 #else (#if (defined(D1) || defined(D2)) && defined(U1)) (V)*/

#if defined(FOOBAR)
/* 4.6 #if (defined(D1) || defined(D2)) && defined(U1) || defined(FOOBAR) (V) */
#else
/* 4.6 #else */
#endif



#if (FOOBAR > 3 * (9 - 2) ) // eol comment
/* 4.20 complex... -- should resolve to #if ( FOOBAR > 3 * (9 - 2) ) // eol comment */
#else
/* 4.20 #else */
#endif

#if U1 > (3 + 2)   // (4.21 condition simplifies)
    /* 4.21 line will appear */
#else
    /* 4.21 line will appear, as an else to the unknown */
#endif


// Note: known bug: whitespace at opening brace is not being preserved...
// #if ( ( /*comment*/ FOOBAR > 3 * (9-2)) && defined(FOO) )
// does not preserve the comment or whitespaces.