test/Preprocessor/cxx_true.cpp


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/* RUN: clang -E %s -x=c++ | grep block_1 &&
   RUN: clang -E %s -x=c++ | not grep block_2 &&
   RUN: clang -E %s -x=c | not grep block
*/

#if true
block_1
#endif

#if false
block_2
#endif