clang/test/Preprocessor/cxx_true.cpp


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/* RUN: %clang_cc1 -E %s -x c++ | grep block_1
   RUN: %clang_cc1 -E %s -x c++ | not grep block_2
   RUN: %clang_cc1 -E %s -x c | not grep block
   RUN: %clang_cc1 -E %s -x c++ -verify -Wundef
*/

#if true
block_1
#endif

#if false
block_2
#endif