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      1 // RUN: %clang_cc1 %s -E | grep 'pre: 1 1 X'
      2 // RUN: %clang_cc1 %s -E | grep 'nopre: 1A(X)'
      3 
      4 /* Preexpansion of argument. */
      5 #define A(X) 1 X
      6 pre: A(A(X))
      7 
      8 /* The ## operator disables preexpansion. */
      9 #undef A
     10 #define A(X) 1 ## X
     11 nopre: A(A(X))
     12 
     13