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      1 // RUN: %clang_cc1 -E %s | grep '^a: x$'
      2 // RUN: %clang_cc1 -E %s | grep '^b: x y, z,h$'
      3 // RUN: %clang_cc1 -E %s | grep '^c: foo(x)$'
      4 
      5 #define A(b, c...) b c
      6 a: A(x)
      7 b: A(x, y, z,h)
      8 
      9 #define B(b, c...) foo(b, ## c)
     10 c: B(x)
     11