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      1 // RUN: %clang_cc1 %s -E | FileCheck %s
      2 
      3 #define FOO bar ## baz ## 123
      4 
      5 // CHECK: A: barbaz123
      6 A: FOO
      7 
      8 // PR9981
      9 #define M1(A) A
     10 #define M2(X) X
     11 B: M1(M2(##))
     12 
     13 // CHECK: B: ##
     14 
     15