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// RUN: %clang_cc1 -E %s | grep 'a: 2 + M_0(3)(4)(5);'
// RUN: %clang_cc1 -E %s | grep 'b: 4 + 4 + 3 + 2 + 1 + M_0(3)(2)(1);'

#define M_0(x) M_ ## x 
#define M_1(x) x + M_0(0) 
#define M_2(x) x + M_1(1) 
#define M_3(x) x + M_2(2) 
#define M_4(x) x + M_3(3) 
#define M_5(x) x + M_4(4) 

a: M_0(1)(2)(3)(4)(5);
b: M_0(5)(4)(3)(2)(1);