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/* { dg-do run } */
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#define D_2 1, 2
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#define C_2(X, I0, I1) X##_a = I0, X##_b = I1
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#define B_2(X, I) C_2(X, I)
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#define A(N, X) B_##N (X, D_##N)
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extern void abort(void);
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extern void exit(int);
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int x_a, x_b;
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int main(void)
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{
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A(2, x);
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if (x_a != 1 || x_b != 2)
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abort();
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exit(0);
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}
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