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// RUN: %clang_cc1 -E %s | grep '1: aaab 2'
// RUN: %clang_cc1 -E %s | grep '2: 2 baaa'
// RUN: %clang_cc1 -E %s | grep '3: 2 xx'
#define a(n) aaa ## n
#define b 2
1: a(b b) // aaab 2 2 gets expanded, not b.
#undef a
#undef b
#define a(n) n ## aaa
#define b 2
2: a(b b) // 2 baaa 2 gets expanded, not b.
#define baaa xx
3: a(b b) // 2 xx