1// RUN: %clang_cc1 %s -E | grep 'pre: 1 1 X'
2// RUN: %clang_cc1 %s -E | grep 'nopre: 1A(X)'
3
4/* Preexpansion of argument. */
5#define A(X) 1 X
6pre: A(A(X))
7
8/* The ## operator disables preexpansion. */
9#undef A
10#define A(X) 1 ## X
11nopre: A(A(X))
12
13