13 lines · c
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 X6pre: A(A(X))7 8/* The ## operator disables preexpansion. */9#undef A10#define A(X) 1 ## X11nopre: A(A(X))12 13