1 /* Regression test for preprocessor crash.
2    Reported by Mathias Froehlich <frohlich@na.uni-tuebingen.de>.  */
3 /* { dg-do preprocess } */
4 /* { dg-options "-ansi" } */
5 #define foo
6 
7 #define __CAT__(a,b,c,d) a##b##c##d
8 #define CAT(a,b,c,d) __CAT__(a,b,c,d)
9 
10 #define bar CAT(,foo,bar,)
11 bar
12