1  /* PR preprocessor/20077 */
       2  /* { dg-do preprocess } */
       3  
       4  #define a   a ## ## /* { dg-error "end of a macro expansion" } */
       5  #define b() b ## ## /* { dg-error "end of a macro expansion" } */
       6  #define c   c ##    /* { dg-error "end of a macro expansion" } */
       7  #define d() d ##    /* { dg-error "end of a macro expansion" } */
       8  
       9  
      10  #define e   ## ## e /* { dg-error "end of a macro expansion" } */
      11  #define f() ## ## f /* { dg-error "end of a macro expansion" } */
      12  #define g   ## g    /* { dg-error "end of a macro expansion" } */
      13  #define h() ## h    /* { dg-error "end of a macro expansion" } */
      14  #define i   ##      /* { dg-error "end of a macro expansion" } */
      15  #define j() ##      /* { dg-error "end of a macro expansion" } */