1   /* { dg-options "-ftrack-macro-expansion=2" } */
       2  /* { dg-do preprocess } */
       3  
       4  #define do_paste 1.0e ## -1
       5  
       6  do_paste
       7  
       8  /* { dg-final {scan-file paste17.i "1.0e- 1" } }*/