gcc-4.8/gcc/testsuite/gcc.dg/cpp/paste17.c


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 /* { dg-options "-ftrack-macro-expansion=2" } */
/* { dg-do preprocess } */

#define do_paste 1.0e ## -1

do_paste

/* { dg-final {scan-file paste17.i "1.0e- 1" } }*/