scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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0035-cpp.c (204B)

      1 /*
      2 PATTERN:
      3 0035-cpp.c:8: error: '##' cannot appear at either ends of a macro expansion
      4 0035-cpp.c:9: error: '##' cannot appear at either ends of a macro expansion
      5 .
      6 */
      7 
      8 #define M(x) x##
      9 #define N(x) ##x