#define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g. */
#define REXEC_ML 0x20 /* $* was set. */
-#define ReREFCNT_inc(re) ((re && re->refcnt++), re)
+#define ReREFCNT_inc(re) ((void)(re && re->refcnt++), re)
#define ReREFCNT_dec(re) CALLREGFREE(aTHX_ re)
#define FBMcf_TAIL_DOLLAR 1