Crash on attempt to create range with lower bound greater or equal to lower bound.

Better have an assert than nothing until we handle such cases properly.
As for now, if the user inputs range like [9-0], it will be tranformed
to [0-9]. Later re2c should at least warn about such cases.

diff --git a/re2c/src/util/range.h b/re2c/src/util/range.h
index b768cf23e9d08627901b5e6506be7238b391b36b..48d79f384866d0788c206a8e0a5e3cf71aa4a92f 100644 (file)
--- a/re2c/src/util/range.h
+++ b/re2c/src/util/range.h
@@ -1,6 +1,7 @@
 #ifndef _RE2C_UTIL_RANGE_
 #define _RE2C_UTIL_RANGE_
 
+#include <assert.h>
 #include <stddef.h> // NULL
 
 #include "src/util/c99_stdint.h"
@@ -27,6 +28,7 @@ public:
                , lb (l)
                , ub (u)
        {
+               assert (lb < ub);
                vFreeList.insert (this);
        }
        ~Range ()