/* Concatenate arguments. _XBT_CONCAT2 adds a level of indirection over _XBT_CONCAT. */
#define _XBT_CONCAT(a, b) a##b
#define _XBT_CONCAT2(a, b) _XBT_CONCAT(a, b)
/* Concatenate arguments. _XBT_CONCAT2 adds a level of indirection over _XBT_CONCAT. */
#define _XBT_CONCAT(a, b) a##b
#define _XBT_CONCAT2(a, b) _XBT_CONCAT(a, b)
-#define _XBT_CONCAT3(a, b, c) _XBT_CONCAT2(_XBT_CONCAT(a, b), c)
+#define _XBT_CONCAT3(a, b, c) _XBT_CONCAT2(_XBT_CONCAT2(a, b), c)
#define _XBT_CONCAT4(a, b, c, d) _XBT_CONCAT2(_XBT_CONCAT3(a, b, c), d)
/*
#define _XBT_CONCAT4(a, b, c, d) _XBT_CONCAT2(_XBT_CONCAT3(a, b, c), d)
/*