Merge pull request #1177 from diffblue/define7

SMV: test for cyclic `DEFINE`

Author: tautschnig

regression/smv/define/define7.desc

@@ -0,0 +1,8 @@
+CORE
+define7.smv
+
+^definition of `smv::main::var::a' is cyclic$
+^EXIT=2$
+^SIGNAL=0$
+--
+--

regression/smv/define/define7.smv

@@ -0,0 +1,5 @@
+MODULE main
+
+-- a cyclic definition
+DEFINE b := a;
+DEFINE a := b;