Merge pull request #1384 from diffblue/smv_ltlspec_X1

SMV: test for precedence of X vs &

Author: tautschnig

regression/smv/LTL/smv_ltlspec_X1.desc

@@ -0,0 +1,10 @@
+CORE
+smv_ltlspec_X1.smv
+
+^\[.*\] X x & x: REFUTED$
+^\[.*\] X x & x: REFUTED$
+^\[.*\] X \(x & x\): PROVED \(CT=1\)$
+^EXIT=10$
+^SIGNAL=0$
+--
+^warning: ignoring

regression/smv/LTL/smv_ltlspec_X1.smv

@@ -0,0 +1,11 @@
+MODULE main
+
+VAR x : boolean;
+
+ASSIGN next(x) := TRUE;
+       init(x) := FALSE;
+
+-- X binds stronger than &
+LTLSPEC X x & x -- should parse as (X x) & x
+LTLSPEC (X x) & x -- should fail
+LTLSPEC X (x & x) -- should pass