Merge pull request #982 from diffblue/define2

SMV: do not allow defining identifiers that are already declared

Author: kroening

regression/smv/assign/assign1.desc

@@ -0,0 +1,8 @@
+KNOWNBUG
+assign1.smv
+
+^file .* line 6: variable `x' already assigned.*$
+^EXIT=1$
+^SIGNAL=0$
+--
+--

regression/smv/assign/assign1.smv

@@ -0,0 +1,8 @@
+MODULE main
+
+VAR x : 1..4;
+
+ASSIGN x := 1;
+
+-- not allowed, x is already assigned
+ASSIGN init(x) := 2;

regression/smv/assign/assign2.desc

@@ -0,0 +1,8 @@
+KNOWNBUG
+assign1.smv
+
+^file .* line 6: variable `x' already assigned.*$
+^EXIT=1$
+^SIGNAL=0$
+--
+--

regression/smv/assign/assign2.smv

@@ -0,0 +1,8 @@
+MODULE main
+
+VAR x : 1..4;
+
+ASSIGN x := 1;
+
+-- not allowed, x is already assigned
+ASSIGN next(x) := 2;

regression/smv/define/define2.desc

@@ -0,0 +1,8 @@
+CORE
+define2.smv
+
+^file .* line 6: variable `x' already declared.*$
+^EXIT=1$
+^SIGNAL=0$
+--
+--

regression/smv/define/define2.smv

@@ -0,0 +1,6 @@
+MODULE main
+
+VAR x : boolean;
+
+-- not allowed, x is already a variable
+DEFINE x := TRUE;

regression/smv/define/define3.desc

@@ -0,0 +1,8 @@
+CORE
+define3.smv
+
+^file .* line 6: variable `x' already defined.*$
+^EXIT=1$
+^SIGNAL=0$
+--
+--

regression/smv/define/define3.smv

@@ -0,0 +1,6 @@
+MODULE main
+
+DEFINE x := TRUE;
+
+-- not allowed, x is already defined
+VAR x : boolean;

regression/smv/define/define4.desc

@@ -0,0 +1,8 @@
+CORE
+define4.smv
+
+^file .* line 6: variable `x' already defined.*$
+^EXIT=1$
+^SIGNAL=0$
+--
+--

regression/smv/define/define4.smv

@@ -0,0 +1,6 @@
+MODULE main
+
+DEFINE x := TRUE;
+
+-- not allowed, x is already defined
+ASSIGN x := TRUE;