Fix assignment to contract member access

test/libsolidity/smtCheckerTests/operators/assignment_contract_member_variable.sol

@@ -0,0 +1,30 @@
+pragma experimental SMTChecker;
+contract A {
+	int x;
+	int y;
+	function a() public {
+		require(A.x < 100);
+		A.y = A.x++;
+		assert(A.y == A.x - 1);
+		// Fails
+		assert(A.y == 0);
+		A.y = ++A.x;
+		assert(A.y == A.x);
+		delete A.x;
+		assert(A.x == 0);
+		A.y = A.x--;
+		assert(A.y == A.x + 1);
+		assert(A.y == 0);
+		A.y = --A.x;
+		assert(A.y == A.x);
+		A.x += 10;
+		// Fails
+		assert(A.y == 0);
+		assert(A.y + 10 == A.x);
+		A.x -= 10;
+		assert(A.y == A.x);
+	}
+}
+// ----
+// Warning 6328: (160-176): CHC: Assertion violation happens here.
+// Warning 6328: (373-389): CHC: Assertion violation happens here.

test/libsolidity/smtCheckerTests/operators/assignment_contract_member_variable_array.sol

@@ -0,0 +1,14 @@
+pragma experimental SMTChecker;
+contract A {
+	uint[] a;
+	function f() public {
+		A.a.push(2);
+		assert(A.a[A.a.length - 1] == 2);
+		A.a.pop();
+		// Fails
+		assert(A.a.length > 0);
+		assert(A.a.length == 0);
+	}
+}
+// ----
+// Warning 6328: (156-178): CHC: Assertion violation happens here.

test/libsolidity/smtCheckerTests/operators/assignment_module_contract_member_variable.sol

@@ -0,0 +1,31 @@
+==== Source: AASource ====
+pragma experimental SMTChecker;
+import "AASource" as AA;
+contract A {
+	int x;
+	int y;
+	function a() public {
+		require(A.x < 100);
+		AA.A.y = A.x++;
+		assert(A.y == AA.A.x - 1);
+		// Fails
+		assert(AA.A.y == 0);
+		A.y = ++AA.A.x;
+		assert(A.y == A.x);
+		delete AA.A.x;
+		assert(A.x == 0);
+		A.y = A.x--;
+		assert(AA.A.y == AA.A.x + 1);
+		A.y = --A.x;
+		assert(A.y == A.x);
+		AA.A.x += 10;
+		// Fails
+		assert(A.y == 0);
+		assert(A.y + 10 == A.x);
+		A.x -= 10;
+		assert(AA.A.y == A.x);
+	}
+}
+// ----
+// Warning 6328: (AASource:191-210): CHC: Assertion violation happens here.
+// Warning 6328: (AASource:402-418): CHC: Assertion violation happens here.