ported rewrite2 to c3

test/test_bitsruct.c3

@@ -0,0 +1,14 @@
+bitstruct Bits : uint {
+	bool a : 0;
+	bool b : 1;
+	bool c : 2;
+}
+
+fn int main()
+{
+	Bits a = {false, true, false};
+	Bits b = {true, true, false};
+	Bits c = a | b;
+
+	return 0;
+}