added unary ops and control flow for parser

data/err.lang

@@ -29,3 +29,6 @@ fn test() {
 fn test2() {
     let a anerit;
 }
+
+fn test3() {
+    let x = 3

data/test.lang

@@ -1,4 +1,4 @@
 fn main() {
-    let x = 3;
+    let x = &"Hello World!";
     print(x);
 }