got type system working

examples/strings.bl

@@ -1,11 +1,6 @@
 fn main(): String {
-  let a = 2;
-  a;
-  a = 3;
-  a = if(true) {"asdf"} else {"fdsa"};
-  a.b.c.d();
-  a = (b + c.d()); // comment
-  return a.b() ;
+  let a = "asdf";
+  return a ;
 }
 
 type User struct {
@@ -23,7 +18,7 @@ impl TestTrait for User {
         return Self{id: id};
     }
     fn instance_method(self: Self): i64 {
-        return self.get_id();
+        return self.id;
     }
     fn default_impl(self: Self): i64 {
         return self.instance_method();