Fix bugs, add propper tests

src/parser/ast/mod.rs

@@ -19,7 +19,7 @@ pub struct Scope {
     pub inner_scope: Option<Box<Scope>>
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Default)]
 pub struct Program {
     pub ast: expr::Block,
     pub structs: HashMap<Ident, LocBox<Struct>>,
@@ -32,7 +32,9 @@ pub struct Program {
     pub literals: HashMap<String, Literal>, // string is id of literal
     pub struct_literals: HashMap<String, StructLit>, // string is id of literal
     pub scope: Option<Scope>,
-    pub curr_fn_args: HashMap<Ident, LocBox<Type>>
+    pub curr_fn_args: HashMap<Ident, LocBox<Type>>,
+    pub curr_struct: Option<Ident>,
+    pub included_files: Vec<String>,
 }