mod func_tests {
    use std::rc::Rc;
    use std::cell::RefCell;
    use relish::ast::{Ast, Type, Ctr, new_ast};
    use relish::ast::VTable;
    use relish::ast::{Function, Operation, FTable, Args, func_declare, func_call};

    #[test]
    fn decl_and_call_internal_func() {
        let test_internal_func: Function = Function{
            name: String::from("test_func_in"),
            loose_syms: false,
            eval_lazy: true,
            args: Args::Strict(vec![Type::Bool]),
            function: Operation::Internal(
                |a: Ast, _b: Rc<RefCell<VTable>>, _c: Rc<RefCell<FTable>>| -> Ast {
                    let inner = a.borrow();
                    let mut is_bool = false;
                    if let Ctr::Bool(_) = &inner.car {
                        is_bool = true;
                    }

                    Ctr::Bool(is_bool)
                }
            )
        };
        let ft = Rc::new(RefCell::new(FTable::new()));
        let vt = Rc::new(RefCell::new(VTable::new()));
        let args = new_ast(Ctr::Bool(true), Ctr::None);
        if let Some(s) = func_declare(ft.clone(),
                                      Rc::new(RefCell::new(test_internal_func))) {
            print!("{}", s);
            assert!(false);
        }

        let func: Rc<RefCell<Function>>;
        if let Some(f) = ft.borrow().get(&"test_func_in".to_string()) {
            func = f.clone();
        } else {
            print!("failed to retrieve function!");
            assert!(false);
            return;
        }

        if let Ok(ret) = func_call(func, args, vt, ft) {
            match ret {
                Ctr::Bool(b) => assert!(b),
                _ => {
                    print!("invalid return from func!");
                    assert!(false);
                }
            }
        } else {
            print!("call to function failed!");
            assert!(false);
        }
    }
}