Fix features.

tests/data_size.rs

@@ -35,6 +35,7 @@ fn test_max_string_size() -> Result<(), Box<EvalAltResult>> {
         EvalAltResult::ErrorDataTooLarge(_, 10, 13, _)
     ));
 
+    #[cfg(not(feature = "no_object"))]
     assert!(matches!(
         *engine
             .eval::<String>(
@@ -92,6 +93,8 @@ fn test_max_array_size() -> Result<(), Box<EvalAltResult>> {
             .expect_err("should error"),
         EvalAltResult::ErrorDataTooLarge(_, 10, 12, _)
     ));
+
+    #[cfg(not(feature = "no_object"))]
     assert!(matches!(
         *engine
             .eval::<Array>(

tests/for.rs

@@ -39,7 +39,7 @@ fn test_for_string() -> Result<(), Box<EvalAltResult>> {
         let sum = 0;
 
         for ch in s {
-            sum += ch.to_int();
+            sum += to_int(ch);
         }
 
         sum

tests/functions.rs

@@ -52,6 +52,7 @@ fn test_functions() -> Result<(), Box<EvalAltResult>> {
 }
 
 #[test]
+#[cfg(not(feature = "no_object"))]
 fn test_function_pointers() -> Result<(), Box<EvalAltResult>> {
     let engine = Engine::new();