diff --git a/src/abstract_tree/for.rs b/src/abstract_tree/for.rs
index 2197e45..24a2ed2 100644
--- a/src/abstract_tree/for.rs
+++ b/src/abstract_tree/for.rs
@@ -100,12 +100,14 @@ impl AbstractTree for For {
         if let Value::Range(range) = expression_run {
             if self.is_async {
                 range.into_par_iter().try_for_each(|integer| {
+                    self.context.add_allowance(key)?;
                     self.context
                         .set_value(key.clone(), Value::Integer(integer))?;
                     self.block.run(source, &self.context).map(|_value| ())
                 })?;
             } else {
                 for i in range {
+                    self.context.add_allowance(key)?;
                     self.context.set_value(key.clone(), Value::Integer(i))?;
                     self.block.run(source, &self.context)?;
                 }
@@ -117,6 +119,7 @@ impl AbstractTree for For {
         if let Value::List(list) = &expression_run {
             if self.is_async {
                 list.items()?.par_iter().try_for_each(|value| {
+                    self.context.add_allowance(key)?;
                     self.context.set_value(key.clone(), value.clone())?;
                     self.block.run(source, &self.context).map(|_value| ())
                 })?;
diff --git a/src/abstract_tree/value_node.rs b/src/abstract_tree/value_node.rs
index 8a31b1e..843b334 100644
--- a/src/abstract_tree/value_node.rs
+++ b/src/abstract_tree/value_node.rs
@@ -179,6 +179,13 @@ impl AbstractTree for ValueNode {
                 }
             }
             ValueNode::Map(map_node) => map_node.validate(_source, context)?,
+            ValueNode::Enum { name, variant, expression } => {
+                name.validate(_source, context)?;
+
+                if let Some(expression) = expression {
+                    expression.validate(_source, context)?;
+                }
+            }
             _ => {},
         }
 
diff --git a/tests/enums.rs b/tests/enums.rs
index fe2e13e..4fc46f5 100644
--- a/tests/enums.rs
+++ b/tests/enums.rs
@@ -56,24 +56,30 @@ fn nested_enum() {
 
 #[test]
 fn enum_with_argument() {
+    env_logger::builder().is_test(true).try_init().unwrap();
+
     let result = interpret(
         "
         enum FooBar<T> {
-            Foo<T>,
-            Bar,
+            Foo<T>
+            Bar
+        }
+        enum FizzBuzz {
+            Fizz
+            Buzz
         }
 
-        Foobar::Bar(Fizzbuzz::Fizz)
+        FooBar::Bar(FizzBuzz::Fizz)
         ",
     );
 
     assert_eq!(
         result,
         Ok(Value::Enum(EnumInstance::new(
-            Identifier::new("Foobar"),
+            Identifier::new("FooBar"),
             Identifier::new("Bar"),
             Some(Value::Enum(EnumInstance::new(
-                Identifier::new("Fizzbuzz"),
+                Identifier::new("FizzBuzz"),
                 Identifier::new("Fizz"),
                 Some(Value::none())
             )))