Destructor for scope, prevent functions with the same name as built in functions

include/ast/declaration/FunctionNode.h

@@ -3,6 +3,7 @@
 #include "ast/BlockNode.h"
 #include "ast/declaration/VariableNode.h"
 #include "ast/expression/ExpressionNode.h"
+#include "parser/BuiltIn.h"
 #include "parser/Registry.h"
 #include "parser/Scope.h"
 #include "token/Token.h"

source/ast/declaration/FunctionNode.cc

@@ -28,6 +28,12 @@ FunctionNode::~FunctionNode()
 
 Node* FunctionNode::evaluate() const
 {
+    // Check if the function is built-in
+    if (BuiltIn::functions.find(identifier) != BuiltIn::functions.end())
+    {
+        throw RuntimeError(get_location(), "Cannot overwrite built-in function: " + identifier);
+    }
+
     // Register the function in the registry
     Registry::instance().add_function(const_cast<FunctionNode*>(this));
     // Add the function to the current scope

source/parser/Scope.cc

@@ -4,7 +4,13 @@ namespace funk
 {
 
 Scope::Scope() {}
-Scope::~Scope() {}
+Scope::~Scope()
+{
+    for (auto& scope : scopes)
+    {
+        for (auto& [name, node] : scope) { delete node; }
+    }
+}
 
 Scope& Scope::instance()
 {