fix: ensure free function are not impacted by the injection of world …

…and self (#1733)

* fix: ensure free function are not impacted by the injection of world and self

* fix: rewrite functions only in impl that target ContractState

.gitignore

@@ -16,3 +16,4 @@ output.txt
 crates/benches/bench_results.txt
 **/generated
 .vscode
+bindings

crates/dojo-lang/src/contract.rs

@@ -41,10 +41,13 @@ impl DojoContract {
                             has_storage = true;
                             return system.merge_storage(db, struct_ast.clone());
                         }
-                    } else if let ast::ModuleItem::FreeFunction(fn_ast) = el {
-                        return system.rewrite_function(db, fn_ast.clone());
                     } else if let ast::ModuleItem::Impl(impl_ast) = el {
-                        return system.rewrite_impl(db, impl_ast.clone());
+                        // If an implementation is not targetting the ContractState,
+                        // the auto injection of self and world is not applied.
+                        let trait_path = impl_ast.trait_path(db).node.get_text(db);
+                        if trait_path.contains("<ContractState>") {
+                            return system.rewrite_impl(db, impl_ast.clone());
+                        }
                     }
 
                     vec![RewriteNode::Copied(el.as_syntax_node())]