Style: Replace header guards with #pragma once

core/templates/list.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef LIST_H
-#define LIST_H
+#pragma once
 
 #include "core/error/error_macros.h"
 #include "core/os/memory.h"
@@ -829,5 +828,3 @@ void List<T, A>::Element::transfer_to_back(List<T, A> *p_dst_list) {
 	data = p_dst_list->_data;
 	p_dst_list->_data->size_cache++;
 }
-
-#endif // LIST_H