handle nesting classes in functions

Author: withinboredom

Zend/zend_compile.c

@@ -9157,6 +9157,12 @@ static void zend_compile_enum_backing_type(zend_class_entry *ce, zend_ast *enum_
 HashTable *inner_class_queue = NULL;
 
 static void zend_defer_class_decl(zend_ast *ast) {
+	ZEND_ASSERT(CG(active_class_entry));
+
+	if (CG(active_op_array)->function_name) {
+		zend_error_noreturn(E_COMPILE_ERROR, "Class declarations may not be declared inside functions");
+	}
+
 	if (inner_class_queue == NULL) {
 		ALLOC_HASHTABLE(inner_class_queue);
 		zend_hash_init(inner_class_queue, 8, NULL, ZVAL_PTR_DTOR, 0);