Check

test.c

			if (file_ast->children > 0 && !(
				file_ast->child[0] == ast // First statement in the file
				|| ( // after a non-block namespace declaration
					file_ast->child[0]->kind == ZEND_AST_NAMESPACE 
					&& file_ast->child[0]->child[1] == NULL // non-block mode namespace declaration
					&& file_ast->child[1] == ast
				))) {
				zend_error_noreturn(E_COMPILE_ERROR, "Encoding declaration pragma must be "
					"the very first statement in the script");
			}