{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"${ignore($flat_map_ast_elt)}"}]}
                        ${ignore($flat_map_ast_elt)}
                    $($(AstFragment::$Kind(ast) => ast.extend(placeholders.iter().flat_map(|id| {
                        placeholder(AstFragmentKind::$Kind, *id, None).$make_ast()