syntax_data: {"ast_node_type":"other","tokens":[{"end":21,"kind":"keyword","start":0,"text":"ClosureArgs"}]}
source_snippet:         ClosureArgs {
context_before:     pub fn new(cx: I, parts: ClosureArgsParts<I>) -> ClosureArgs<I> {
context_after:             args: cx.mk_args_from_iter(parts.parent_args.iter().chain([