syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"&args[..parent_args.len()"}]}
source_snippet:                                     &args[..parent_args.len() + 1][..1],
context_before:                                     |p| p.print_def_path(def_id, parent_args),
context_after:                                 );