{"ast_node_type":"function","tokens":[{"end":84,"kind":"keyword","start":0,"text":"///"}]}
///     fn f1(s: S);             // res=Param, name='_, source=Path, syntax=Implicit
/// unsafe extern "C" {
///     fn f2(s: S<'_>);         // res=Param, name='_, source=Path, syntax=ExplicitAnonymous