37     pub fn tokens_helper<F: Fold + ?Sized, S: Spans>(folder: &mut F, spans: &S) -> S {  in tokens_helper()
41     pub trait Spans {  trait
45     impl Spans for Span {
51     impl Spans for [Span; 1] {  impl
57     impl Spans for [Span; 2] {  impl
63     impl Spans for [Span; 3] {  impl
79     pub fn tokens_helper<'ast, V: Visit<'ast> + ?Sized, S: Spans>(visitor: &mut V, spans: &S) {  in tokens_helper()
83     pub trait Spans {  trait
87     impl Spans for Span {
93     impl Spans for [Span; 1] {  impl
99     impl Spans for [Span; 2] {  impl
106     impl Spans for [Span; 3] {  impl
120     pub fn tokens_helper<V: VisitMut + ?Sized, S: Spans>(visitor: &mut V, spans: &mut S) {  in tokens_helper()
124     pub trait Spans {  interface
128     impl Spans for Span {
134     impl Spans for [Span; 1] {  impl
140     impl Spans for [Span; 2] {  impl
147     impl Spans for [Span; 3] {  impl