syntax_data: {"ast_node_type":"function","tokens":[{"end":62,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn input(self, index: usize) -> ty::Binder<I, I::Ty> {
context_before:     #[track_caller]
context_after:         self.map_bound(|fn_sig| fn_sig.inputs().get(index).unwrap())