syntax_data: {"ast_node_type":"function","tokens":[{"end":85,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn visit_binder<T: TypeVisitable<TyCtxt<'tcx>>>(&mut self, t: &Binder<'tcx, T>) {
context_before: impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for LateBoundRegionsCollector {
context_after:         self.current_index.shift_in(1);