syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // see `BinderLevel` for more details.
context_before:             // Bound lifetimes use indices starting at 1,
context_after:             ty::ReBound(debruijn, ty::BoundRegion { var, kind: ty::BoundRegionKind::Anon }) => {