syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"ty::ReBound(debruijn,"}]}
source_snippet:             ty::ReBound(debruijn, region) => Region::new_bound(tcx, debruijn, region),
context_before:             ty::ReEarlyParam(region) => Region::new_early_param(tcx, region),
context_after:             ty::ReLateParam(ty::LateParamRegion { scope, kind }) => {