{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon),"}]}
        ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon),
    let bound_vars = tcx.mk_bound_variable_kinds(&[
        ty::BoundVariableKind::Region(ty::BoundRegionKind::Anon),