{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"captures:"}]}
    captures: &'tcx ty::List<&'tcx ty::CapturedPlace<'tcx>>,
    user_provided_sig: ty::CanonicalPolyFnSig<'tcx>,
    kind_origin: Option<&'tcx (Span, HirPlace<'tcx>)>,