{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
        // We have "NLL problem case #3" here, which cannot be worked around without loss of
    ) -> InterpResult<'tcx, (&mut Allocation<M::Provenance, M::AllocExtra, M::Bytes>, &mut M)> {
        // efficiency even for the common case where the key is in the map.