{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"///"}]}
    /// FIXME: Your first reaction may be that this is a bit strange. `RegionBoundPairs`
    free_region_map: FreeRegionMap<'tcx>,
    /// does not contain lifetimes, which are instead in the `FreeRegionMap`, and other