{"ast_node_type":"impl","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
    // of the `impl Sized`. Insert that here, so we don't ICE later.
    // and when walking through the signature we end up never collecting the def id
    for assoc_item in tcx.associated_types_for_impl_traits_in_associated_fn(trait_m.def_id) {