syntax_data: {"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"ty::ImplTraitInTraitData::Impl"}]}
source_snippet:                 ty::ImplTraitInTraitData::Impl { .. } => {
context_before:                 // the assumed wf types of the trait's RPITIT GAT.
context_after:                     let impl_def_id = tcx.local_parent(def_id);