syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"ty::Dynamic(trait_ty,"}]}
source_snippet:             ty::Dynamic(trait_ty, region, representation) => {
context_before:             ty::Adt(tid, args) => ty::Adt(tid, args.fold_with(folder)),
context_after:                 ty::Dynamic(trait_ty.fold_with(folder), region.fold_with(folder), representation)