syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"ty::Dynamic(trait_ty,"}]}
source_snippet:             ty::Dynamic(trait_ty, region, representation) => ty::Dynamic(
context_before:             ty::Adt(tid, args) => ty::Adt(tid, args.try_fold_with(folder)?),
context_after:                 trait_ty.try_fold_with(folder)?,