syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"ty::Binder::dummy(from).upcast(tcx)"}]}
source_snippet:         ty::Binder::dummy(from).upcast(tcx)
context_before:     fn upcast_from(from: TraitRef<'tcx>, tcx: TyCtxt<'tcx>) -> Self {
context_after:     }