syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"Ok(ty)"}]}
source_snippet:                         Ok(ty) => ty::Binder::dummy(AutoImplConstituents {
context_before:                     match self.tcx().type_of_opaque(def_id) {
context_after:                             types: vec![ty.instantiate(self.tcx(), args)],