syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"ty::Error(_)"}]}
source_snippet:         ty::Error(_) => Some(SimplifiedType::Error),
context_before:         ty::Foreign(def_id) => Some(SimplifiedType::Foreign(def_id)),
context_after:         ty::Bound(..) | ty::Infer(_) => None,