syntax_data: {"ast_node_type":"function","tokens":[{"end":92,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet: fn construct_error(tcx: TyCtxt<'_>, def_id: LocalDefId, guar: ErrorGuaranteed) -> Body<'_> {
context_before: /// with type errors, but normal MIR construction can't handle that in general.
context_after:     let span = tcx.def_span(def_id);