syntax_data: {"ast_node_type":"function","tokens":[{"end":80,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn new_error(tcx: TyCtxt<'tcx>, guar: ErrorGuaranteed) -> Region<'tcx> {
context_before:     #[track_caller]
context_after:         tcx.intern_region(ty::ReError(guar))