syntax_data: {"ast_node_type":"function","tokens":[{"end":91,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn from_cycle_error(tcx: TyCtxt<'tcx>, _: &CycleError, guar: ErrorGuaranteed) -> Self {
context_before: impl<'tcx> Value<TyCtxt<'tcx>> for Ty<'_> {
context_after:         // SAFETY: This is never called when `Self` is not `Ty<'tcx>`.