syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"type"}]}
source_snippet:     type Error = NormalizationError<'tcx>;
context_before: impl<'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for TryNormalizeAfterErasingRegionsFolder<'tcx> {