syntax_data: {"ast_node_type":"function","tokens":[{"end":34,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn cx(&self) -> TyCtxt<'tcx> {
context_before: impl<'a, 'tcx> ty::TypeFolder<TyCtxt<'tcx>> for RegionFolder<'a, 'tcx> {
context_after:         self.tcx