syntax_data: {"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"where"}]}
source_snippet:     where
context_before:     fn prepare_region_info<T>(&mut self, value: &ty::Binder<'tcx, T>)
context_after:         T: TypeFoldable<TyCtxt<'tcx>>,