syntax_data: {"ast_node_type":"other","tokens":[{"end":13,"kind":"keyword","start":0,"text":"where"}]}
source_snippet:         where
context_before:         impl<'tcx, F> TypeVisitor<TyCtxt<'tcx>> for RegionVisitor<F>
context_after:             F: FnMut(ty::Region<'tcx>) -> bool,