syntax_data: {"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"ty::tls::with(|tcx|"}]}
source_snippet:                 ty::tls::with(|tcx| {
context_before:             fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
context_after:                     let mut p = FmtPrinter::new(tcx, Namespace::TypeNS);