syntax_data: {"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":"ty::tls::with(|tcx|"}]}
source_snippet:         ty::tls::with(|tcx| {
context_before:     fn print(t: &T, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
context_after:             let mut p = FmtPrinter::new(tcx, Namespace::TypeNS);