syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet: pub trait Printer<'tcx>: Sized {
context_before: // FIXME(eddyb) find a better name; this is more general than "printing".
context_after:     fn tcx<'a>(&'a self) -> TyCtxt<'tcx>;