syntax_data: {"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":"ty::TraitPredicate<'tcx>,"}]}
source_snippet:     ty::TraitPredicate<'tcx>,
context_before: pub struct TraitPredPrintWithBoundConstness<'tcx>(
context_after:     Option<ty::BoundConstness>,