syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"tcx:"}]}
source_snippet:     tcx: TyCtxt<'tcx>,
context_before: pub fn object_region_bounds<'tcx>(
context_after:     existential_predicates: &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,