syntax_data: {"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let def_id = trait_ref.def_id;
context_before:                 if let ty::ExistentialPredicate::Trait(ref trait_ref) = predicate.skip_binder() {
context_after:                     let descr_post = &format!(" trait object{}{}", plural_suffix, data.descr_post);