syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let trait_ref = if tcx.generics_of(trait_def_id).own_params.len() == 1 {
context_before:                 let tcx = self.tcx();
context_after:                     ty::TraitRef::new(tcx, trait_def_id, [normalized_ty])