syntax_data: {"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let args = relate_args_invariantly(relation, a.args, b.args)?;
context_before:         } else {
context_after:             Ok(ty::TraitRef::new_from_args(relation.cx(), a.def_id, args))