let Impl { of_trait: Some(of_trait), .. } = impl_ &&
let Some(def_id) = of_trait.trait_def_id() &&
let Some(name) = cx.tcx.get_diagnostic_name(def_id) &&
let Impl { of_trait: Some(of_trait), .. } = impl_ &&
let Some(def_id) = of_trait.trait_def_id() &&
let Some(name) = cx.tcx.get_diagnostic_name(def_id) &&