let coerce_unsized_trait = tcx.require_lang_item(LangItem::CoerceUnsized, Some(span));
let unsize_trait = tcx.lang_items().require(LangItem::Unsize).unwrap_or_else(|err| {
- tcx.sess.fatal(&format!("`CoerceUnsized` implementation {}", err));
+ tcx.sess.fatal(&format!("`CoerceUnsized` implementation {}", err.to_string()));
});
let source = tcx.type_of(impl_did);