Use span_bug in case of unexpected rib kind

Extremely minor QOL change to improve the ICE output in case this
default match case is encountered (an unexpected rib kind).

Author: Jordan McQueen

compiler/rustc_resolve/src/late.rs

@@ -2111,7 +2111,7 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
             let res = match kind {
                 ItemRibKind(..) | AssocItemRibKind => Res::Def(def_kind, def_id.to_def_id()),
                 NormalRibKind => Res::Err,
-                _ => bug!("Unexpected rib kind {:?}", kind),
+                _ => span_bug!(param.ident.span, "Unexpected rib kind {:?}", kind),
             };
             self.r.record_partial_res(param.id, PartialRes::new(res));
             rib.bindings.insert(ident, res);