fix ptr_metadata_ty for DynStar type

Author: RalfJung

compiler/rustc_middle/src/ty/sty.rs

@@ -2735,6 +2735,8 @@ impl<'tcx> Ty<'tcx> {
             | ty::Error(_)
             // Extern types have metadata = ().
             | ty::Foreign(..)
+            // `dyn*` has no metadata
+            | ty::Dynamic(_, _, DynKind::DynStar)
             // If returned by `struct_tail_without_normalization` this is a unit struct
             // without any fields, or not a struct, and therefore is Sized.
             | ty::Adt(..)
@@ -2743,7 +2745,7 @@ impl<'tcx> Ty<'tcx> {
             | ty::Tuple(..) => (tcx.types.unit, false),
 
             ty::Str | ty::Slice(_) => (tcx.types.usize, false),
-            ty::Dynamic(..) => {
+            ty::Dynamic(_, _, DynKind::Dyn) => {
                 let dyn_metadata = tcx.require_lang_item(LangItem::DynMetadata, None);
                 (tcx.type_of(dyn_metadata).instantiate(tcx, &[tail.into()]), false)
             },