Harden Ty constructors a bit in debug mode

`Ty::new` wasn't used anywhere outside this module

`Ty::new_adt` shouldn't ever be used for anything but adts. This hasn't caught any bugs, but seems good to check anyway

compiler/rustc_middle/src/ty/sty.rs

@@ -401,7 +401,7 @@ impl<'tcx> Ty<'tcx> {
     /// The more specific methods will often optimize their creation.
     #[allow(rustc::usage_of_ty_tykind)]
     #[inline]
-    pub fn new(tcx: TyCtxt<'tcx>, st: TyKind<'tcx>) -> Ty<'tcx> {
+    fn new(tcx: TyCtxt<'tcx>, st: TyKind<'tcx>) -> Ty<'tcx> {
         tcx.mk_ty_from_kind(st)
     }
 
@@ -613,6 +613,41 @@ impl<'tcx> Ty<'tcx> {
     #[inline]
     pub fn new_adt(tcx: TyCtxt<'tcx>, def: AdtDef<'tcx>, args: GenericArgsRef<'tcx>) -> Ty<'tcx> {
         tcx.debug_assert_args_compatible(def.did(), args);
+        if cfg!(debug_assertions) {
+            match tcx.def_kind(def.did()) {
+                DefKind::Struct | DefKind::Union | DefKind::Enum => {}
+                DefKind::Mod
+                | DefKind::Variant
+                | DefKind::Trait
+                | DefKind::TyAlias
+                | DefKind::ForeignTy
+                | DefKind::TraitAlias
+                | DefKind::AssocTy
+                | DefKind::TyParam
+                | DefKind::Fn
+                | DefKind::Const
+                | DefKind::ConstParam
+                | DefKind::Static { .. }
+                | DefKind::Ctor(..)
+                | DefKind::AssocFn
+                | DefKind::AssocConst
+                | DefKind::Macro(..)
+                | DefKind::ExternCrate
+                | DefKind::Use
+                | DefKind::ForeignMod
+                | DefKind::AnonConst
+                | DefKind::InlineConst
+                | DefKind::OpaqueTy
+                | DefKind::Field
+                | DefKind::LifetimeParam
+                | DefKind::GlobalAsm
+                | DefKind::Impl { .. }
+                | DefKind::Closure
+                | DefKind::SyntheticCoroutineBody => {
+                    bug!("not an adt: {def:?} ({:?})", tcx.def_kind(def.did()))
+                }
+            }
+        }
         Ty::new(tcx, Adt(def, args))
     }
 
@@ -772,7 +807,7 @@ impl<'tcx> Ty<'tcx> {
                 }
             }
         });
-        Ty::new(tcx, Adt(adt_def, args))
+        Ty::new_adt(tcx, adt_def, args)
     }
 
     #[inline]