diff --git a/compiler/rustc_smir/src/rustc_smir/mod.rs b/compiler/rustc_smir/src/rustc_smir/mod.rs
index f22c620021eeb..e2376f4865351 100644
--- a/compiler/rustc_smir/src/rustc_smir/mod.rs
+++ b/compiler/rustc_smir/src/rustc_smir/mod.rs
@@ -96,9 +96,11 @@ impl<'tcx> Tables<'tcx> {
             },
             ty::Adt(_, _) => todo!(),
             ty::Foreign(_) => todo!(),
-            ty::Str => todo!(),
-            ty::Array(_, _) => todo!(),
-            ty::Slice(_) => todo!(),
+            ty::Str => TyKind::RigidTy(RigidTy::Str),
+            ty::Array(ty, constant) => {
+                TyKind::RigidTy(RigidTy::Array(self.intern_ty(*ty), opaque(constant)))
+            }
+            ty::Slice(ty) => TyKind::RigidTy(RigidTy::Slice(self.intern_ty(*ty))),
             ty::RawPtr(_) => todo!(),
             ty::Ref(_, _, _) => todo!(),
             ty::FnDef(_, _) => todo!(),
diff --git a/compiler/rustc_smir/src/stable_mir/ty.rs b/compiler/rustc_smir/src/stable_mir/ty.rs
index 3181af46e9cb3..f43d8a2cb9a1d 100644
--- a/compiler/rustc_smir/src/stable_mir/ty.rs
+++ b/compiler/rustc_smir/src/stable_mir/ty.rs
@@ -1,4 +1,7 @@
 use super::with;
+use crate::rustc_internal::Opaque;
+
+type Const = Opaque;
 
 #[derive(Copy, Clone, Debug)]
 pub struct Ty(pub usize);
@@ -21,6 +24,9 @@ pub enum RigidTy {
     Int(IntTy),
     Uint(UintTy),
     Float(FloatTy),
+    Str,
+    Array(Ty, Const),
+    Slice(Ty),
     Tuple(Vec<Ty>),
 }