8 files changed, 29 insertions, 40 deletions

diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index cdb54eca2..1c31e29ac 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -1547,7 +1547,7 @@ impl Type {
     }
 
     pub fn is_unit(&self) -> bool {
-        matches!(self.ty.value, Ty::Tuple { cardinality: 0, .. })
+        matches!(self.ty.value, Ty::Tuple(0, ..))
     }
     pub fn is_bool(&self) -> bool {
         matches!(self.ty.value, Ty::Scalar(Scalar::Bool))
@@ -1741,7 +1741,7 @@ impl Type {
     }
 
     pub fn tuple_fields(&self, _db: &dyn HirDatabase) -> Vec<Type> {
-        if let Ty::Tuple { substs, .. } = &self.ty.value {
+        if let Ty::Tuple(_, substs) = &self.ty.value {
             substs.iter().map(|ty| self.derived(ty.clone())).collect()
         } else {
             Vec::new()
diff --git a/crates/hir_ty/src/display.rs b/crates/hir_ty/src/display.rs
index cd9dcf6c0..4a25a49e3 100644
--- a/crates/hir_ty/src/display.rs
+++ b/crates/hir_ty/src/display.rs
@@ -330,7 +330,7 @@ impl HirDisplay for Ty {
                     write!(f, "{}", ty_display)?;
                 }
             }
-            Ty::Tuple { substs, .. } => {
+            Ty::Tuple(_, substs) => {
                 if substs.len() == 1 {
                     write!(f, "(")?;
                     substs[0].hir_fmt(f)?;
@@ -471,14 +471,9 @@ impl HirDisplay for Ty {
                     projection_ty.hir_fmt(f)?;
                 }
             }
-            Ty::ForeignType(type_alias, parameters) => {
+            Ty::ForeignType(type_alias) => {
                 let type_alias = f.db.type_alias_data(*type_alias);
                 write!(f, "{}", type_alias.name)?;
-                if parameters.len() > 0 {
-                    write!(f, "<")?;
-                    f.write_joined(&*parameters.0, ", ")?;
-                    write!(f, ">")?;
-                }
             }
             Ty::OpaqueType(opaque_ty_id, parameters) => {
                 match opaque_ty_id {
diff --git a/crates/hir_ty/src/infer/expr.rs b/crates/hir_ty/src/infer/expr.rs
index 2369c9bef..13240f790 100644
--- a/crates/hir_ty/src/infer/expr.rs
+++ b/crates/hir_ty/src/infer/expr.rs
@@ -82,7 +82,7 @@ impl<'a> InferenceContext<'a> {
             arg_tys.push(arg);
         }
         let parameters = param_builder.build();
-        let arg_ty = Ty::Tuple { cardinality: num_args as u16, substs: parameters };
+        let arg_ty = Ty::Tuple(num_args, parameters);
         let substs =
             Substs::build_for_generics(&generic_params).push(ty.clone()).push(arg_ty).build();
 
@@ -424,7 +424,7 @@ impl<'a> InferenceContext<'a> {
                     },
                 )
                 .find_map(|derefed_ty| match canonicalized.decanonicalize_ty(derefed_ty.value) {
-                    Ty::Tuple { substs, .. } => {
+                    Ty::Tuple(_, substs) => {
                         name.as_tuple_index().and_then(|idx| substs.0.get(idx).cloned())
                     }
                     Ty::Adt(AdtId::StructId(s), parameters) => {
@@ -635,7 +635,7 @@ impl<'a> InferenceContext<'a> {
             }
             Expr::Tuple { exprs } => {
                 let mut tys = match &expected.ty {
-                    Ty::Tuple { substs, .. } => substs
+                    Ty::Tuple(_, substs) => substs
                         .iter()
                         .cloned()
                         .chain(repeat_with(|| self.table.new_type_var()))
@@ -648,7 +648,7 @@ impl<'a> InferenceContext<'a> {
                     self.infer_expr_coerce(*expr, &Expectation::has_type(ty.clone()));
                 }
 
-                Ty::Tuple { cardinality: tys.len() as u16, substs: Substs(tys.into()) }
+                Ty::Tuple(tys.len(), Substs(tys.into()))
             }
             Expr::Array(array) => {
                 let elem_ty = match &expected.ty {
diff --git a/crates/hir_ty/src/infer/pat.rs b/crates/hir_ty/src/infer/pat.rs
index e96e08c3c..a318e47f3 100644
--- a/crates/hir_ty/src/infer/pat.rs
+++ b/crates/hir_ty/src/infer/pat.rs
@@ -138,7 +138,7 @@ impl<'a> InferenceContext<'a> {
                 inner_tys.extend(expectations_iter.by_ref().take(n_uncovered_patterns).cloned());
                 inner_tys.extend(post.iter().zip(expectations_iter).map(infer_pat));
 
-                Ty::Tuple { cardinality: inner_tys.len() as u16, substs: Substs(inner_tys.into()) }
+                Ty::Tuple(inner_tys.len(), Substs(inner_tys.into()))
             }
             Pat::Or(ref pats) => {
                 if let Some((first_pat, rest)) = pats.split_first() {
diff --git a/crates/hir_ty/src/lib.rs b/crates/hir_ty/src/lib.rs
index 117d69f01..4c0ebcfe3 100644
--- a/crates/hir_ty/src/lib.rs
+++ b/crates/hir_ty/src/lib.rs
@@ -120,7 +120,7 @@ pub enum Ty {
     Scalar(Scalar),
 
     /// A tuple type.  For example, `(i32, bool)`.
-    Tuple { cardinality: u16, substs: Substs },
+    Tuple(usize, Substs),
 
     /// An array with the given length. Written as `[T; n]`.
     Array(Substs),
@@ -169,7 +169,7 @@ pub enum Ty {
     Closure { def: DefWithBodyId, expr: ExprId, substs: Substs },
 
     /// Represents a foreign type declared in external blocks.
-    ForeignType(TypeAliasId, Substs),
+    ForeignType(TypeAliasId),
 
     /// A pointer to a function.  Written as `fn() -> i32`.
     ///
@@ -582,7 +582,7 @@ impl TypeWalk for FnSig {
 
 impl Ty {
     pub fn unit() -> Self {
-        Ty::Tuple { cardinality: 0, substs: Substs::empty() }
+        Ty::Tuple(0, Substs::empty())
     }
 
     pub fn fn_ptr(sig: FnSig) -> Self {
@@ -642,7 +642,7 @@ impl Ty {
 
     pub fn as_tuple(&self) -> Option<&Substs> {
         match self {
-            Ty::Tuple { substs: parameters, .. } => Some(parameters),
+            Ty::Tuple(_, substs) => Some(substs),
             _ => None,
         }
     }
@@ -684,9 +684,7 @@ impl Ty {
                 Ty::FnPtr { num_args, is_varargs, .. },
                 Ty::FnPtr { num_args: num_args2, is_varargs: is_varargs2, .. },
             ) => num_args == num_args2 && is_varargs == is_varargs2,
-            (Ty::Tuple { cardinality, .. }, Ty::Tuple { cardinality: cardinality2, .. }) => {
-                cardinality == cardinality2
-            }
+            (Ty::Tuple(cardinality, _), Ty::Tuple(cardinality2, _)) => cardinality == cardinality2,
             (Ty::Str, Ty::Str) | (Ty::Never, Ty::Never) => true,
             (Ty::Scalar(scalar), Ty::Scalar(scalar2)) => scalar == scalar2,
             _ => false,
@@ -754,10 +752,9 @@ impl Ty {
             | Ty::Ref(_, substs)
             | Ty::FnDef(_, substs)
             | Ty::FnPtr { substs, .. }
-            | Ty::Tuple { substs, .. }
+            | Ty::Tuple(_, substs)
             | Ty::OpaqueType(_, substs)
             | Ty::AssociatedType(_, substs)
-            | Ty::ForeignType(_, substs)
             | Ty::Closure { substs, .. } => {
                 assert_eq!(substs.len(), new_substs.len());
                 *substs = new_substs;
@@ -778,10 +775,9 @@ impl Ty {
             | Ty::Ref(_, substs)
             | Ty::FnDef(_, substs)
             | Ty::FnPtr { substs, .. }
-            | Ty::Tuple { substs, .. }
+            | Ty::Tuple(_, substs)
             | Ty::OpaqueType(_, substs)
             | Ty::AssociatedType(_, substs)
-            | Ty::ForeignType(_, substs)
             | Ty::Closure { substs, .. } => Some(substs),
             _ => None,
         }
@@ -796,10 +792,9 @@ impl Ty {
             | Ty::Ref(_, substs)
             | Ty::FnDef(_, substs)
             | Ty::FnPtr { substs, .. }
-            | Ty::Tuple { substs, .. }
+            | Ty::Tuple(_, substs)
             | Ty::OpaqueType(_, substs)
             | Ty::AssociatedType(_, substs)
-            | Ty::ForeignType(_, substs)
             | Ty::Closure { substs, .. } => Some(substs),
             _ => None,
         }
diff --git a/crates/hir_ty/src/lower.rs b/crates/hir_ty/src/lower.rs
index 6b919a09e..84734bc0b 100644
--- a/crates/hir_ty/src/lower.rs
+++ b/crates/hir_ty/src/lower.rs
@@ -148,7 +148,7 @@ impl Ty {
             TypeRef::Never => Ty::Never,
             TypeRef::Tuple(inner) => {
                 let inner_tys: Arc<[Ty]> = inner.iter().map(|tr| Ty::from_hir(ctx, tr)).collect();
-                Ty::Tuple { cardinality: inner_tys.len() as u16, substs: Substs(inner_tys) }
+                Ty::Tuple(inner_tys.len(), Substs(inner_tys))
             }
             TypeRef::Path(path) => {
                 let (ty, res_) = Ty::from_hir_path(ctx, path);
@@ -1100,10 +1100,10 @@ fn type_for_type_alias(db: &dyn HirDatabase, t: TypeAliasId) -> Binders<Ty> {
     let resolver = t.resolver(db.upcast());
     let ctx =
         TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
-    let substs = Substs::bound_vars(&generics, DebruijnIndex::INNERMOST);
     if db.type_alias_data(t).is_extern {
-        Binders::new(substs.len(), Ty::ForeignType(t, substs))
+        Binders::new(0, Ty::ForeignType(t))
     } else {
+        let substs = Substs::bound_vars(&generics, DebruijnIndex::INNERMOST);
         let type_ref = &db.type_alias_data(t).type_ref;
         let inner = Ty::from_hir(&ctx, type_ref.as_ref().unwrap_or(&TypeRef::Error));
         Binders::new(substs.len(), inner)
diff --git a/crates/hir_ty/src/method_resolution.rs b/crates/hir_ty/src/method_resolution.rs
index 087b67935..ff8ce5599 100644
--- a/crates/hir_ty/src/method_resolution.rs
+++ b/crates/hir_ty/src/method_resolution.rs
@@ -33,7 +33,7 @@ pub enum TyFingerprint {
     Scalar(Scalar),
     Adt(AdtId),
     Dyn(TraitId),
-    Tuple { cardinality: u16 },
+    Tuple(usize),
     ForeignType(TypeAliasId),
     FnPtr { num_args: u16, is_varargs: bool },
 }
@@ -50,7 +50,7 @@ impl TyFingerprint {
             &Ty::Array(..) => TyFingerprint::Array,
             &Ty::Scalar(scalar) => TyFingerprint::Scalar(scalar),
             &Ty::Adt(adt, _) => TyFingerprint::Adt(adt),
-            &Ty::Tuple { cardinality: u16, .. } => TyFingerprint::Tuple { cardinality: u16 },
+            &Ty::Tuple(cardinality, _) => TyFingerprint::Tuple(cardinality),
             &Ty::RawPtr(mutability, ..) => TyFingerprint::RawPtr(mutability),
             &Ty::ForeignType(alias_id, ..) => TyFingerprint::ForeignType(alias_id),
             &Ty::FnPtr { num_args, is_varargs, .. } => {
@@ -235,7 +235,7 @@ impl Ty {
             Ty::Adt(def_id, _) => {
                 return mod_to_crate_ids(def_id.module(db.upcast()));
             }
-            Ty::ForeignType(type_alias_id, _) => {
+            Ty::ForeignType(type_alias_id) => {
                 return mod_to_crate_ids(type_alias_id.lookup(db.upcast()).module(db.upcast()));
             }
             Ty::Scalar(Scalar::Bool) => lang_item_crate!("bool"),
diff --git a/crates/hir_ty/src/traits/chalk/mapping.rs b/crates/hir_ty/src/traits/chalk/mapping.rs
index 297ddeabd..c17c19638 100644
--- a/crates/hir_ty/src/traits/chalk/mapping.rs
+++ b/crates/hir_ty/src/traits/chalk/mapping.rs
@@ -55,7 +55,7 @@ impl ToChalk for Ty {
                 chalk_ir::TyKind::OpaqueType(id, substitution).intern(&Interner)
             }
 
-            Ty::ForeignType(type_alias, _) => {
+            Ty::ForeignType(type_alias) => {
                 let foreign_type = TypeAliasAsForeignType(type_alias);
                 let foreign_type_id = foreign_type.to_chalk(db);
                 chalk_ir::TyKind::Foreign(foreign_type_id).intern(&Interner)
@@ -63,7 +63,7 @@ impl ToChalk for Ty {
 
             Ty::Scalar(scalar) => chalk_ir::TyKind::Scalar(scalar).intern(&Interner),
 
-            Ty::Tuple { cardinality, substs } => {
+            Ty::Tuple(cardinality, substs) => {
                 let substitution = substs.to_chalk(db);
                 chalk_ir::TyKind::Tuple(cardinality.into(), substitution).intern(&Interner)
             }
@@ -199,7 +199,7 @@ impl ToChalk for Ty {
 
             chalk_ir::TyKind::Scalar(scalar) => Ty::Scalar(scalar),
             chalk_ir::TyKind::Tuple(cardinality, subst) => {
-                Ty::Tuple { cardinality: cardinality as u16, substs: from_chalk(db, subst) }
+                Ty::Tuple(cardinality, from_chalk(db, subst))
             }
             chalk_ir::TyKind::Raw(mutability, ty) => {
                 Ty::RawPtr(from_chalk(db, mutability), Substs::single(from_chalk(db, ty)))
@@ -221,10 +221,9 @@ impl ToChalk for Ty {
                 Ty::Closure { def, expr, substs: from_chalk(db, subst) }
             }
 
-            chalk_ir::TyKind::Foreign(foreign_def_id) => Ty::ForeignType(
-                from_chalk::<TypeAliasAsForeignType, _>(db, foreign_def_id).0,
-                Substs::empty(),
-            ),
+            chalk_ir::TyKind::Foreign(foreign_def_id) => {
+                Ty::ForeignType(from_chalk::<TypeAliasAsForeignType, _>(db, foreign_def_id).0)
+            }
             chalk_ir::TyKind::Generator(_, _) => unimplemented!(), // FIXME
             chalk_ir::TyKind::GeneratorWitness(_, _) => unimplemented!(), // FIXME
         }