Use lifetimebound in Choice API

Author: danakj

subspace/choice/choice.h

@@ -352,7 +352,7 @@ class Choice<__private::TypeList<Ts...>, Tags...> final {
   /// passed as the template parameter.
   template <TagsType V>
     requires(__private::ValueIsNotVoid<StorageTypeOfTag<V>>)
-  constexpr inline decltype(auto) as() const& noexcept {
+  constexpr inline decltype(auto) as() const& noexcept sus_lifetimebound {
     ::sus::check(index_ == index<V>);
     return __private::find_choice_storage<index<V>>(storage_).as();
   }
@@ -376,7 +376,7 @@ class Choice<__private::TypeList<Ts...>, Tags...> final {
   /// passed as the template parameter.
   template <TagsType V>
     requires(__private::ValueIsNotVoid<StorageTypeOfTag<V>>)
-  constexpr inline decltype(auto) as_mut() & noexcept {
+  constexpr inline decltype(auto) as_mut() & noexcept sus_lifetimebound {
     ::sus::check(index_ == index<V>);
     return __private::find_choice_storage_mut<index<V>>(storage_).as_mut();
   }
@@ -411,7 +411,8 @@ class Choice<__private::TypeList<Ts...>, Tags...> final {
   /// active member.
   template <TagsType V>
     requires(__private::ValueIsNotVoid<StorageTypeOfTag<V>>)
-  constexpr inline Option<AccessTypeOfTagConst<V>> get() const& noexcept {
+  constexpr inline Option<AccessTypeOfTagConst<V>> get() const& noexcept
+      sus_lifetimebound {
     if (index_ != index<V>) return ::sus::none();
     return ::sus::some(__private::find_choice_storage<index<V>>(storage_).as());
   }
@@ -431,7 +432,8 @@ class Choice<__private::TypeList<Ts...>, Tags...> final {
   /// active member.
   template <TagsType V>
     requires(__private::ValueIsNotVoid<StorageTypeOfTag<V>>)
-  constexpr inline Option<AccessTypeOfTagMut<V>> get_mut() & noexcept {
+  constexpr inline Option<AccessTypeOfTagMut<V>> get_mut() & noexcept
+      sus_lifetimebound {
     if (index_ != index<V>) return ::sus::none();
     return ::sus::some(
         __private::find_choice_storage_mut<index<V>>(storage_).as_mut());
@@ -467,7 +469,7 @@ class Choice<__private::TypeList<Ts...>, Tags...> final {
   template <TagsType V>
     requires(__private::ValueIsNotVoid<StorageTypeOfTag<V>>)
   constexpr inline decltype(auto) get_unchecked(
-      ::sus::marker::UnsafeFnMarker) const& noexcept {
+      ::sus::marker::UnsafeFnMarker) const& noexcept sus_lifetimebound {
     return __private::find_choice_storage<index<V>>(storage_).as();
   }
   // If the storage is a value type, it can't be accessed by reference in an
@@ -492,7 +494,7 @@ class Choice<__private::TypeList<Ts...>, Tags...> final {
   template <TagsType V>
     requires(__private::ValueIsNotVoid<StorageTypeOfTag<V>>)
   constexpr inline decltype(auto) get_unchecked_mut(
-      ::sus::marker::UnsafeFnMarker) & noexcept {
+      ::sus::marker::UnsafeFnMarker) & noexcept sus_lifetimebound {
     return __private::find_choice_storage_mut<index<V>>(storage_).as_mut();
   }