avoid the same problem with the fallible_just test sender

Author: ericniebler

test/stdexec/algos/adaptors/test_let_error.cpp

@@ -235,14 +235,12 @@ namespace {
   }
 
   struct int_err_transform {
-    using my_res_t = decltype(fallible_just{0});
-
-    auto operator()(std::exception_ptr ep) const -> my_res_t {
+    auto operator()(std::exception_ptr ep) const -> fallible_just<int> {
       std::rethrow_exception(ep);
-      return {};
+      return fallible_just{0};
     }
 
-    auto operator()(int x) const -> my_res_t {
+    auto operator()(int x) const -> fallible_just<int> {
       return fallible_just{x * 2 - 1};
     }
   };

test/test_common/senders.hpp

@@ -42,11 +42,14 @@ namespace {
 
   template <class... Values>
   struct fallible_just {
-    std::tuple<Values...> values_;
     using sender_concept = stdexec::sender_t;
     using completion_signatures =
       ex::completion_signatures<ex::set_value_t(Values...), ex::set_error_t(std::exception_ptr)>;
 
+    explicit fallible_just(Values... values)
+      : values_(std::move(values)...) {
+    }
+
     template <class Receiver>
     struct operation : immovable {
       std::tuple<Values...> values_;
@@ -68,6 +71,8 @@ namespace {
       -> operation<std::decay_t<Receiver>> {
       return {{}, std::move(self.values_), std::forward<Receiver>(rcvr)};
     }
+
+    std::tuple<Values...> values_;
   };
 
   template <class... Values>