From ce19cb2feb8c95550c90ec42004bf14f24fb7c04 Mon Sep 17 00:00:00 2001
From: Ian Petersen <ispeters@gmail.com>
Date: Fri, 2 Oct 2026 17:04:51 -0700
Subject: [PATCH] Address -Wdeprecated-declarations

When building with Clang 23+, `test_any_sender.cpp` fails to compile
because one of the test cases instatiates a deprecated class template
(`exec::any_receiver_ref`) inside `std::is_constructible_v`. For some
reason, the file-wide `-Wno-deprecated-declarations` pragma doesn't
suppress the warning, perhaps because the instantiation of the
deprecated class template happens inside the standard library.

The error looks like this:
```
error:
'any_receiver_ref<std::execution::completion_signatures<std::execution::set_value_t ()>>'
is deprecated: use exec::any_receiver<Sigs, ReceiverQueries> instead
[-Werror,-Wdeprecated-declarations]
   27 | ... inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...);
      |                                                ^
```

This diff suppresses the warning by forcing the first class template
instantiation to be inside the blanket suppression (with an
otherwise-useless `static_assert(sizeof(type) != 0)`) so that the
subsequent use of `std::is_constructible_v` doesn't re-trigger the
warning.
---
 test/exec/test_any_sender.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/test/exec/test_any_sender.cpp b/test/exec/test_any_sender.cpp
index 74b82e058..2bf61ad42 100644
--- a/test/exec/test_any_sender.cpp
+++ b/test/exec/test_any_sender.cpp
@@ -100,9 +100,12 @@ namespace
     STATIC_REQUIRE(std::is_copy_assignable_v<exec::any_receiver_ref<Sigs>>);
     STATIC_REQUIRE(std::is_constructible_v<exec::any_receiver_ref<Sigs>, sink_receiver const &>);
     STATIC_REQUIRE(!std::is_constructible_v<exec::any_receiver_ref<Sigs>, sink_receiver &&>);
-    STATIC_REQUIRE(
-      !std::is_constructible_v<exec::any_receiver_ref<ex::completion_signatures<ex::set_value_t()>>,
-                               sink_receiver const &>);
+    using void_ref = exec::any_receiver_ref<ex::completion_signatures<ex::set_value_t()>>;
+    // void_ref names a deprecated partial specialization. Complete it here, inside this
+    // file's -Wdeprecated-declarations suppression; otherwise it is first completed inside
+    // libc++'s is_constructible_v, where the suppression doesn't apply.
+    static_assert(sizeof(void_ref) != 0);
+    STATIC_REQUIRE(!std::is_constructible_v<void_ref, sink_receiver const &>);
   }
 
   TEST_CASE("exec::any_receiver_ref is queryable", "[types][any_sender]")