gcc 16 build error

[prlw1]

Trying to compile the following

#include <stdexec/execution.hpp>
#include <print>

int main() {
        std::println("hello stdexec");
}

with 71d22ca stdexec and gcc 16, I see

#   compile  commabug/commabug.o
/usr/local/gcc/bin/g++  -O2 -fPIE -g -Werror -std=c++26     -I/usr/src/local/stdexec/include  -c    commabug.cc
In file included from /usr/src/local/stdexec/include/stdexec/__detail/__bulk.hpp:28,
                 from /usr/src/local/stdexec/include/stdexec/execution.hpp:23,
                 from commabug.cc:1:
/usr/src/local/stdexec/include/stdexec/__detail/__senders.hpp:159:50: error: omission of ',' before varargs '...' is deprecated in C++26 [-Werror=deprecated-variadic-comma-omission]
  159 |       constexpr auto operator()(_Sender&&, _Env&&...) const noexcept
      |                                                  ^~~
      |                                                  , 
In file included from /usr/src/local/stdexec/include/stdexec/execution.hpp:39:
/usr/src/local/stdexec/include/stdexec/__detail/__let.hpp:616:52: error: omission of ',' before varargs '...' is deprecated in C++26 [-Werror=deprecated-variadic-comma-omission]
  616 |         []<class _Self, class _Env>(_Self&&, _Env&&...) noexcept {
      |                                                    ^~~
      |                                                    , 
cc1plus: all warnings being treated as errors
*** Error code 1

If I simply do as it says and apply

diff --git a/include/stdexec/__detail/__let.hpp b/include/stdexec/__detail/__let.hpp
index 9d40410f..fca43433 100644
--- a/include/stdexec/__detail/__let.hpp
+++ b/include/stdexec/__detail/__let.hpp
@@ -613,7 +613,7 @@ namespace stdexec {
         };
 
       static constexpr auto get_completion_signatures =
-        []<class _Self, class _Env>(_Self&&, _Env&&...) noexcept {
+        []<class _Self, class _Env>(_Self&&, _Env&&, ...) noexcept {
           static_assert(sender_expr_for<_Self, __let_tag<_SetTag>>);
           if constexpr (__decay_copyable<_Self>) {
             using __fn_t = __decay_t<__fun_of<_Self>>;
diff --git a/include/stdexec/__detail/__senders.hpp b/include/stdexec/__detail/__senders.hpp
index 87f1cf81..75ac6e6b 100644
--- a/include/stdexec/__detail/__senders.hpp
+++ b/include/stdexec/__detail/__senders.hpp
@@ -156,7 +156,7 @@ namespace stdexec {
         requires __callable<__mtypeof<_DeclFn>>
               || __with_legacy_tag_invoke<__tfx_sender<_Sender, _Env>, _Env>
       [[deprecated("the use of tag_invoke for get_completion_signatures is deprecated")]]
-      constexpr auto operator()(_Sender&&, _Env&&...) const noexcept
+      constexpr auto operator()(_Sender&&, _Env&&, ...) const noexcept
         -> tag_invoke_result_t<get_completion_signatures_t, __tfx_sender<_Sender, _Env>, _Env> {
         return {};
       }

then it compiles successfully.