LWG4369 check-types function for upon_error and upon_stopped is wrong

Author: burblebee

source/exec.tex

@@ -3816,7 +3816,7 @@
 Equivalent to:
 \begin{codeblock}
 auto cs = get_completion_signatures<@\exposid{child-type}@<Sndr>, @\exposid{FWD-ENV-T}@(Env)...>();
-auto fn = []<class... Ts>(set_value_t(*)(Ts...)) {
+auto fn = []<class... Ts>(@\exposid{decayed-typeof}@<@\exposid{set-cpo}@>(*)(Ts...)) {
   if constexpr (!@\libconcept{invocable}@<remove_cvref_t<@\exposid{data-type}@<Sndr>>, Ts...>)
     throw @\placeholder{unspecified-exception}@();
 };