LWG4209 default_domain::transform_env should be returning FWD-ENV(env)

Author: burblebee

source/exec.tex

@@ -2247,7 +2247,7 @@
 tag_of_t<Sndr>().transform_env(std::forward<Sndr>(sndr), std::forward<Env>(env))
 \end{codeblock}
 if that expression is well-formed;
-otherwise, \tcode{static_cast<Env>(std::forward<Env>(env))}.
+otherwise, \tcode{\exposid{FWD-ENV}(std::forward<Env>(env))}.
 
 \pnum
 \mandates