If Ralf didn't know it, I guess it deserves a name. This is the first I got,
feel free to improve.

That's the documentation I'd have wanted to see, and viceversa the lack of this
rule implied (to me) that this wouldn't work.

Thanks to Siddharth for pointing this out

move the dynamic composeable higher-order ghost state logic up so it does not seem to depend on  a language

This reverts commit 7a6d36c6.