Toot

@matzipan yeah, proc-macros are strange and mysterious 😅

I had a similar problem once (though just because I didn't know about the syntax, not because it was broken on nightly) ...

referring to a type in the derive macro like T::do_something() is only valid if T is not generic.

This syntax works always: <T>::do_something() (expanding to, for example, <Option<U>>::do_something())

Your initial error message reminded me of this problem, though I'm not sure the cause is the same.

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