How do you handle creating fn pointers to associated functions that are implemented requiring some with clauses? For example what if you did let deserialize_fn: fn(&mut Deserializer) -> Result<T, Error> = T::deserialize;. How is the compiler supposed to pass the context to that function? This is quite similar to a problem I found in another recent proposal of with clauses `with` clauses - #8 by SkiFire13
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