rfc, self_in_typedefs: update Unresolved questions.

Author: Centril

text/0000-self-in-typedefs.md

@@ -603,37 +603,4 @@ is preferred.
 # Unresolved questions
 [unresolved]: #unresolved-questions
 
-## Should the migration advice be to use `Self` instead of the concrete type?
-
-In the [migration advice] we suggest that `clippy` should encourage users to
-move towards using `Self` instead of the concrete type. This RFC currently
-argues that this should be best practice.
-
-However, there is some concern that the reading code that pervasively uses
-`Self` across the board adds a level of indirection since readers are often
-interested in the concrete type instead of just knowing that it is the `Self`
-type. To mitigate this indirection, it is possible to improve `rustdoc` such
-that you can hover `Self` and its associated types (if there are any) to see
-what the concrete type is. Hovering can reduce the degree to which you have
-to jump to see what the concrete type is.
-
-Furthermore, the level of indirection introduced by using `Self` is not much.
-Only one level of indirection is introduced.
-
-With respect to type definitions specifically, there usually are few enough
-variants that you can keep the header `enum Foo {` in visual scope in your editor.
-Therefore, you can quickly see what the concrete type is.
-
-When you are dealing with complex types, `Self` can also be easier to read
-as you can syntax-highlight for it easily and provide a distinct color for it.
-
-Using `Self` or an associated type of `Self` such as in `-> Option<Self::Item>`
-also provides information about the context we are dealing with in the case of
-traits. Writing out the concrete type can therefore make patterns harder to see.
-
-However, the standard library currently writes out the associated type. This
-can be seen in the case of `Iterator`, where instead of writing
-`fn next(&mut self) -> Option<Self::Item>` the standard library will use
-`fn next(&mut self) -> Option<SomeConcreteType>`.
-
-There are no other unresolved questions.
+There are no unresolved questions.