We can also offer more precise choices: say you have an ambiguous `Deref`, instead of saying `T` in the turbofish (for brevity), we could let the user select fr

We can also offer more precise choices: say you have an ambiguous `Deref`, instead of saying `T` in the turbofish (for brevity), we could let the user select from the different available `Deref` impls what should be inserted.