update for `impl Trait`

[steveklabnik]

This issue tracks inclusion of information about impl Trait into the Book. This will happen in the 2018 edition.

Tracking issue: rust-lang/rust#34511

[palotasb]

I'm going through the book and I wanted to post an issue about this. Closures as output parameters says that

returning closure types are problematic because Rust currently only supports returning concrete (non-generic) types

I've been able to change the examples from Box<Fn*()> to returning impl Fn*() so I guess the information above is obsolete.

[steveklabnik]

Yes, we haven’t added impl Trait yet. Nice catch!

…

On Jun 17, 2018, at 8:35 AM, Palotás Boldizsár ***@***.***> wrote: I'm going through the book and I wanted to post an issue about this. Closures as output parameters says that returning closure types are problematic because Rust currently only supports returning concrete (non-generic) types I've been able to change the examples from Box<Fn*()> to returning impl Fn*() so I guess the information above is obsolete. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.