Use Rust 2018 syntax?

[thejpster]

Should we be using Rust 2018 syntax in the book? The main change would be removing extern crate statements.

[hyperslv]

agree but the suggested change has to be synchronized with the appropriate change in source code of the examples at github.com/rust-embedded/cortex-m-quickstart .
I will help & fix both if someone explains me how to synchronize these Repos

[therealprof]

What do you mean by synchronize? Open PRs on both and then we'll merge them, couldn't be easier. 😅

[hyperslv]

Created a PR on this issue

[hyperslv]

This issue might be closed since the appropriate PR was merged.

[Narukara]

There are still some extern crate statements in the book. For example:

book/src/peripherals/singletons.md

Line 65 in 19f798d

extern crate cortex_m;

book/src/collections/index.md

Line 33 in 09986cd

extern crate alloc;

Shall we fix them all?

[eldruin]

@Narukara I would welcome a PR fixing them all. We could then close this issue.