Tracking issue for RFC PR 385 - module system cleanup

[nrc]

• Remove the ordering requirement for mod, extern crate, and other items;
• allow extern crate in non-module blocks;
• allow pub extern crate.

[nrc]

These three are backwards compatible (so shouldn't block 1.0), however, the first in particular is a wart, so I think we'd be happy to see that fixed pre-1.0 at least.

[nrc]

RFC: https://github.com/rust-lang/rfcs/blob/master/text/0385-module-system-cleanup.md

[pnkfelix]

P-high, not 1.0 (though some would be happy to see a PR for this sooner).

[aturon]

@pnkfelix The message from the triage meeting says not 1.0, but the issue was put on the milestone anyway?

[aturon]

Nominating. From previous discussion it's not clear what milestone this belongs on, if any.

[pnkfelix]

Removing the ordering restriction would be nice for 1.0 (not 1.0-beta). The other two bullets are not necessary for 1.0.

1.0 milestone.