`extern crate foo as bar;` gives outdated & unhelpful error message

[huonw]

extern crate foo as bar;

Fails to compile with:

<anon>:1:18: 1:20 error: expected one of `=`, `;`, found `as`
<anon>:1 extern crate foo as bar;
                          ^~

The problem is the foo currently needs to be a string: extern crate "foo" as bar. The error message is referring to = still (the old syntax), and it could easily be improved to say "maybe you meant to enclose foo in a string".

[gamazeps]

Done ;)