two runs required on imports with leading ::

[calebcartwright]

Formatting can take two runs when imports are using absolute paths and include leading :: (when using the 2018 edition config option)

Original source:

use ::foo;
use ::foo::{Bar};
use ::foo::{Bar, Baz};
use ::{Foo};
use ::{Bar, Baz};

1st formatting result:

use ::foo;
use ::foo::Bar;
use ::foo::{Bar, Baz};
use ::Foo;
use ::{Bar, Baz};

And then second formatting run to get the final result:

use ::Foo;
use ::foo;
use ::foo::Bar;
use ::foo::{Bar, Baz};
use ::{Bar, Baz};

Seems to be related to the first run reducing ::{Foo} to ::Foo but without fully sorting/reordering the set of imports, and then the second run sorting them to finish formatting.

[ytmimi]

Confirming this is still an issue using rustfmt 1.5.1-nightly (f2c31ba0 2022-07-19)

[ytmimi]

I believe this is also an issue with --edition=2021

[davidBar-On]

I tried with the latest nightly master and it seems that the issue does not exist - no need for two runs.

However, the output is:

use foo;
use foo::Bar;
use foo::{Bar, Baz};
use Foo;
use {Bar, Baz};

The :: is removed from all lines and I don't know whether this is o.k.