Group use vs mod statements

[dakom]

Consider the following:

use std::borrow::Cow;
use std::alloc::GlobalAlloc;
pub mod baz;
use std::cell::Cell;
use std::ascii::AsciiExt;

When running rustfmt, this sorts the use statements alphabetically, but leaves the mod in place:

use std::alloc::GlobalAlloc;
use std::borrow::Cow;
pub mod baz;
use std::ascii::AsciiExt;
use std::cell::Cell;

1. Is there an established convention for whether all mod statements should go above or below all use?
2. If so, is there a way to enforce that in rustfmt?

[topecongiro]

Is there an established convention for whether all mod statements should go above or below all use?

Not that I know of, though most of the code I have read have put mod statements above use statements.

If so, is there a way to enforce that in rustfmt?

Unfortunately no.

[dakom]

Hmm, so maybe it should be established and put in rustfmt as the default?