"Could not find <module> in <module>" uses wrong span when {...} are involved

[RalfJung]

The following program: (Playpen)

use std::bar::{foo1, foo2};

fn main() {
    println!("Hello, world!");
}

Produces these errors:

error[E0432]: unresolved import `std::bar::foo1`
 --> <anon>:1:16
  |
1 | use std::bar::{foo1, foo2};
  |                ^^^^ Could not find `bar` in `std`

error[E0432]: unresolved import `std::bar::foo2`
 --> <anon>:1:22
  |
1 | use std::bar::{foo1, foo2};
  |                      ^^^^ Could not find `bar` in `std`

Notice how the ^ put the blame on the part inside the curly brace, where really, they should point at the bar (or at the entire std::..., which is what happens when no curly braces are involved).

[PlasmaPower]

Ideally it'd be reduced to one error, like this:

error[E0432]: unresolved import `std::bar`
 --> <anon>:1:10
  |
1 | use std::bar::{foo1, foo2};
  |          ^^^ Could not find `bar` in `std`