pub_restricted field warning spans include close-paren

[causal-agent]

Warnings on pub_restricted fields produce odd spans including the close-paren:

src/lib.rs

#![feature(pub_restricted)]
pub mod foo;

src/foo.rs

pub struct Foo {
    pub(super) bar: u8,
}

cargo build

warning: struct field is never used: `bar`, #[warn(dead_code)] on by default
 --> src/foo.rs:2:14
  |
2 |     pub(super) bar: u8,
  |              ^^^^^^^^^

rustc --version

rustc 1.12.0-nightly (b30eff7ba 2016-08-05)

[Aatch]

There's most like some code that is still assuming that privacy modifiers are a single token.