Rustdoc does not list associated constants for types in the sidebar

[orlp]

Consider the following struct and trait:

pub trait Trait {
    /// Foo.
    fn foo() { }

    /// Bar.
    const BAR: usize = 0;
}

pub struct Struct { }

impl Struct {
    /// Foo.
    pub fn foo() { }

    /// Bar.
    pub const BAR: usize = 0;
}

The sidebar generated by rustdoc for the trait is informative, allowing you to quickly jump to the methods and associated constants:

Sadly, the associated constant is completely missing in the sidebar for the struct:

This is particularly painful for types with many members, such as f32. It is not immediately obvious which associated constants it has. In my opinion rustdoc should also generate an 'associated constants' section in the sidebar for types, not just for traits.