Rust: Comments for macro expansions

macro_rules! foo_macro {
    ($name:ident) => {
        pub struct $name;
    }
}

/// Doc comment for Foo struct.
foo_macro!(Foo);

/// Doc comment for Bar struct.
foo_macro!(Bar);

In this trivial code sample the user wants to create a struct via macro expansion and write a unique comment for every different macro invokation.
This means a unique comment for struct Foo and Bar which is currently not possible in the rust compiler when enabling:

#![warn(missing_docs)]

With the following warnings:

warning: missing documentation for a struct
  --> src/activation_fn.rs:9:3
   |
9  |        pub struct $name;
   |        ^^^^^^^^^^^^^^^^^
...
14 | foo_macro!(Foo);
   | ---------------- in this macro invocation
   |
note: lint level defined here
  --> src/lib.rs:1:9
   |
1  | #![warn(missing_docs)]
   |         ^^^^^^^^^^^^

warning: missing documentation for a struct
  --> src/activation_fn.rs:9:3
   |
9  |        pub struct $name;
   |        ^^^^^^^^^^^^^^^^^
...
17 | foo_macro!(Bar);
   | ---------------- in this macro invocation
   |
note: lint level defined here
  --> src/lib.rs:1:9
   |
1  | #![warn(missing_docs)]
   |         ^^^^^^^^^^^^

While this obviously does work:

macro_rules! foo_macro {
    /// Unified comment for any macro expansion which is bad!
    ($name:ident) => {
        pub struct $name;
    }
}

foo_macro!(Foo);
foo_macro!(Bar);