Cannot derive WrappedVec if I need lifetime specifiers

[mildsenseofdoom]

I.e. this doesn't work, which I'd like to be able to use:

#[derive(wrapped_vec::WrappedVec)]
#[CollectionName = "Collection"]
struct Struct<'a> {
    var: &'a str,
}

This gives the following error:

error[E0106]: missing lifetime specifier
  --> src/lib.rs:15:8
   |
15 | struct Struct<'a> {
   |        ^^^^^^ expected named lifetime parameter
   |
help: consider introducing a named lifetime parameter
   |
13 ~ #[derive(wrapped_vec::WrappedVec<'a>)]
14 | #[CollectionName = "Collection"]
15 ~ struct Struct<'a><'a> {
   |

The suggestion does not work, and the intuitive-to-me idea of adding the specifier in the CollectionName does not work because WrappedVec doesn't seem to recognise the lifetime specifier as valid:

#[derive(wrapped_vec::WrappedVec)]
#[CollectionName = "Collection<'a>"]
struct Struct<'a> {
    var: &'a str,
}

Gives:

error: proc-macro derive panicked
  --> src/lib.rs:13:10
   |
13 | #[derive(wrapped_vec::WrappedVec)]
   |          ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: message: `"Collection<'a>"` is not a valid identifier

I tried looking in the documentation for how to do this but it wasn't marked, so if I missed it then maybe a reference in the error message would help people in future.