derive(PartialBorrow) doesn't work if a field contains a reference

[lolbinarycat]

code:

use borrow::PartialBorrow;
#[derive(PartialBorrow)]
struct Foo<'a> {
 r: &'a u8
}

errors:

error: expected identifier, found `&`
 --> src/lib.rs:1:90
  |
1 | use borrow::PartialBorrow; #[derive(PartialBorrow)] #[module(crate)] struct Foo<'a> { r: &'a u8 }
  |                                     -------------                                        ^ expected identifier
  |                                     |
  |                                     this macro call doesn't expand to a type
  |                                     in this macro invocation
  |
  = note: this error originates in the macro `$crate::Foo` which comes from the expansion of the macro `Foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0726]: implicit elided lifetime not allowed here
 --> src/lib.rs:1:77
  |
1 | use borrow::PartialBorrow; #[derive(PartialBorrow)] #[module(crate)] struct Foo<'a> { r: &'a u8 }
  |                                                                             ^^^ expected lifetime parameter
  |
help: indicate the anonymous lifetime
  |
1 | use borrow::PartialBorrow; #[derive(PartialBorrow)] #[module(crate)] struct Foo<'_><'a> { r: &'a u8 }
  |                                                                                ++++

error[E0261]: use of undeclared lifetime name `'a`
 --> src/lib.rs:1:91
  |
1 | use borrow::PartialBorrow; #[derive(PartialBorrow)] #[module(crate)] struct Foo<'a> { r: &'a u8 }
  |                                     -------------                                         ^^ undeclared lifetime
  |                                     |
  |                                     lifetime `'a` is missing in item created through this procedural macro
  |
  = note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html

error[E0261]: use of undeclared lifetime name `'a`
 --> src/lib.rs:1:91
  |
1 | use borrow::PartialBorrow; #[derive(PartialBorrow)] #[module(crate)] struct Foo<'a> { r: &'a u8 }
  |                                                                                           ^^ undeclared lifetime

error[E0261]: use of undeclared lifetime name `'a`
 --> src/lib.rs:1:91
  |
1 | use borrow::PartialBorrow; #[derive(PartialBorrow)] #[module(crate)] struct Foo<'a> { r: &'a u8 }
  |                                     -------------                                      -  ^^ undeclared lifetime
  |                                     |                                                  |
  |                                     |                                                  help: consider introducing lifetime `'a` here: `<'a>`
  |                                     lifetime `'a` is missing in item created through this procedural macro

error[E0277]: the trait bound `r: borrow::Acquire<()>` is not satisfied
 --> src/lib.rs:1:37
  |
1 | use borrow::PartialBorrow; #[derive(PartialBorrow)] #[module(crate)] struct Foo<'a> { r: &'a u8 }
  |                                     ^^^^^^^^^^^^^ the trait `borrow::Acquire<()>` is not implemented for `r`
  |
  = note: required for `Cons<r, Nil>` to implement `SplitFields<Cons<(), Nil>>`
  = note: required for `FooRef<r>` to implement `PartialBorrow<FooRef<()>>`
  = note: this error originates in the derive