Rust Plugin shows error which is compiled by rustc

[rfaeseke]

Environment

• IntelliJ Rust plugin version:
  0.4.166.4426-213-nightly
• Rust toolchain version:
  nightly-x86_64-apple-darwin (override)
• IDE name and version:
  IntelliJ IDEA 2021.3.1 (Ultimate Edition)
  Build #IU-213.6461.79, built on December 28, 2021
• Operating system:
  macOS Big Sur

Problem description

When opening rxRust https://github.com/rxRust/rxRust project then in file

subject.rs the code
...
fn emit_buffer<'a, O, B, Item, Err, T>(mut observer: O, b: &'a B)
where
O: DerefMut,
O::Target: Observer<Item = Item, Err = Err>,
B: RcDerefMut<Target<'a> = T> + 'a,
T: DerefMut<Target = Vec<ObserverTrigger<Item, Err>>>,
{
...
is marked with error "Function emit_buffer must have a body", but cargo build compiles the project without errors.
The problem seems to be caused by the line B: RcDerefMut<Target<'a> = T> + 'a, which uses the trait
....
pub trait RcDerefMut {
type Target<'a>
where
Self: 'a;
#[allow(clippy::needless_lifetimes)]
fn rc_deref_mut<'a>(&'a self) -> Self::Target<'a>;
}
...