redundant_clone: false positive using ToOwned

The following code :

pub fn own<T, U>(v: T) -> U
where
    T: ToOwned<Owned = U>,
{
    v.to_owned()
}

generates the following lint:

warning: redundant clone
 --> src/main.rs:5:6
  |
5 |     v.to_owned()
  |      ^^^^^^^^^^^ help: remove this
  |
  = note: `#[warn(clippy::redundant_clone)]` on by default
note: this value is dropped without further use
 --> src/main.rs:5:5
  |
5 |     v.to_owned()
  |     ^
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_clone

However, removing the .to_owned leads to a compilation error since the return types are different.

May be related to #5700

Meta

• cargo clippy -V: clippy 0.1.52 (e9920ef 2021-02-11)
• rustc -Vv:

  rustc 1.52.0-nightly (e9920ef77 2021-02-11)
  binary: rustc
  commit-hash: e9920ef7749d11fc71cc32ca4ba055bcfeaab945
  commit-date: 2021-02-11
  host: x86_64-unknown-linux-gnu
  release: 1.52.0-nightly
  LLVM version: 11.0.1
  

Reproduce the report from the src/main.rs example with cargo clippy, focusing on the redundant_clone lint and the ToOwned<Owned = U> bound. Done means the valid v.to_owned() call is not reported as a redundant clone, while the example continues to compile.