Structs with bounds on generics trigger lints

[Rosdf]

trait MyTrait {}

#[derive_where(Debug; T: Debug)]
struct MyStruct<T: MyTrait> {
    t: T,
}

this code causes lint trigger

warning: type `T` has already been used as a bound predicate
   |
79 |     #[derive_where(Debug; T: Debug)]
   |                           ^^^^^^^^
   |
   = help: consider combining the bounds: `T: MyTrait + Debug`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_repetition_in_bounds

[daxpedda]

I think this is rather a false-positive from Clippy, because these kind of lints shouldn't trigger from proc-macros.
It could also be that we are using the wrong spans, needs looking into.