rustdoc reports error twice for ambiguous (inherent) associated type

[camelid]

#![feature(inherent_associated_types)]
#![allow(incomplete_features)]

pub struct Struct;

impl Struct {
    pub type AssocTy = usize;
    pub const AssocConst: Self::AssocTy = 42;
}

rustc only emits the error once, but rustdoc emits it twice. rustdoc output:

error[E0223]: ambiguous associated type
  --> $DIR/ambiguous-inherent-assoc-ty.rs:11:27
   |
LL |     pub const AssocConst: Self::AssocTy = 42;
   |                           ^^^^^^^^^^^^^ help: use fully-qualified syntax: `<Struct as Trait>::AssocTy`

error[E0223]: ambiguous associated type
  --> $DIR/ambiguous-inherent-assoc-ty.rs:11:27
   |
LL |     pub const AssocConst: Self::AssocTy = 42;
   |                           ^^^^^^^^^^^^^ help: use fully-qualified syntax: `<Struct as Trait>::AssocTy`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0223`.

cc #88573