Import/qualify trait Deref suggesting lazy_static::__Deref instead of std::ops::Deref

[ThePuzzlemaker]

The code action to import/qualify a trait suggests lazy_static::__Deref instead of std::ops::Deref for just the name Deref.

To reproduce:

• Add lazy_static v1.4.0 to the Cargo.toml (Not sure if this happens on other versions)
• Create an impl block impl Deref for Foo.
• Press alt-period or whatever code action shortcut is set up while the cursor is over the Deref in the impl Deref for Foo block.
• lazy_static::__Deref is suggested instead of std::ops::Deref.

Information:
IDE: VSCode
Plugin: matklad.rust-analyzer v0.2.621
rust-analyzer version: rust-analyzer 28e32fe 2021-05-31 stable
Rust: 1.52.1

[lnicola]

CC #9113

[Veykril]

The problem here is that lazy_static reexports Deref with a doc hidden. We should ideally honor the #[doc(hidden)] attribute unless its hidden in the same crate we are importing from.
Minimal test case for autoimport that imports __Deref:

//- /main.rs crate:main deps:std,lazy_static
impl Deref$0 for () {}
//- /lazy_static.rs crate:lazy_static deps:core
#[doc(hidden)]
pub use core::ops::Deref as __Deref;
//- /std.rs crate:std deps:core
pub use core::ops;
//- /core.rs crate:core
pub mod ops {
    pub trait Deref {}
}

Though I don't think we can do anything here at the moment as re-exports/renames aren't really being represented in the hir yet so we lose the attribute info here i think?