When auto-importing the trait for .deref(), RA chooses lazy_static::__Deref over std::ops::Deref

[rben01]

Description: when RA suggests .deref() and picks a trait to auto-import to bring deref() into scope, it chooses lazy_static::__Deref instead of the more common std::ops::Deref or core::ops::Deref. My Cargo.toml contains lazy_static = "1.4.0" under [dependencies].

VSCode screenshot:

Code to reproduce is below. The issue also occurs if rc::Rc is replaced with cell::RefCell (and .borrow() added to obtain a Ref), but I'm not sure about what happens with other Deref implementors.

use std::rc::Rc;

struct A {
	r: Rc<String>,
}

fn f() {
	let a = A {
		r: Rc::new("s".to_owned()),
	};
	let s = a.r.der|      // Cursor to the right of `der`
	//             ┌──────────────────────────────────────────┐
	//             │³ deref() (use lazy_static::__Deref)      │
	//             │³ deref_mut() (use std::ops::DerefMut)    │
	//             └──────────────────────────────────────────┘
}

RA correctly suggests .deref() as an autocomplete for der, but chooses to auto-import the necessary trait from lazy_static::__Deref, instead of std::ops::Deref or core::ops::Deref, which seem like more reasonable choices. (It correctly offers to import .deref_mut() from std::ops::DerefMut.) In the attached screenshot, pressing <TAB> will insert use lazy_static::__Deref near the top of the file.

Similarly, if you write out deref() without importing anything, the fix-it for the error offers to import or qualify with lazy_static::_Deref (same underlying issue, I assume).

[Veykril]

Duplicate of #9197