Regression because of #26008

[tomaka]

#26008 caused a regression (see travis).

Here is the code:

use std::rc::Rc;

let a: Rc<Option<u32>> = Rc::new(Some(5));
let _b: Option<&u32> = a.as_ref();

It works with stable because as_ref() is called on the Option.
But in the nightlies, as_ref() is called on the Rc and I get a &Option<u32> instead of a Option<&u32>.

[Aatch]

Related to #26080

[arielb1]

@Aatch

Not really. This case works in the same way as a.clone() (working on the Rc rather than dereferencing it).

[retep998]

According to the semver RFC this is semver compatible because it is possible to rewrite the code in a way that will work with both versions: Option::as_ref(&*a)

[alexcrichton]

triage: P-high

decided to revert the addition of the AsRef impl, and try again later perhaps but first run it through crater.