default impl not showing up in rustdoc

[jethrogb]

For example, we have ToString:

impl<T: fmt::Display + ?Sized> ToString for T {
    fn to_string(&self) -> String { /*...*/ }
}

This shows up fine in stable: https://doc.rust-lang.org/stable/std/string/trait.ToString.html

However, starting in beta, we have a specializable version:

impl<T: fmt::Display + ?Sized> ToString for T {
    default fn to_string(&self) -> String { /*...*/ }
}

Which doesn't show up: https://doc.rust-lang.org/beta/std/string/trait.ToString.html

[apasel422]

Is this related to #32841 and #29503?

[jethrogb]

Definitely a dupe of #32841, which I didn't find because it was unlabeled. Not sure if either of these is actually a dupe of #29503, since I suspect this is related to specialization.

[jethrogb]

Not due to specialization, actually a regression, see e.g. https://doc.rust-lang.org/stable/std/any/trait.Any.html vs https://doc.rust-lang.org/nightly/std/any/trait.Any.html which does not use specialization.