<!-- Thank you for filing a bug report! 🐛 Please provide a short summary of the bug, along with any information you feel relevant to replicating the bug. --> I was looking into https://doc.rust-lang.org/std/iter/trait.Iterator.html trying to find source code for the [`zip` method](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.zip) I expected to see "src" with a link to the function source code. Instead, there appear to be no such link and other methods (even [`next`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.next)!) of this trait also lack source code links.