Duplicate entries in list of Implementors in standard library docs

[mulkieran]

Go to: https://doc.rust-lang.org/std/ops/trait.Deref.html. Search in your browser for impl Deref for String. Get two matches. Same for impl<T> Deref for Vec<T>.

Also, look for Box, Arc, and Rc. These each get three entries. Two are identical as strings, but the third is identical in meaning, AFAICT.

[mulkieran]

Also, it is quite unclear to me what order the implementors are displayed in...I suspect it is some kind of random artifact of the implementation.

[steveklabnik]

Can you file this bug against https://github.com/rust-lang/rust/ please? This is a bug in the doc generation tool, not in the website. Thank you!

[mulkieran]

Old issue: rust-lang/rust#25061.