documentation: str::split_at_mut() example wrong

[bungcip]

it seem example in https://doc.rust-lang.org/std/primitive.str.html#method.split_at_mut
is duplicate of str::split_at() example

[GuillaumeGomez]

Indeed. Want to fix it?

[bungcip]

Sure, but I will need to clone & learn how to build rust from source tough. I hope my notebook is not too slow to compile it :).

[bluss]

Go ahead and fix. But for this small thing I would probably not build rust locally at all. Make sure the code compiles in a simpler environment, and then let the test builders take care of it?

[GuillaumeGomez]

Just like @bluss said, no need to build anything. Just modify the comment in the rustc source code and open a PR.

[tbu-]

Fixed by #32941.