The Rust vs Nim comparison is tainted by very out of date documentation hosted on some MIT servers (the condition system is entirely gone). It's unfortunate and we have contacted the web master but there's not much they can do to remove or change how it appears in search engine rankings.
For reference, doc.rust-lang.org is the only place to look for documentation for the standard libraries; any other hosting of those docs is likely to be out-of-date.
The "I missed Nim" article to which it links to includes
> Nim has Exceptions with tracking (!) and Rust has… something incomprehensible or perhaps its this, I am actually not sure ;). Again, for me, a clear win for Nim.
where "something incomprehensible" links to very old documentation of the conditions system, which was removed quite a while ago.
For reference, doc.rust-lang.org is the only place to look for documentation for the standard libraries; any other hosting of those docs is likely to be out-of-date.