Ignoring crates with specific terms

[WaDelma]

I wanted to search for crates that provide asynchronous IO so I was looking at the Asynchronous category. The top results there are all tokio crates (expect raw mio). Ans because I wanted to see other options I have I tried to add search term -tokio to see them, which doesn't work

So I would like to have way to filter out crates with specific search terms.

[erlend-sh]

http://arewegameyet.com/ also needs this feature to better create targeted lists for the Rust gamedev ecosystem.