Applying the bug fixes in a dependency I'm using when a new version of it is published… [1]
Sarcasm apart, I wasn't talking about features. But cargo is a really well-designed package manager. I've been using Rust full-time for 2 years now and it had never annoyed even once.
[1] the sarcasm was referring to the Minimum Version Selection algorithm used by go's package manager, which is a really bad case of NIH from Go's teams who decided to throw away a thriving community work to do their own stuff, ending up with something different from what everybody else has been for more than 20 years. And unsurprisingly, it's really bad…