[calcifer]

> I'd like my IDE to tell me when I accidentally stopped implementing an interface

I don't know about others, but Goland's analyser is pretty powerful and can navigate from interface to implementation(s) and vice versa.

[BadBadJellyBean]

In my experience only when you implement it correctly. If I add a new method to the interface I can't navigate to the implementations anymore because they don't completely implement the interface.

[calcifer]

That's surely the correct behaviour?

[BadBadJellyBean]

It is. But it's also an inconvenience. In a language like Java I can just say that a class implements an interface. If the interface changes the compiler and the IDE tell me about the missing methods. Go not so much.