For me personally, it's not what the language offers syntax-wise but what I can do with it. I was excited about Ruby because of Rails; only after working with

For me personally, it's not what the language offers syntax-wise but what I can do with it. I was excited about Ruby because of Rails; only after working with it did I pick up a book on Ruby itself and come to appreciate the cleverness of block arguments (Ruby's insight, that functions that accept another function as an argument almost always accept at most one, so special-casing the syntax for that to make it clear, was really quite clever). And then I migrated away from using Ruby when I started to care about execution speed and couldn't escape the feeling that I was investing more time keeping up with the framework changes than I was writing my program. For Go, I can write fast web servers in it. That's what I want, and it shines for that use case. I haven't looked at Haskell for that use case yet. Rust is still figuring itself out in that space (http://arewewebyet.com/ http://arewewebyet.com/). Go, in contrast, has a very solid commitment to backwards compatibility until the major version number changes. So my general take on Rust and Haskell, specifically, is "Wake me when it's cooked."