I find repl.it's go REPL to be totally unsatisfactory. I don't want to have to type `package main` at the top of my REPL before being able to evaluate any expression [0]. Avoiding that sort of boilerplate is a REPL's raison d'être.
In contrast, [gore](https://github.com/motemen/gore) lets you start evaluating expressions right away [1], and provides nice REPL short-hand for importing packages [2].