Yeah, I remember wanting to do a fan-out pattern in Go and reading the Go Pipelines and Cancellation article[0]. I saw the function merge() in the article and thought, "Great, here's what I need!" I then proceeded to read further and saw that I have to define this function myself based on the types I'm using, which made me quite sad.

Go really needs a library for these patterns built in... I assume the lack of generics prevents users from creating that themselves (I'm not trying to start a language war here, seriously).

[0] http://blog.golang.org/pipelines