Which part of Go(lang) is in Crystal(lang)? Reading Crystal Programming Language They says it is inspired from many programming language and Go.

I would like too know which part of Golang, since it is not its syntax.
I simply asked @asterite, one of the developers of Crystal, at IRC #crystal-lang (the log is here).

He said the answer is CSP, the concurrency model. For example, both Go and Crystal use channels for communications.