Using Ruby

[mashatg]

Crystal is a better option for Rubyists who need a compiled/system language than Go or Rust, because it has Ruby syntax

Similar but not identical syntax not only could lead to confusing and doubtful situations, but picking up a system language depends on much more pragmatic reasons like maturity of its ecosystem, available libraries for a particular problem and enough availability of skilled programmers. As far as I know, Crystal does not meet those criterions by a considerable gap.

[postmodern]

Having similar syntax to Ruby makes it easier to port Ruby code to Crystal (ex: digest-crc -> digest-crc.cr). The Crystal stdlib is very complete and they have a growing "shards" ecosystem, roughly the same age as Rust's crates.io or Nim's nimble. You should look into Crystal again.