```
➜  AdoptJRuby git:(fiber_enumerator_next) ✗ docker run -it jruby_fiber_enumerator_next ruby -v     
Picked up JAVA_TOOL_OPTIONS: 
jruby 9.2.7.0-SNAPSHOT (2.5.3) 2019-04-03 dc503f1 OpenJDK 64-Bit Server VM 11.0.2+9 on 11.0.2+9 +jit [linux-x86_64]
```