Environment

jruby 9.2.1.0 (2.5.0) 2018-11-06 7b14404 Java HotSpot(TM) 64-Bit Server VM 25.191-b12 on 1.8.0_191-b12 +jit [mswin32-x86_64]

Expected Behavior

jruby-9.2.0.0/bin/jruby -e 'Process.kill(:KILL, $$)'
No error occurs.

Actual Behavior

jruby-9.2.1.0/bin/jruby -e 'Process.kill(:KILL, $$)'

The following error occurred.

NotImplementedError: this signal not yet implemented in windows
    kill at org/jruby/RubyProcess.java:1341
    kill at org/jruby/RubyProcess.java:1262