Calling a method with multiple unknown keywords arguments in CRuby results in an Argument Error listing all unknown keywords.
In JRuby only the first unknown keyword is present in the error message.

Example

def foo(bar: 'baz'); end
foo(blah: nil, blah2: nil)

Expected Behavior

ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]

test.rb:1:in `foo': unknown keywords: blah, blah2 (ArgumentError)
	from test.rb:2:in `<main>'

Actual Behavior

jruby 9.1.9.0-SNAPSHOT (2.3.3) 2017-03-21 e7bcde5 Java HotSpot(TM) 64-Bit Server VM 25.121-b13 on 1.8.0_121-b13 [darwin-x86_64]

ArgumentError: unknown keyword: blah
     foo at test.rb:2
  <main> at test.rb:2

jruby 9.1.8.0 (2.3.1) 2017-03-06 90fc7ab Java HotSpot(TM) 64-Bit Server VM 25.121-b13 on 1.8.0_121-b13 [darwin-x86_64]

ArgumentError: unknown keyword: blah
     foo at test.rb:2
  <main> at test.rb:2