% JAVA_HOME=/home/nahi/java/openjdk-hotspot-comp-20110901-plus-switchpoint jruby -v foo.rb
jruby 1.7.0.dev (ruby-1.8.7-p330) (2011-09-02 ee230a0) (OpenJDK 64-Bit Server VM 1.7.0_02-ea) [linux-amd64-java]
% cat foo.rb
require 'set'
s = Set.new
1.upto(50) { s & ['bar'] }
% JAVA_HOME=/home/nahi/java/openjdk-hotspot-comp-20110901-plus-switchpoint jruby -Xinvokedynamic.all=true foo.rb
MethodHandleStatics.java:102:in `newIllegalArgumentException': java.lang.IllegalArgumentException: target and fallback types must match: (ThreadContext,IRubyObject,IRubyObject,String,IRubyObject)IRubyObject != (JRubyCallSite,ThreadContext,IRubyObject,IRubyObject,String,IRubyObject)IRubyObject
	from MethodHandles.java:2166:in `misMatchedTypes'
	from MethodHandles.java:2150:in `guardWithTest'
	from SwitchPoint.java:173:in `guardWithTest'
	from InvokeDynamicSupport.java:660:in `updateInvocationTarget'
	from InvokeDynamicSupport.java:475:in `invocationFallback'
	from foo.rb:3:in `block_0$RUBY$__file__'
	from foo$block_0$RUBY$__file__:65535:in `call'
	from CompiledBlock.java:112:in `yield'
	from CompiledBlock.java:95:in `yield'
	from Block.java:130:in `yield'
	from RubyInteger.java:150:in `fixnumUpto'
	from RubyInteger.java:135:in `upto'
	from MethodHandleImpl.java:1162:in `invoke_L6'
	from MethodHandleImpl.java:1162:in `invoke_L6'
	from MethodHandle.java:566:in `invokeWithArguments'
	from InvokeDynamicSupport.java:560:in `invocationFallback'
	from foo.rb:3:in `__file__'
	from foo.rb:-1:in `load'
	from Ruby.java:715:in `runScript'
	from Ruby.java:708:in `runScript'
	from Ruby.java:615:in `runNormally'
	from Ruby.java:464:in `runFromMain'
	from Main.java:317:in `doRunFromMain'
	from Main.java:237:in `internalRun'
	from Main.java:203:in `run'
	from Main.java:187:in `run'
	from Main.java:167:in `main'