TypeError raised by JRuby during keyword argument checking while the call is perfectly legit #3760
Description
Environment
jruby 9.0.5.0 (2.2.3) 2016-01-26 7bee00d Java HotSpot(TM) 64-Bit Server VM 25.77-b03 on 1.8.0_77-b03 +jit [linux-amd64] on Linux squidock 4.5.0-040500-generic #201603140130 SMP Mon Mar 14 05:32:22 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux (Kubuntu 15.10)
Ran with --debug -G, but the problem also appears with no command line options.
Noteworthy gems: facets (but not only very little of it activated), concurrent-ruby. The code that causes the problem is not multithreaded.
Expected Behaviour
I'm calling a method whose signature is def process_events_synchronous(seeds = Hash.new, initial_errors = Array.new, enable_scheduler: false) The call line is engine.process_events_synchronous(seeds)
Links to the actual called method and the calling site
To reproduce,
git clone https://github.com/rock-core/tools-roby -b roby3
cd tools-roby
bundle install
ruby test/test_event_generator.rb -n /test_emit_without_propagation/
I expect to enter the called method.
Actual Behaviour
JRuby raises a TypeError exception complaining that XXXX is not a string where 'XXX' looks like the result of the caller's #inspect. The first line of the TypeError backtrace on the Ruby side is bogus (see #3624). Removing the keyword argument enable_scheduler makes the call pass as expected. The full backtrace reports
java/lang/Thread.java:1552:in `getStackTrace'
org/jruby/runtime/backtrace/TraceType.java:215:in `getBacktraceData'
org/jruby/runtime/backtrace/TraceType.java:47:in `getBacktrace'
org/jruby/RubyException.java:225:in `prepareBacktrace'
org/jruby/exceptions/RaiseException.java:229:in `preRaise'
org/jruby/exceptions/RaiseException.java:196:in `preRaise'
org/jruby/exceptions/RaiseException.java:111:in `<init>'
org/jruby/Ruby.java:4066:in `newRaiseException'
org/jruby/Ruby.java:3828:in `newTypeError'
org/jruby/RubyBasicObject.java:689:in `asJavaString'
org/jruby/ir/runtime/IRRuntimeHelpers.java:592:in `visit'
org/jruby/RubyHash.java:650:in `visitLimited'
org/jruby/RubyHash.java:636:in `visitAll'
org/jruby/ir/runtime/IRRuntimeHelpers.java:589:in `checkForExtraUnwantedKeywordArgs'
org/jruby/ir/runtime/IRRuntimeHelpers.java:543:in `checkArity'
org/jruby/ir/instructions/CheckArityInstr.java:69:in `checkArity'
org/jruby/ir/interpreter/InterpreterEngine.java:390:in `processBookKeepingOp'
org/jruby/ir/interpreter/StartupInterpreterEngine.java:111:in `interpret'
org/jruby/ir/interpreter/InterpreterEngine.java:86:in `interpret'
org/jruby/internal/runtime/methods/InterpretedIRMethod.java:193:in `INTERPRET_METHOD'
/home/doudou/dev/rock/toolchain-devel/jruby/tools-roby/lib/roby/execution_engine.rb:661:in `process_events_synchronous'
org/jruby/internal/runtime/methods/InterpretedIRMethod.java:180:in `call'
org/jruby/internal/runtime/methods/DynamicMethod.java:197:in `call'
org/jruby/runtime/callsite/CachingCallSite.java:313:in `cacheAndCall'
org/jruby/runtime/callsite/CachingCallSite.java:163:in `call'
org/jruby/ir/interpreter/InterpreterEngine.java:316:in `processCall'
org/jruby/ir/interpreter/StartupInterpreterEngine.java:77:in `interpret'
org/jruby/ir/interpreter/InterpreterEngine.java:80:in `interpret'
org/jruby/internal/runtime/methods/InterpretedIRMethod.java:165:in `INTERPRET_METHOD'
/home/doudou/dev/rock/toolchain-devel/jruby/tools-roby/lib/roby/event_generator.rb:661:in `emit'