Optional args that self-reference must resolve #2124
Description
See https://bugs.ruby-lang.org/issues/9593
The cases in question are in mri/ruby/test_syntax and look basically like this:
def foo(var = var) ...
def foo(var: defined?(var)) ......and so on. This will likely require parser changes. I am excluding test_keyword_self_reference and test_optional_self_reference now.
Note that test_keyword_self_reference actually triggers a Java exception inside IR:
TestSyntax#test_keyword_self_reference:
Java::JavaLang::ClassCastException: org.jruby.ir.operands.UndefinedValue cannot be cast to org.jruby.RubyBasicObject
org.jruby.runtime.callsite.CachingCallSite.getClass(CachingCallSite.java:401)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:125)
org.jruby.ir.interpreter.Interpreter.processCall(Interpreter.java:360)
org.jruby.ir.interpreter.Interpreter.interpret(Interpreter.java:595)
org.jruby.ir.interpreter.Interpreter.INTERPRET_METHOD(Interpreter.java:697)
org.jruby.internal.runtime.methods.InterpretedIRMethod.call(InterpretedIRMethod.java:116)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:255)
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83)