stacktrace for rubinius case-when issue

rbx_compile_output.log

$ rbx compile test.rb >log 2>&1

Failed compiling test.rb
An exception occurred running compile:

undefined method `body' on an instance of CodeTools::AST::PushArgs. (NoMethodError)

Backtrace:

                Kernel(CodeTools::AST::PushArgs)#body (method_missing) at kernel/delta/kernel.rb:78
                                CodeTools::AST::When#receiver_bytecode at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/control_flow.rbc:139
                          { } in CodeTools::AST::ReceiverCase#bytecode at /tmp/ruby-build.20150311174222.907/rubinius-2.5.2/staging/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/control_flow.rb:66
                                                            Array#each at kernel/bootstrap/array.rb:76
                                 CodeTools::AST::ReceiverCase#bytecode at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/control_flow.rbc:65
                                 { } in CodeTools::AST::Block#bytecode at /tmp/ruby-build.20150311174222.907/rubinius-2.5.2/staging/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/definitions.rb:96
                              { } in Enumerable(Array)#each_with_index at kernel/common/enumerable.rb:234
                                                            Array#each at kernel/bootstrap/array.rb:76
                                     Enumerable(Array)#each_with_index at kernel/common/enumerable.rb:232
                                        CodeTools::AST::Block#bytecode at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/definitions.rbc:94
                                { } in CodeTools::AST::Script#bytecode at /tmp/ruby-build.20150311174222.907/rubinius-2.5.2/staging/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/definitions.rb:1222
  CodeTools::AST::Container(CodeTools::AST::Script)#container_bytecode at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/definitions.rbc:1106
                                       CodeTools::AST::Script#bytecode at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-ast-2.3.1/lib/rubinius/ast/definitions.rbc:1221
                                     CodeTools::Compiler::Bytecode#run at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-compiler-2.3.1/lib/rubinius/compiler/stages.rbc:153
  CodeTools::Compiler::Stage(CodeTools::Compiler::FileParser)#run_next at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-compiler-2.3.1/lib/rubinius/compiler/stages.rbc:53
      CodeTools::Compiler::Parser(CodeTools::Compiler::FileParser)#run at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-compiler-2.3.1/lib/rubinius/compiler/stages.rbc:210
                                               CodeTools::Compiler#run at /home/malte/.rbenv/versions/rbx-2.5.2/runtime/gems/rubinius-compiler-2.3.1/lib/rubinius/compiler/compiler.rbc:359
                                   { } in CompilerScript#compile_files at /home/malte/.rbenv/versions/rbx-2.5.2/library/bin/compile.rb:203
                                                CompilerScript#protect at /home/malte/.rbenv/versions/rbx-2.5.2/library/bin/compile.rb:146
                                   { } in CompilerScript#compile_files at /home/malte/.rbenv/versions/rbx-2.5.2/library/bin/compile.rb:195
                                                            Array#each at kernel/bootstrap/array.rb:76
                                          CompilerScript#compile_files at /home/malte/.rbenv/versions/rbx-2.5.2/library/bin/compile.rb:185
                                                   CompilerScript#main at /home/malte/.rbenv/versions/rbx-2.5.2/library/bin/compile.rb:236
                                                     Object#__script__ at /home/malte/.rbenv/versions/rbx-2.5.2/library/bin/compile.rb:240
                                      Rubinius::CodeLoader#load_script at kernel/delta/code_loader.rb:66
                                      Rubinius::CodeLoader.load_script at kernel/delta/code_loader.rb:152
                                               Rubinius::Loader#script at kernel/loader.rb:655
                                                 Rubinius::Loader#main at kernel/loader.rb:809

test.rb

a = [1, 2]
case 3
when 3, *a
  puts 'works'
when *a, 3
  puts 'compiler error, but works in MRI'
end