args.rb

def []=(*args)
  p args
end

a = ['a']

self[1,*a,2] = 2

crashreport.txt

Rubinius Crash Report #rbxcrashreport

[[Exception]]
A toplevel exception occurred
    Error trying to compile /Users/james/rubies/main/Languages/Ruby/Tests/Experiments/19/args.rb (Rubinius::CompileError)

Backtrace:
 Rubinius::Compiler.compiler_error at /Users/james/.rvm/rubies/rbx-head/runtime
                                      /19/compiler/compiler.rbc:13
        Rubinius::Compiler.compile at /Users/james/.rvm/rubies/rbx-head/runtime
                                      /19/compiler/compiler.rbc:88
  Rubinius::CodeLoader#compile_file at kernel/delta/codeloader.rb:166
     Rubinius::CodeLoader#load_file at kernel/delta/codeloader.rb:138
   Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:63
   Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:109
            Rubinius::Loader#script at kernel/loader.rb:630
              Rubinius::Loader#main at kernel/loader.rb:834

Caused by: undefined method `size' on an instance of Rubinius::AST::PushArgs. (NoMethodError)

Backtrace:
 Kernel(Rubinius::AST::PushArgs)#size (method_missing) at kernel/delta
                                                          /kernel.rb:81
 Rubinius::AST::PushActualArguments#size at /Users/james/.rvm/rubies/rbx-head
                                            /runtime/19/compiler/ast
                                            /sends.rbc:295
 Rubinius::AST::ElementAssignment#bytecode at /Users/james/.rvm/rubies/rbx-head
                                              /runtime/19/compiler/ast
                                              /sends.rbc:239
 { } in Rubinius::AST::Block#bytecode at /Users/james/.rvm/rubies/rbx-head
                                         /runtime/19/compiler/ast
                                         /definitions.rbc:96
  { } in Enumerable(Array)#each_with_index at kernel/common/enumerable19.rb:447
                            Array#each at kernel/bootstrap/array.rb:68
     Enumerable(Array)#each_with_index at kernel/common/enumerable19.rb:446
        Rubinius::AST::Block#bytecode at /Users/james/.rvm/rubies/rbx-head
                                         /runtime/19/compiler/ast
                                         /definitions.rbc:94
 { } in Rubinius::AST::Script#bytecode at /Users/james/.rvm/rubies/rbx-head
                                          /runtime/19/compiler/ast
                                          /definitions.rbc:1073
  Rubinius::AST::Container(Rubinius::AST::Script)#container_bytecode at \
          /Users/james/.rvm/rubies/rbx-head/runtime/19/compiler/ast/definitions.rbc:956
       Rubinius::AST::Script#bytecode at /Users/james/.rvm/rubies/rbx-head
                                         /runtime/19/compiler/ast
                                         /definitions.rbc:1072
    Rubinius::Compiler::Generator#run at /Users/james/.rvm/rubies/rbx-head
                                         /runtime/19/compiler/stages.rbc:153
  Rubinius::Compiler::Stage(Rubinius::Compiler::FileParser)#run_next at \
          /Users/james/.rvm/rubies/rbx-head/runtime/19/compiler/stages.rbc:53
  Rubinius::Compiler::Parser(Rubinius::Compiler::FileParser)#run at \
          /Users/james/.rvm/rubies/rbx-head/runtime/19/compiler/stages.rbc:220
               Rubinius::Compiler#run at /Users/james/.rvm/rubies/rbx-head
                                         /runtime/19/compiler/compiler.rbc:370
           Rubinius::Compiler.compile at /Users/james/.rvm/rubies/rbx-head
                                         /runtime/19/compiler/compiler.rbc:84
     Rubinius::CodeLoader#compile_file at kernel/delta/codeloader.rb:166
        Rubinius::CodeLoader#load_file at kernel/delta/codeloader.rb:138
      Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:63
      Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:109
               Rubinius::Loader#script at kernel/loader.rb:630
                 Rubinius::Loader#main at kernel/loader.rb:834

[[Version]]
rubinius 2.0.0dev (1.9.3 f4645d6c yyyy-mm-dd JI) [x86_64-apple-darwin11.2.0]