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euler:rubinius brian$ echo "dispatch(obj, meth, dispatch(obj, meth, obj))" > script.rb
euler:rubinius brian$ shotgun/rubinius describe script.rb 
Sexp:
[:newline,
 1,
 "script.rb",
 [:fcall,
  :dispatch,
  [:array,
   [:vcall, :obj],
   [:vcall, :meth],
   [:fcall,
    :dispatch,
    [:array, [:vcall, :obj], [:vcall, :meth], [:vcall, :obj]]]]]]

Bytecode:
0000:  push_self                  
0001:  set_call_flags             1
0003:  send_method                #<SendSite:0x91 name=obj hits=0 misses=0>
0005:  push_self                  
0006:  set_call_flags             1
0008:  send_method                #<SendSite:0xb1 name=meth hits=0 misses=0>
0010:  push_self                  
0011:  set_call_flags             1
0013:  send_method                #<SendSite:0xd1 name=obj hits=0 misses=0>
0015:  push_self                  
0016:  set_call_flags             1
0018:  send_stack                 #<SendSite:0xf1 name=dispatch hits=0 misses=0>, 3
0021:  push_self                  
0022:  set_call_flags             1
0024:  send_method                #<SendSite:0x111 name=meth hits=0 misses=0>
0026:  push_self                  
0027:  set_call_flags             1
0029:  send_method                #<SendSite:0x131 name=obj hits=0 misses=0>
0031:  push_self                  
0032:  set_call_flags             1
0034:  send_stack                 #<SendSite:0x151 name=dispatch hits=0 misses=0>, 3
0037:  pop                        
0038:  push_true                  
0039:  sret