fooがローカル変数になる

gistfile1.txt

== disasm: #<ISeq:<main>@./sample.rb>===================================
local table (size: 1, argc: 0 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
[ 1] a          
0000 putspecialobject 3                                               (   1)
0002 putnil           
0003 defineclass      :A, <class:A>, 0
0007 pop              
0008 getinlinecache   15, <is:0>                                      (  13)
0011 getconstant      :A
0013 setinlinecache   <is:0>
0015 send             <callinfo!mid:new, argc:0, ARGS_SIMPLE>, <callcache>, nil
0019 setlocal         a, 0
0022 getlocal         a, 0                                            (  14)
0025 putobject        1
0027 send             <callinfo!mid:foo=, argc:1, ARGS_SIMPLE>, <callcache>, nil
0031 pop              
0032 putself                                                          (  15)
0033 getlocal         a, 0
0036 send             <callinfo!mid:bar, argc:0, ARGS_SIMPLE>, <callcache>, nil
0040 send             <callinfo!mid:p, argc:1, FCALL|ARGS_SIMPLE>, <callcache>, nil
0044 leave            
== disasm: #<ISeq:<class:A>@./sample.rb>================================
0000 putself                                                          (   2)
0001 putobject        :foo
0003 send             <callinfo!mid:attr_accessor, argc:1, FCALL|ARGS_SIMPLE>, <callcache>, nil
0007 pop              
0008 putspecialobject 1                                               (   3)
0010 putobject        :bar
0012 putiseq          bar
0014 send             <callinfo!mid:core#define_method, argc:2, ARGS_SIMPLE>, <callcache>, nil
0018 pop              
0019 putspecialobject 1                                               (   8)
0021 putobject        :baz
0023 putiseq          baz
0025 send             <callinfo!mid:core#define_method, argc:2, ARGS_SIMPLE>, <callcache>, nil
0029 leave            
== disasm: #<ISeq:bar@./sample.rb>======================================
local table (size: 1, argc: 0 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
[ 1] foo        
0000 putself                                                          (   4)
0001 getlocal         foo, 0 <================ ここでローカル変数fooが定義されている
0004 send             <callinfo!mid:baz, argc:1, FCALL|ARGS_SIMPLE>, <callcache>, nil
0008 setlocal         foo, 0
0011 getlocal         foo, 0                                          (   5)
0014 leave            
== disasm: #<ISeq:baz@./sample.rb>======================================
local table (size: 1, argc: 1 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
[ 1] v<Arg>     
0000 getlocal         v, 0                                            (   9)
0003 leave