Bug #1838: str[0,1]||='H' results Stack consistency error
http://redmine.ruby-lang.org/issues/show/1838

Author: Heesob Park
Status: Open, Priority: Normal
Category: core, Target version: 1.9.1
ruby -v: ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

$ ruby -e '"hello"[0,1]||="H"'
-e:1: [BUG] Stack consistency error (sp: 7, bp: 6)
ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

-- control frame ----------
c:0003 p:0035 s:0007 b:0006 l:00149c d:0006cc EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:00149c d:00149c TOP
---------------------------
-- Ruby level backtrace information-----------------------------------------
-e:1:in `<main>'

-- C level backtrace information -------------------------------------------
0x811c1c8 ruby(rb_vm_bugreport+0x48) [0x811c1c8]
0x81483c8 ruby [0x81483c8]
0x814844b ruby(rb_bug+0x2b) [0x814844b]
0x811550d ruby [0x811550d]
0x8115fe5 ruby [0x8115fe5]
0x8116125 ruby(rb_iseq_eval_main+0x95) [0x8116125]
0x805a92f ruby(ruby_exec_node+0x9f) [0x805a92f]
0x805b982 ruby(ruby_run_node+0x42) [0x805b982]
0x80594f0 ruby(main+0x60) [0x80594f0]
0xb49dec /lib/libc.so.6(__libc_start_main+0xdc) [0xb49dec]
0x80593d1 ruby [0x80593d1]

[NOTE]
You may encounter a bug of Ruby interpreter. Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html


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