SEGV by removing undefined method

e$B0J2<$N$h$&$K$9$k$He(B SEGV e$B$7$^$9!#e(B

% ./ruby -e ’
class C
undef display
remove_method :display
end

-e:4: – control frame ----------
c:0005 p:---- s:0011 b:0011 l:000010 d:000010 CFUNC :remove_method
c:0004 p:0011 s:0007 b:0007 l:000006 d:000006 CLASS -e:4
c:0003 p:0006 s:0005 b:0005 l:000004 d:000004 TOP -e:2
c:0002 p:---- s:0003 b:0003 l:000002 d:000002 FINISH :inherited
c:0001 p:---- s:0001 b:-001 l:000000 d:000000 ------

DBG> : “-e:4:in <class:C>'" DBG> : "-e:2:in'”
– backtrace of native function call (Use addr2line) –
0x80f7eb2
0x811466c
0x811470b
0x80c1791
0xb7f61420
0x8058ca8
0x80edf5a
0x80f59e1
0x80f5570
0x80f1daf
0x80f5bba
0x80f61ff
0x805a47d
0x805a500
0x80576c5
0xb7dcaea8
0x80575f1