# Breakpoint 1, PyUnicodeEncodeError_GetEnd (exc=<X at remote 0x405730e4>, end=0xbf9e8f7c) at Objects/exceptions.c:1643
# 1643        PyObject *obj = get_unicode(((PyUnicodeErrorObject *)exc)->object,
# (gdb) s
# get_unicode (attr=<unknown at remote 0x8c6a120>, name=0x82765ea "object") at Objects/exceptions.c:1516
# 1516        if (!attr) {
# (gdb) print *attr
# $4 = {_ob_next = 0xfefefefe, _ob_prev = 0xfefefefe, ob_refcnt = -16843010, ob_type = 0xfefefefe}
# (gdb) c
# Continuing.
# 
# Program received signal SIGSEGV, Segmentation fault.
# 0x080bc7d9 in get_unicode (attr=<unknown at remote 0x8cbe250>, name=0x82765ea "object") at Objects/exceptions.c:1521
# 1521        if (!PyUnicode_Check(attr)) {
#
# Type confusion. IsInstance check is ineffective because of custom 
# __getattribute__ method. Contents of string instance is interpreted as
# an exception object.

import codecs as c

errs = [c.ignore_errors, c.replace_errors, c.xmlcharrefreplace_errors, 
    c.backslashreplace_errors] 

class X(str):
  def __getattribute__(self, a):
    
    return UnicodeEncodeError

def f(i):
  x = X("\xfe"*1024)
  f_err = errs[i]
  f_err(x)

#argument: 0..3
f(0)