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(C5) setting f_lineno didn't evolve when the rest of the bytecodes evolved,
 which means it is not safe any more::
 import sys
 def f():
 try:
 raise ValueError # line 5
 except ValueError:
 print(42) # line 7
 def my_trace(*args):
 print(args)
 if args[1] == 'line':
 f = args[0]
 if f.f_lineno == 5:
 f.f_lineno = 7
 return my_trace
 sys.settrace(my_trace)
 f()
 sys.settrace(None)