call site 0 for code.Source.putaround
code/testing/test_source.py - line 46
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   def test_source_putaround_simple():
       source = Source("raise ValueError")
       source = source.putaround(
           "try:", """\
           except ValueError:
               x = 42
           else:
->             x = 23""")
       assert str(source)=="""\
   try:
       raise ValueError
   except ValueError:
       x = 42
   else:
       x = 23"""