Hello,

I have developped some tools that works well with several versions of sage, 
but it doesn't work well with sage 6.2.
When I try to modify the file sage/combinat/words/morphism.py, I get the 
following error :

iMac-de-Paul-Mercat:sage-6.2 mercat$ ./sage -n
┌────────────────────────────────────────────────────────────────────┐
│ Sage Version 6.2, Release Date: 2014-05-06                         │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘

Please wait while the Sage Notebook server starts...
Traceback (most recent call last):
  File "/Applications/sage-6.2/src/bin/sage-notebook", line 9, in <module>
    from sage.all import *
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/all.py", 
line 103, in <module>
    import sage.symbolic.pynac
  File "pynac.pyx", line 2269, in init sage.symbolic.pynac 
(sage/symbolic/pynac.cpp:23271)
  File "pynac.pyx", line 2163, in sage.symbolic.pynac.init_pynac_I 
(sage/symbolic/pynac.cpp:20350)
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py",
 
line 739, in QuadraticField
    return NumberField(f, name, check=False, embedding=embedding, 
latex_name=latex_name, **args)
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py",
 
line 461, in NumberField
    assume_disc_small=assume_disc_small, 
maximize_at_primes=maximize_at_primes)
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py",
 
line 9120, in __init__
    self._standard_embedding = CDF.has_coerce_map_from(self) and 
CDF(rootD).imag() > 0
  File "complex_double.pyx", line 336, in 
sage.rings.complex_double.ComplexDoubleField_class.__call__ 
(sage/rings/complex_double.c:4633)
  File "parent.pyx", line 1070, in sage.structure.parent.Parent.__call__ 
(sage/structure/parent.c:8858)
  File "map.pyx", line 1604, in 
sage.categories.map.FormalCompositeMap._call_ (sage/categories/map.c:8852)
  File "number_field_morphisms.pyx", line 135, in 
sage.rings.number_field.number_field_morphisms.NumberFieldEmbedding._call_ 
(sage/rings/number_field/number_field_morphisms.c:2889)
  File "polynomial_rational_flint.pyx", line 491, in 
sage.rings.polynomial.polynomial_rational_flint.Polynomial_rational_flint.__call__
 
(sage/rings/polynomial/polynomial_rational_flint.cpp:7981)
  File "polynomial_element.pyx", line 657, in 
sage.rings.polynomial.polynomial_element.Polynomial.__call__ 
(sage/rings/polynomial/polynomial_element.c:8264)
  File "element.pyx", line 806, in 
sage.structure.element.Element.__nonzero__ (sage/structure/element.c:7908)
  File "real_lazy.pyx", line 667, in 
sage.rings.real_lazy.LazyFieldElement.__richcmp__ 
(sage/rings/real_lazy.c:7836)
  File "element.pyx", line 902, in sage.structure.element.Element._richcmp 
(sage/structure/element.c:9316)
  File "element.pyx", line 949, in 
sage.structure.element.Element._richcmp_c_impl 
(sage/structure/element.c:9645)
  File "real_lazy.pyx", line 655, in 
sage.rings.real_lazy.LazyFieldElement._cmp_c_impl 
(sage/rings/real_lazy.c:7739)
  File "real_lazy.pyx", line 738, in 
sage.rings.real_lazy.LazyFieldElement.approx (sage/rings/real_lazy.c:8383)
  File "real_lazy.pyx", line 1626, in 
sage.rings.real_lazy.LazyAlgebraic.eval (sage/rings/real_lazy.c:15292)
  File "polynomial_element.pyx", line 5737, in 
sage.rings.polynomial.polynomial_element.Polynomial.roots 
(sage/rings/polynomial/polynomial_element.c:37505)
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/rings/polynomial/complex_roots.py",
 
line 349, in complex_roots
    factors = p.squarefree_decomposition()
  File "polynomial_element.pyx", line 1332, in 
sage.rings.polynomial.polynomial_element.Polynomial.squarefree_decomposition 
(sage/rings/polynomial/polynomial_element.c:14176)
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/structure/factorization.py",
 
line 305, in __init__
    self.__universe = Sequence(t[0] for t in x).universe()
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/structure/sequence.py",
 
line 289, in Sequence
    from sage.rings.polynomial.pbori import BooleanMonomialMonoid
  File "pbori.pyx", line 215, in init sage.rings.polynomial.pbori 
(sage/rings/polynomial/pbori.cpp:59841)
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/monoids/__init__.py",
 
line 1, in <module>
    import all
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/monoids/all.py", 
line 3, in <module>
    from free_monoid import FreeMonoid, is_FreeMonoid
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/monoids/free_monoid.py",
 
line 39, in <module>
    from sage.combinat.words.finite_word import FiniteWord_class
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/combinat/words/__init__.py",
 
line 1, in <module>
    import all
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/combinat/words/all.py",
 
line 2, in <module>
    from morphism import WordMorphism
  File 
"/Applications/sage-6.2/local/lib/python2.7/site-packages/sage/combinat/words/morphism.py",
 
line 2401
    <<<<<<< HEAD
     ^
SyntaxError: invalid syntax

And even if I replace the file by its original version, it still doesn't 
work.

I've tried to cythonize the file : I replaced it by morphism.pyx and 
indicate it in module_list.py, and then it works ! But it doesn't that into 
account what I write in morphism.pyx, it does the same as if there were 
still the original file morphism.py

Very strange is't it ?
Do somebody understand what's wrong and knows how to correct the problem ?

Thank,
Paul

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