Hi there,
I'm having trouble with coercion in sage 4.2...
The following (reduced) example works with sage 4.1.2 and breaks with sage
4.2. Here is the error:
File "<doctest __main__.example_0[2]>", line 1, in <module>
bla = Essai(); bla###line 11:
sage: bla = Essai(); bla
File "/home/averell/.sage/tmp/wrapp.py", line 16, in __init__
mor.register_as_coercion()
File "morphism.pyx", line 116, in
sage.categories.morphism.Morphism.register_as_coercion
(sage/categories/morphism.c:2371)
File "parent.pyx", line 1018, in
sage.structure.parent.Parent.register_coercion (sage/structure/parent.c:8301)
File "parent.pyx", line 1043, in
sage.structure.parent.Parent.register_coercion (sage/structure/parent.c:8090)
AssertionError: coercions must all be registered up before use
Any help or suggestion ?
Cheers,
Florent
from sage.structure.parent import Parent
from sage.rings.integer_ring import IntegerRing
from sage.categories.homset import Hom
class Essai(Parent):
"""
TESTS::
sage: bla = Essai(); bla
<class 'wrapp.Essai'>
"""
def __init__(self):
Parent.__init__(self)
mor = Hom(self, IntegerRing())(lambda z: 1)
mor.register_as_coercion()
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