Failed example:: Exception raised: Traceback (most recent call last): File "/sage/src/sage/doctest/forker.py", line 715, in _run self.compile_and_execute(example, compiler, test.globs) File "/sage/src/sage/doctest/forker.py", line 1145, in compile_and_execute exec(compiled, globs) File "<doctest sage.rings.universal_cyclotomic_field.UniversalCyclotomicField._element_constructor_[15]>", line 1, in <module> UCF(Integer(1) + sqrt(-Integer(3)/Integer(5))) # needs sage.symbolic File "sage/structure/parent.pyx", line 901, in sage.structure.parent.Parent.__call__ return mor._call_(x) File "sage/structure/coerce_maps.pyx", line 164, in sage.structure.coerce_maps.DefaultConvertMap_unique._call_ raise File "sage/structure/coerce_maps.pyx", line 159, in sage.structure.coerce_maps.DefaultConvertMap_unique._call_ return C._element_constructor(x) File "/sage/src/sage/rings/universal_cyclotomic_field.py", line 1551, in _element_constructor_ return elt._algebraic_(self) File "sage/symbolic/expression.pyx", line 2027, in sage.symbolic.expression.Expression._algebraic_ return algebraic(self, field) File "/sage/src/sage/symbolic/expression_conversion_algebraic.py", line 308, in algebraic return AlgebraicConverter(field)(ex) File "/sage/src/sage/symbolic/expression_conversions.py", line 212, in __call__ return self.arithmetic(ex, operator) File "/sage/src/sage/symbolic/expression_conversion_algebraic.py", line 130, in arithmetic raise TypeError("unable to convert %r to %s" % (ex, self.field)) TypeError: unable to convert sqrt(-3/5) + 1 to Universal Cyclotomic Field