Do not forget to define ambient_field before computing its algebraic closure.

Jean-Pierre Flori · Jean-Pierre Flori · commit 2bedaa181f50 · 2014-03-12T09:00:42.000-07:00
diff --git a/src/sage/rings/number_field/number_field_morphisms.pyx b/src/sage/rings/number_field/number_field_morphisms.pyx
@@ -194,6 +194,7 @@ cdef class EmbeddedNumberFieldMorphism(NumberFieldEmbedding):
             while Lemb.coerce_embedding() is not None:
                 Lemb = Lemb.coerce_embedding().codomain()
             ambient_field = pushout(Kemb, Lemb)
+            candidate_ambient_fields = [ambient_field]
             try:
                 candidate_ambient_fields.append(ambient_field.algebraic_closure())
             except NotImplementedError:
