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SageManifold example broken in SageMath 7.3

The example SM_sphere_S2 breaks when it gets to section 'Tangent Spaces', thus:

AttributeError: 'DifferentiableManifold_with_category' object has no attribute 'tangent_space'.

referring to the manifold S2.

SageManifold example broken in SageMath 7.3

The example SM_sphere_S2 breaks when it gets to section 'Tangent Spaces', thus:

AttributeError: 'DifferentiableManifold_with_category' object has no attribute 'tangent_space'.

referring to the manifold S2.

Why would a differentiable manifold not have a tangent space? or does the example need to be modified?