> On my machine the following code creates a segfault if
> finite_semigroup-nt.patch is applied and works if not.
>
>    sage: G = DiGraph()
>    sage: G.add_vertices([1, 6, 9])
>    sage: G.add_edges([(9, 1, None), (9, 6, None)])
>    sage: G.automorphism_group()

my machine returns

sage:    sage: G.automorphism_group()
Permutation Group with generators [(1,3)]

with 4.7.2.

Best, Christian

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