Hi there,

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()
    ****BBBBOOOOMMMM****

Can someone confirm that the segfault happen on other machine ?

For Nicolas: could it be related to the recent work on categories ?

Cheers,

Florent

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