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[Marius Kintel <>]

Hi,

Polyhedron_incremental_builder_3::test_facet_indices() tries to detect if a 
list of indices has the same index specified twice.
Due to a bug, this test doesn’t actually detect that in all cases:
e.g., sending the vector [6,6,5,6] will pass this test while it should 
obviously fail.

The problem appears to be on line 752:
        for ( std::size_t k = 0; k+1 < i; ++k) {

..where k is being iterated one step too short to detect this issue.

 -Marius