Raised when a system has no solution.

solve_congruences @@ List.to_seq [ (a1, b1, m1) ; … ; (ak, bk, mk) ], provided that the m_i are non-zero, solves the following linear congruence system of unknown x:

• a₁ · x ≡_m1 b₁
• …
• a_k · x ≡_mk b_k

TODO: complexity?

• returns

  a pair (x, m) where 0 ≤ x < m, which represents the set of solutions x + mℤ,

• raises No_solution

  if there are no solutions.