mpz_gcdext bug in mini-gmp

[Torbjörn Granlund]

nisse at lysator.liu.se (Niels Möller) writes:

  Never access internal fields of mpz_t directly. If for any reason (this
  example has no good reason, as far as I see) one needs to use a limb
  array as input, use mpz_roinit_n.

I reacted about using Apple's infamous clang being used, but then I
hadn't understood that the reporter had played with GMP's internal
fields, setting up broken variable states.

Let's not spend time on this until we get a self-contained bug reports
as defined in the manual, which contains a well-defined test case.

-- 
Torbjörn
Please encrypt, key id 0xC8601622