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[Frama-c-discuss] WP: assigns needed to prove function contract?

  • Subject: [Frama-c-discuss] WP: assigns needed to prove function contract?
  • From: dmentre at linux-france.org (David MENTRE)
  • Date: Mon, 9 Sep 2013 09:42:59 +0200
Hello,

In the attached find.c example, everything is proved with WP (loop
invariant, function contract).

However, if I remove the "loop assigns i;" in the for loop, the
ensures clauses of the function contract are not proved any more. Can
somebody explain to me why, as I think my loop invariant is building
all the information needed to prove the ensures clauses.

As far as I remember, this was not the case with previous version of
Frama-C (or with Jessie?).

Best regards,
david
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