From e1f5180e88bf02a22c954ddbdcbdfeb168d264a6 Mon Sep 17 00:00:00 2001 From: herbelin Date: Sun, 15 Apr 2012 22:06:11 +0000 Subject: Fixing tauto "special" behavior on singleton types w/ 2 parameters (bug #2680). - tauto/intuition now works uniformly on and, prod, or, sum, False, Empty_set, unit, True (and isomorphic copies of them), iff, ->, and on all inhabited singleton types with a no-arguments constructor such as "eq t t" (even though the last case goes out of propositional logic: this features is so often used that it is difficult to come back on it). - New dtauto and dintuition works on all inductive types with one constructors and no real arguments (for instance, they work on records such as "Equivalence"), in addition to -> and eq-like types. - Moreover, both of them no longer unfold inner negations (this is a souce of incompatibility for intuition and evaluation of the level of incompatibility on contribs still needs to be done). Incidentally, and amazingly, fixing bug #2680 made that constants InfA_compat and InfA_eqA in SetoidList.v lost one argument: old tauto had indeed destructed a section hypothesis "@StrictOrder A ltA@ thinking it was a conjunction, making this section hypothesis artificially necessary while it was not. Renouncing to the unfolding of inner negations made auto/eauto sometimes succeeding more, sometimes succeeding less. There is by the way a (standard) problem with not in auto/eauto: even when given as an "unfold hint", it works only in goals, not in hypotheses, so that auto is not able to solve something like "forall P, (forall x, ~ P x) -> P 0 -> False". Should we automatically add a lemma of type "HYPS -> A -> False" in the hint database everytime a lemma ""HYPS -> ~A" is declared (and "unfold not" is a hint), and similarly for all unfold hints? At this occasion, also re-did some proofs of Znumtheory. git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@15180 85f007b7-540e-0410-9357-904b9bb8a0f7 --- test-suite/bugs/closed/shouldsucceed/2680.v | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 test-suite/bugs/closed/shouldsucceed/2680.v (limited to 'test-suite/bugs') diff --git a/test-suite/bugs/closed/shouldsucceed/2680.v b/test-suite/bugs/closed/shouldsucceed/2680.v new file mode 100644 index 0000000000..0f573a2898 --- /dev/null +++ b/test-suite/bugs/closed/shouldsucceed/2680.v @@ -0,0 +1,17 @@ +(* Tauto bug initially due to wrong test for binary connective *) + +Parameter A B : Type. + +Axiom P : A -> B -> Prop. + +Inductive IP (a : A) (b: B) : Prop := +| IP_def : P a b -> IP a b. + + +Goal forall (a : A) (b : B), IP a b -> ~ IP a b -> False. +Proof. + intros. + tauto. +Qed. + + -- cgit v1.2.3