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Diffstat (limited to 'test-suite/bugs/closed/shouldsucceed/2136.v')
| -rw-r--r-- | test-suite/bugs/closed/shouldsucceed/2136.v | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/test-suite/bugs/closed/shouldsucceed/2136.v b/test-suite/bugs/closed/shouldsucceed/2136.v new file mode 100644 index 00000000..d2b926f3 --- /dev/null +++ b/test-suite/bugs/closed/shouldsucceed/2136.v @@ -0,0 +1,61 @@ +(* Bug #2136 + +The fsetdec tactic seems to get confused by hypotheses like + HeqH1 : H1 = MkEquality s0 s1 b +If I clear them then it is able to solve my goal; otherwise it is not. +I would expect it to be able to solve the goal even without this hypothesis +being cleared. A small, self-contained example is below. + +I have coq r12238. + + +Thanks +Ian +*) + + +Require Import FSets. +Require Import Arith. +Require Import FSetWeakList. + +Module DecidableNat. +Definition t := nat. +Definition eq := @eq nat. +Definition eq_refl := @refl_equal nat. +Definition eq_sym := @sym_eq nat. +Definition eq_trans := @trans_eq nat. +Definition eq_dec := eq_nat_dec. +End DecidableNat. + +Module NatSet := Make(DecidableNat). + +Module Export Dec := WDecide (NatSet). +Import FSetDecideAuxiliary. + +Parameter MkEquality : forall ( s0 s1 : NatSet.t ) + ( x : nat ), + NatSet.Equal s1 (NatSet.add x s0). + +Lemma ThisLemmaWorks : forall ( s0 s1 : NatSet.t ) + ( a b : nat ), + NatSet.In a s0 + -> NatSet.In a s1. +Proof. +intros. +remember (MkEquality s0 s1 b) as H1. +clear HeqH1. +fsetdec. +Qed. + +Lemma ThisLemmaWasFailing : forall ( s0 s1 : NatSet.t ) + ( a b : nat ), + NatSet.In a s0 + -> NatSet.In a s1. +Proof. +intros. +remember (MkEquality s0 s1 b) as H1. +fsetdec. +(* +Error: Tactic failure: because the goal is beyond the scope of this tactic. +*) +Qed.
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