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Diffstat (limited to 'test-suite/bugs/opened/4717.v')
| -rw-r--r-- | test-suite/bugs/opened/4717.v | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test-suite/bugs/opened/4717.v b/test-suite/bugs/opened/4717.v new file mode 100644 index 00000000..9ad47467 --- /dev/null +++ b/test-suite/bugs/opened/4717.v @@ -0,0 +1,19 @@ +(*See below. They sometimes work, and sometimes do not. Is this a bug?*) + +Require Import Omega Psatz. + +Definition foo := nat. + +Goal forall (n : foo), 0 = n - n. +Proof. intros. omega. (* works *) Qed. + +Goal forall (x n : foo), x = x + n - n. +Proof. + intros. + Fail omega. (* Omega can't solve this system *) + Fail lia. (* Cannot find witness. *) + unfold foo in *. + omega. (* works *) +Qed. + +(* Guillaume Melquiond: What matters is the equality. In the first case, it is @eq nat. In the second case, it is @eq foo. The same issue exists for ring and field. So it is not a bug, but it is worth fixing.*) |