Comments (2)
Thanks Michael, I can reproduce the bug and am working to root-cause it.
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I've root-caused the bug to some mishandling of disequalities during rewriting. For example, given the rewrite f X = c, the clause ~(f Y = g a b) / p (g a b) should be rewritten to ~(c = g a b) / p c in one step, but the buggy code caused the rewrite to return ~(c = g a b) / p (g a b). If this clause was rewritten again it would correctly return ~(c = g a b) / p c, but it shouldn't take two steps to do this.
I've released a new version - Metis 2.3 (release 20171021) - that fixes this and will shortly push a commit that closes this issue.
Thank you for the bug report, please keep them coming. You're up to two incompleteness bugs on the changelog now :-)
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Related Issues (11)
- Fatal error on a big file HOT 2
- No proof when the conjecture is $true HOT 3
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