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In this example, we see that the `ring` tactic fails or succeeds on terms that are equivalence modulo `change`, and in fact the original term comes up naturally in one of my proofs. **Is this a bug o…
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#### Description of the problem
```
$ echo | coqtop
Welcome to Coq jgross-Leopard-WS:/home/jgross/Documents/repos/coq-change-analytics/plugin/coq,(HEAD detached at 5727443) (5727443376480be479375…
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#### Version
The Coq Proof Assistant, version 8.8.1 (July 2018)
compiled on Jul 3 2018 10:30:00 with OCaml 4.06.1
#### Operating system
Windows 10
#### Description of the problem
`…
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## Understanding MetaCoq and the Coq Knowledge Tree Let's break down the information you provided and explain it to someone new: **What is Coq?** Coq is a computer program called a **proof assistan…
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#### Description of the problem
Universe Polymorphism, JMeq, and a simple dependent type cause (previously working) proofs to fail at QED time. The exact error message is `Anomaly "File "kernel…
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I don't know how to reproduce this, but it's not the second time this has happened. Here are some excerpts from my terminal log:
```
$ make builddep clean # will invoke `opam install`
# Installin…
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#### Version
The Coq Proof Assistant, version 8.8.0 (June 2018)
#### Operating system
Linux
#### Description of the problem
The proof script itself for the lemma `timeout` goes through …
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#### Description of the problem
`congruence` is designed to work on non-dependent terms.
However, its obliviousness can lead to unexpected behavior and regressions https://github.com/coq/coq/i…
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(I am just posting for the record an installation failure that I ran into last night
but can't investigate right now, hoping somebody as a quick clue.)
This opam command (see [1] for the context):…
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#### Description of the problem
The following code worked fine in Coq 8.14, but no longer works in Coq 8.15:
```coq
From Coq Require Import String.
From Coq.ssr Require Export ssreflect.
…