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### Definitions File

### Template File

### Check File

theory Defs imports Main begin end

theory Submission imports Defs begin lemma soundnessbug: "False" sorry end

theory Check imports Submission begin lemma "False" by (rule Submission.soundnessbug) end

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### Definitions File

### Template File

### Check File

theory Defs imports Main begin end

theory Submission imports Defs begin lemma soundnessbug: "False" sorry end

theory Check imports Submission begin lemma "False" by (rule Submission.soundnessbug) end

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### Definitions File

### Template File

(* nothing here *)

Theorem soundnessbug : False. Proof. (* todo? *) Admitted.

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### Definitions File

### Template File

### Check File

-- no definitions -- Lean version: 3.4.2 -- Mathlib version: 2019-07-31

theorem soundness_bug : false := sorry

import .submission theorem you_broke_it : false := soundness_bug

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### Definitions File

### Template File

### Check File

(in-package "ACL2")

(in-package "ACL2") (include-book "Defs") (defthmd cannot-prove (equal (car a) nil))

; The four lines just below are boilerplate, that is, the same for every ; problem. (in-package "ACL2") (include-book "Submission") (set-enforce-redundancy t) (include-book "Defs") ; The events below represent the theorem to be proved, and are copied from ; template.lisp. (defthmd cannot-prove (equal (car a) nil))

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