Lean Kernel Arena / official / corner-cases/eta-ctor

Checker: official · Version: v4.34.1 · 📄 Declaration · 🔗 Source

Test: corner-cases/eta-ctor · Expected: 🤷 either · Size: 9.0 KB · Lines: 148 · lean4export: 3.1.0 · Lean: 4.34.1 · 📄 Declaration · 🔗 Source

Result: ✋ rejected · exit code 1 · wall time: 32.7 ms · instructions: 172.9 M · max rss memory: 66.7 MB · run 2026-10-24 17:05:28 UTC

stderr:

uncaught exception: while replaying declaration 'etaCtor':
(kernel) declaration type mismatch, 'etaCtor' has type
  (x : True → T) → @Eq (True → T) x x
but it is expected to have type
  (x : True → T) → @Eq (True → T) (T.mk (T.val (x True.intro))) x