Deep kernel reduction detected after `simp`

[tobiasgrosser]

Prerequisites

Please put an X between the brackets as you perform the following steps:

• [x] Check that your issue is not already filed: https://github.com/leanprover/lean4/issues
• [x] Reduce the issue to a minimal, self-contained, reproducible test case. Avoid dependencies to Mathlib or Batteries.
• [x] Test your test case against the latest nightly release, for example on https://live.lean-lang.org/#project=lean-nightly (You can also use the settings there to switch to “Lean nightly”)

Description

The following lean code leads to a deep kernel reduction detected error in Lean.

theorem minimal6 : ∀ (x : BitVec 32),
  ((some x).bind fun x =>
    (if False then none else some (x.sshiftRight 1)).bind fun x' =>
      some (x'.sshiftRight 1))
  = (some x) := by
  intro x
  simp only [Option.some_bind]
  sorry

Steps to Reproduce

1. Copy into lean
2. Observe the red line under the theorem name

Expected behavior: [Clear and concise description of what you expect to happen]

• simp should apply the lemma
• the proof should be marked as sorry with an orange line under the theorem name
• no kernel error

Versions

"4.12.0-nightly-2024-10-15"

Impact

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This issue was reduced by @lfrenot.