`set_option in` makes local attribute ineffective

Prerequisites

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• Check that your issue is not already filed:
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• Reduce the issue to a minimal, self-contained, reproducible test case.
  Avoid dependencies to Mathlib or Batteries.
• Test your test case against the latest nightly release, for example on
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Description

The construction

set_option ... in
attribute [local ...] ...

silently fails to add the attribute. I believe this is because the set_option in is desugared into a section and the attribute becomes local to that section, which is then immediately closed again.

Steps to Reproduce

MWE:

axiom falso : False

section Works

attribute [local simp] falso

example : False := by simp

end Works

section Fails

set_option trace.debug true in
attribute [local simp] falso

example : False := by simp -- simp made no progress

end Fails

Versions

"4.11.0-nightly-2024-07-12"

Impact

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Start with the minimal reproducer in the issue and inspect how set_option ... in handles the following local attribute declaration, especially its interaction with section scope. Done means the attribute [local simp] falso remains effective for the subsequent example while option scoping still works.