`set_option in` makes local attribute ineffective

[JLimperg]

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 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

Add :+1: to issues you consider important. If others are impacted by this issue, please ask them to add :+1: to it.