Can't add local attribute for namespaced theorem

[JLimperg]

Prerequisites

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Description

The construction

@[local ...]
theorem Foo.bar ...

seemingly makes the attribute local to the Foo namespace, which is immediately closed again. Hence the attribute is effectively not applied.

Steps to Reproduce

MWE:

-- Fails

@[local simp]
axiom Foo.falso : False

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

-- Works

@[local simp]
axiom falso : False

example : False := by simp

I don't see a situation in which this behaviour would be useful, so the first example should imo either make the attribute local to the current section/namespace or throw an error at @[local simp]. There is probably a similar issue with scoped attributes; there the desired behaviour is less clear.

Versions

"4.11.0-nightly-2024-07-12"

Impact

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[JLimperg]

Btw, this also leads to what might be considered an inconsistency with attribute:

-- Works

axiom Foo.falso : False

attribute [local simp] Foo.falso

example : False := by simp