Idea: #[must_use = inherit]

It does work, but still has two downsides:

• Verbose. I should put #[expect(clippy::double_must_use)] on every function that returns a Result<T, E>(for example). In addition, if you turned on allow_attributes_without_reason(I did!), now it becomes #[expect(clippy::double_must_use, reason = "...")]. That will be nightmare IMO.
• Doubled warning, what double_must_use is concerned about.