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privacy: document unordered visibility limit#155792

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SynapLink wants to merge 1 commit intorust-lang:mainfrom
SynapLink:document-unordered-effective-vis
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privacy: document unordered visibility limit#155792
SynapLink wants to merge 1 commit intorust-lang:mainfrom
SynapLink:document-unordered-effective-vis

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Follow-up to #155257.\n\nWhile investigating the FIXME in EffectiveVisibilities::update, the unordered case comes from restricted visibilities forming a tree: restrictions to sibling modules are incomparable. This documents the current behavior for the nominal visibility limit case, where the inherited effective visibility is preserved because there is no single Visibility that can represent the intersection.\n\nNo behavior change.

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 25, 2026
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rustbot commented Apr 25, 2026

r? @nikomatsakis

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