Rollup merge of #137251 - Zalathar:holes-visitor, r=jieyouxu

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coverage: Get hole spans from nested items without fully visiting them

This is a small simplification to the code that collects the spans of nested items within a function, so that those spans can be treated as “holes” to be avoided by the current function's coverage mappings.

The old code was using `nested_filter::All` to ensure that the visitor would see nested items. But we don't need the actual items themselves; we just need their spans, which we can obtain via a custom implementation of `visit_nested_item`.

This avoids the more expansive queries required by `nested_filter::All`.

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Matthias Krüger 2025-02-19 18:52:10 +01:00 committed by GitHub

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