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Rollup merge of #146753 - tiif:unsatisfiable-unstable-feature, r=BoxyUwU
Improve the pretty print of UnstableFeature clause
As per https://github.com/rust-lang/rust/pull/145095#discussion_r2349439492, we could make the diagnostic for unsatisfiable ``UnstableFeature`` clause better.
r? `@BoxyUwU`