Tracking Issue for de-stabilizing (and eventually removing?) the old serialization infrastructure (feature gate: rustc_encodable_decodable) #134301
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Description
This tracks the progress on rust-lang/libs-team#272. That issue says that #105572 will cause rustc-serialize to stop building; it seems like a semver-compatible update was released to avoid that, so currently that crate can still be used on stable. Since Rust 1.79, the future compatibility report shows this as a warning (even for dependencies).
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