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Summary

• Mark syn-ext deprecated in the README, crate documentation, and package description.
• Explain that LLM-assisted direct use of syn makes this shortcut abstraction no longer worth maintaining, and recommend direct syn APIs or project-local helpers.
• Prepare version 0.5.1+deprecated for a deprecation release.
• Keep the API and dependencies unchanged; do not add compiler deprecation warnings.

Version semantics

+deprecated is informational SemVer build metadata, not a prerelease or a compiler-warning mechanism. Cargo ignores it for dependency version matching, so it has the same precedence and compatibility as 0.5.1. Registry versions must be unique when build metadata is ignored: 0.5.1 and 0.5.1+deprecated cannot be published as separate releases. The current syn-ext registry index has no 0.5.1-equivalent version.

References: Cargo manifest version, dependency version metadata, registry version uniqueness, syn-ext registry index.

Validation

• cargo fmt --all -- --check
• cargo metadata --offline --no-deps --format-version 1
• cargo package --list --allow-dirty --offline
• cargo package --offline --no-verify after committing the version bump
• git diff --check
• Inspected the generated .crate: version preserved in both manifests and the generated lockfile, deprecation notices included, and clean VCS commit matches the release-preparation commit.

This prepares the release package but does not publish or yank anything. Compilation and the full test suite were not run locally; the package command above explicitly skips build verification.

Prepared with AI assistance from OpenAI dot.

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