{"adoption": {"forks": 373, "observed_at": "2026-08-28T04:08:03.695233+00:00", "stars": 3415}, "canonical_url": "https://ross.abutalabs.com/products/syn", "card": {"archived": false, "artifact_type": "library", "description": "Parser for Rust source code", "domain": ["parsers", "programming-languages", "developer-tools"], "enriched": true, "function": ["parser", "compiler", "developer-tools"], "health_score": 100, "homepage": null, "language": "Rust", "license": "Apache-2.0", "license_family": "permissive", "maturity": "stable", "member_repos": ["dtolnay/syn"], "name": "dtolnay/syn", "platform": ["rust", "cross-platform"], "pushed_at": "2026-08-26T03:15:20+00:00", "repo": "dtolnay/syn", "stars": 3415, "tags": ["proc-macro", "syntax-tree", "rust", "token-parsing", "derive-macros"], "topics": ["proc-macro"], "urls": [], "use_cases": ["parse rust source code into a syntax tree", "write a rust procedural macro", "build a custom derive macro", "generate compiler-style error messages with token spans", "parse custom DSL syntax in rust"], "what_it_is": "Syn is a Rust parsing library that converts a stream of Rust tokens into a syntax tree of Rust source code. It is primarily designed for use in Rust procedural macros, providing syntax tree data structures, parsing APIs, and span-based error reporting.", "when_to_avoid": ["you need to parse languages other than Rust", "you only need lightweight token manipulation without a syntax tree", "you want to format or pretty-print Rust code rather than parse it"], "when_to_choose": ["you are building Rust procedural macros (derive, attribute, or function-like)", "you need a full syntax tree representation of Rust code", "you want precise span information for error reporting in macros", "you need to parse custom token-stream syntaxes in Rust"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/syn", "repo": "dtolnay/syn", "role": "main", "score": 99}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:08:03.695233+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-29T18:38:28.397299+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "1af19e64eeab55831649814d033f8564c5e8c64af5b19b353af8140d9a189e6e", "fetched_at": "2026-08-28T04:08:03.695233+00:00", "kind": "readme", "missing": false, "url": "https://github.com/dtolnay/syn"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 99, "longevity": 100, "rhythm": 99}, "computed_at": "2026-09-03T02:20:16.233290+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 3651, "days_push": 7, "days_rel": 10, "gap_med": 4.0, "n_releases_24m": 47}, "score": 99, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}