{"record":{"id":"1c133e1a8b39a79d","repo":"rust-lang/cargo","slug":"failed-to-parse-the-version-requirement-for-d","errorCode":null,"errorMessage":"failed to parse the version requirement `{}` for dependency `{}`","messagePattern":"failed to parse the version requirement `(.+?)` for dependency `(.+?)`","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"src/workspace/dependency.rs","lineNumber":129,"sourceCode":"            DepKind::Build => Some(\"build\"),\n        }\n        .serialize(s)\n    }\n}\n\nimpl Dependency {\n    /// Attempt to create a `Dependency` from an entry in the manifest.\n    pub fn parse(\n        name: impl Into<InternedString>,\n        version: Option<&str>,\n        source_id: SourceId,\n    ) -> CargoResult<Dependency> {\n        let name = name.into();\n        let (specified_req, version_req) = match version {\n            Some(v) => match VersionReq::parse(v) {\n                Ok(req) => (true, OptVersionReq::Req(req)),\n                Err(err) => {\n                    return Err(anyhow::Error::new(err).context(format!(\n                        \"failed to parse the version requirement `{}` for dependency `{}`\",\n                        v, name,\n                    )));\n                }\n            },\n            None => (false, OptVersionReq::Any),\n        };\n\n        let mut ret = Dependency::new_override(name, source_id);\n        {\n            let ptr = Arc::make_mut(&mut ret.inner);\n            ptr.only_match_name = false;\n            ptr.req = version_req;\n            ptr.specified_req = specified_req;\n        }\n        Ok(ret)\n    }\n","sourceCodeStart":111,"sourceCodeEnd":147,"githubUrl":"https://github.com/rust-lang/cargo/blob/98a09e7e7d62850f14e5b6132101fc1edd19a16f/src/workspace/dependency.rs#L111-L147","documentation":"`Dependency::parse` constructs a `Dependency` from a manifest entry: a name, an optional version string, and a `SourceId`. When `version` is `Some(v)`, it calls `SemVer::VersionReq::parse(v)`; on failure it wraps the parse error with `.context(...)` interpolating both the raw version requirement string and the dependency name. This surfaces malformed version requirements (e.g. invalid operators, bad comparator syntax) with full context about which dependency failed.","triggerScenarios":"Declaring a dependency with an unparseable version requirement in `Cargo.toml`, e.g. `serde = { version = \"^=>1.0\" }` or `req = \"1.0.0-alpha..\"`. `VersionReq::parse` returns `Err`, triggering the context-wrapped error.","commonSituations":"Typos in version specifiers, mixing npm/cargo version syntax, trailing operators, incomplete ranges, copy-pasting a version from another ecosystem, or using prerelease/metadata syntax that SemVer rejects.","solutions":["Correct the version requirement to valid Cargo/SemVer syntax (e.g. `\"1\"`, `\"1.2\"`, `\"=1.2.3\"`, `\"^1.2\"`, `\">=1.0, <2.0\"`).","Refer to the Cargo SemVer requirement grammar and rewrite the specifier accordingly.","Remove the version key entirely if any version is acceptable (Cargo treats omission as `*`)."],"exampleFix":"# before\n[dependencies]\nserde = { version = \"^=>1.0.0\" }\n\n# after\n[dependencies]\nserde = { version = \"1.0.0\" }","handlingStrategy":"validation","validationCode":"use semver::VersionReq;\nfn valid_version_req(v: &str) -> bool { VersionReq::parse(v).is_ok() }\n// validate dependency version strings before writing them into Cargo.toml\nassert!(valid_version_req(\"1.0.0\"));","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Validate version requirements with `semver::VersionReq::parse` before committing manifests.","Run `cargo check`/`cargo metadata` in CI to catch manifest parse errors.","Keep a reference of Cargo SemVer syntax and avoid cross-ecosystem specifiers."],"tags":["manifest","semver","dependency","version-requirement","cargo"],"backgroundTag":null,"analyzedSha":"98a09e7e7d62850f14e5b6132101fc1edd19a16f","analyzedAt":"2026-08-11T17:42:36.556Z","contentChangedAt":"2026-08-11T17:42:36.556Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}