{"record":{"id":"21bcd53079c86aaa","repo":"GitoxideLabs/gitoxide","slug":"this-impl-is-needed-to-allow-passing-a-known-valid","errorCode":null,"errorMessage":"this impl is needed to allow passing a known valid partial path as parameter","messagePattern":"this impl is needed to allow passing a known valid partial path as parameter","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"info","filePath":"gix-ref/src/store/file/find.rs","lineNumber":464,"sourceCode":"    pub enum Error {\n        #[error(\"The ref name or path is not a valid ref name\")]\n        RefnameValidation(#[from] crate::name::Error),\n        #[error(\"The ref file {path:?} could not be read in full\")]\n        ReadFileContents { source: io::Error, path: PathBuf },\n        #[error(\"The reference at \\\"{relative_path}\\\" could not be instantiated\")]\n        ReferenceCreation {\n            source: file::loose::reference::decode::Error,\n            relative_path: PathBuf,\n        },\n        #[error(\"A packed ref lookup failed\")]\n        PackedRef(#[from] packed::find::Error),\n        #[error(\"Could not open the packed refs buffer when trying to find references.\")]\n        PackedOpen(#[from] packed::buffer::open::Error),\n    }\n\n    impl From<Infallible> for Error {\n        fn from(_: Infallible) -> Self {\n            unreachable!(\"this impl is needed to allow passing a known valid partial path as parameter\")\n        }\n    }\n}\n","sourceCodeStart":446,"sourceCodeEnd":468,"githubUrl":"https://github.com/GitoxideLabs/gitoxide/blob/e73179060badf27222d790981fac3f84c1830a7e/gix-ref/src/store/file/find.rs#L446-L468","documentation":"An `unreachable!()` panic in gix-ref's file store `find` module: a `From<Infallible> for Error` implementation. The impl exists only to satisfy type conversions when a known-valid partial path is passed to fallible internals; since `Infallible` can never be constructed, the panic body is unreachable by construction and fires only if the compiler/derive machinery somehow routes a value through it (i.e. a type-level bug, not a runtime condition).","triggerScenarios":"Not triggerable by callers: the error type `Infallible` has no values. It could only fire if Rust's `!`/`Infallible` guarantees were violated, e.g. via unsafe transmutation or a macro-generated code path that fabricated the value.","commonSituations":"Developers encounter this line while reading gix-ref source or while refactoring the `find` error type; users never see the panic in practice.","solutions":["No action needed for users — the panic is a compile-time-adjacent placeholder for an impossible conversion","If it somehow fires, treat it as a Rust soundness bug: isolate the reproduction and file an issue upstream","When refactoring gix-ref, keep the impl's `unreachable!` message intact so any violation is diagnosable"],"exampleFix":null,"handlingStrategy":"type-guard","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":["No user action required: Infallible is unconstructible, so this panic cannot fire","Do not remove the From<Infallible> impl when refactoring gix-ref — callers rely on it","If it ever fires, suspect unsafe code or a Rust compiler bug and report upstream"],"tags":["rust","panic","refs","type-system","infallible"],"backgroundTag":"internal-invariant-violation","analyzedSha":"e73179060badf27222d790981fac3f84c1830a7e","analyzedAt":"2026-09-08T11:26:50.865Z","contentChangedAt":"2026-09-08T11:26:50.865Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}