{"record":{"id":"cf305e97735e6b8d","repo":"tauri-apps/tauri","slug":"path-has-at-least-one-segment","errorCode":null,"errorMessage":"path has at least one segment","messagePattern":"path has at least one segment","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/tauri-macros/src/command/handler.rs","lineNumber":165,"sourceCode":"      command_defs,\n      commands,\n      wrappers,\n    }: Handler,\n  ) -> Self {\n    let cmd = format_ident!(\"__tauri_cmd__\");\n    let invoke = format_ident!(\"__tauri_invoke__\");\n    let mut paths: Vec<Path> = Vec::new();\n    let mut attrs: Vec<Vec<Attribute>> = Vec::new();\n    let mut command_name_macros: Vec<proc_macro2::TokenStream> = Vec::new();\n    for (def, command) in command_defs.into_iter().zip(commands) {\n      let path = def.path;\n      let attrs_vec = def.attrs;\n\n      let mut command_name_macro_path = path.clone();\n      let last = command_name_macro_path\n        .segments\n        .last_mut()\n        .expect(\"path has at least one segment\");\n      last.ident = format_ident!(\"__tauri_command_name_{command}\");\n\n      paths.push(path);\n      attrs.push(attrs_vec);\n      // Call the macro to get the command name string literal\n      command_name_macros.push(quote!(#command_name_macro_path!()));\n    }\n\n    quote::quote!(move |#invoke| {\n      let #cmd = #invoke.message.command();\n      match #cmd {\n        #(#(#attrs)* #command_name_macros => #wrappers!(#paths, #invoke),)*\n        _ => {\n          return false;\n        },\n      }\n    })\n    .into()","sourceCodeStart":147,"sourceCodeEnd":183,"githubUrl":"https://github.com/tauri-apps/tauri/blob/460ec35447493200d64290dd7f015d5a91d0fd58/crates/tauri-macros/src/command/handler.rs#L147-L183","documentation":"In the tauri-macros command handler expansion, the code clones the macro path and mutates its last segment; .expect panics when the parsed syn::Path has zero segments. This is an internal invariant of the macro: a command name path like SomeMacro! should always contain at least one segment.","triggerScenarios":"Using #[tauri::command] with a macro_path/reference attribute whose parsed token stream yields an empty path — typically only reachable via a proc-macro bug or hand-crafted/synthetic attribute input.","commonSituations":"Practically only encountered by tauri maintainers or by macro-generated code feeding malformed paths into the command macro; users hit it as an unexpected compile-time panic in tauri-macros.","solutions":["Upgrade tauri-macros/tauri to the latest patched version","Check the attribute used (e.g. rename_command / macro path) for typos or empty values","File an issue with the minimal reproducing attribute if it persists"],"exampleFix":"// before\ntauri::command(rename_with = \"\")\nfn cmd() {}\n// after\ntauri::command(rename_with = my_path::command_name)\nfn cmd() {}","handlingStrategy":"fallback","validationCode":null,"typeGuard":"fn path_has_segments(p: &syn::Path) -> bool { !p.segments.is_empty() }","tryCatchPattern":"// compile-time panic; catch by pinning and upgrading the macro crate\n// Cargo.toml\ntauri-macros = \"= <known-good-version>\"  // pin, then upgrade to latest fix","preventionTips":["Keep tauri-macros and tauri versions in lockstep","Avoid hand-crafted attribute token streams fed to #[tauri::command]","Report minimal repros of macro panics upstream"],"tags":["proc-macro","compile-time","tauri","invariant"],"backgroundTag":"internal-invariant-violation","analyzedSha":"460ec35447493200d64290dd7f015d5a91d0fd58","analyzedAt":"2026-09-18T23:55:51.277Z","contentChangedAt":"2026-09-18T23:55:51.277Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}