tauri-apps/tauri · error

path has at least one segment

Error message

path has at least one segment

What it means

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.

Solutions

1. Upgrade tauri-macros/tauri to the latest patched version
2. Check the attribute used (e.g. rename_command / macro path) for typos or empty values
3. File an issue with the minimal reproducing attribute if it persists

Example fix

// before
tauri::command(rename_with = "")
fn cmd() {}
// after
tauri::command(rename_with = my_path::command_name)
fn cmd() {}

fn path_has_segments(p: &syn::Path) -> bool { !p.segments.is_empty() }

// compile-time panic; catch by pinning and upgrading the macro crate
// Cargo.toml
tauri-macros = "= <known-good-version>"  // pin, then upgrade to latest fix

When it happens

Trigger: 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.

Common situations: 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.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

• parsed syn::Path has no segment
• expected "camelCase" or "snake_case"
• expected string literal for rename
• only named, wildcard, struct, and tuple struct arguments…
• unable to use self as a command function parameter

AI-assisted analysis of tauri-apps/tauri@460ec35447 (2026-09-18). Data as JSON: /api/errors/cf305e97735e6b8d. Report an issue: GitHub.

Appendix: source

Thrown at crates/tauri-macros/src/command/handler.rs:165

      command_defs,
      commands,
      wrappers,
    }: Handler,
  ) -> Self {
    let cmd = format_ident!("__tauri_cmd__");
    let invoke = format_ident!("__tauri_invoke__");
    let mut paths: Vec<Path> = Vec::new();
    let mut attrs: Vec<Vec<Attribute>> = Vec::new();
    let mut command_name_macros: Vec<proc_macro2::TokenStream> = Vec::new();
    for (def, command) in command_defs.into_iter().zip(commands) {
      let path = def.path;
      let attrs_vec = def.attrs;

      let mut command_name_macro_path = path.clone();
      let last = command_name_macro_path
        .segments
        .last_mut()
        .expect("path has at least one segment");
      last.ident = format_ident!("__tauri_command_name_{command}");

      paths.push(path);
      attrs.push(attrs_vec);
      // Call the macro to get the command name string literal
      command_name_macros.push(quote!(#command_name_macro_path!()));
    }

    quote::quote!(move |#invoke| {
      let #cmd = #invoke.message.command();
      match #cmd {
        #(#(#attrs)* #command_name_macros => #wrappers!(#paths, #invoke),)*
        _ => {
          return false;
        },
      }
    })
    .into()

View on GitHub (pinned to 460ec35447)