DioxusLabs/dioxus · error

keyword argument repeated: `protocol`

Error message

keyword argument repeated: `protocol`

What it means

Parse guard in the server-macro attribute parser: the keyword argument `protocol` was passed more than once in the macro attribute's argument stream, and the parser rejects assigning any keyword twice. The input at fault is the duplicated `protocol = ...` argument, with the error spanned at the repeated key.

Solutions

1. Remove the duplicate `protocol` keyword argument; each keyword may only be specified once.

When it happens

Trigger: Thrown at packages/fullstack-macro/src/lib.rs:1666 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@24f6a829df (2026-08-23). Data as JSON: /api/errors/7fe9e4d385fdc3ff. Report an issue: GitHub.

Appendix: source

Thrown at packages/fullstack-macro/src/lib.rs:1666

                    } else if key == "impl_from" {
                        if impl_from.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `impl_from`",
                            ));
                        }
                        impl_from = Some(stream.parse()?);
                    } else if key == "impl_deref" {
                        if impl_deref.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `impl_deref`",
                            ));
                        }
                        impl_deref = Some(stream.parse()?);
                    } else if key == "protocol" {
                        if protocol.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `protocol`",
                            ));
                        }
                        protocol = Some(stream.parse()?);
                    } else {
                        return Err(lookahead.error());
                    }
                } else {
                    let value = key_or_value;
                    if use_key_and_value {
                        return Err(syn::Error::new(
                            value.span(),
                            "positional argument follows keyword argument",
                        ));
                    }
                    if arg_pos == 1 {
                        struct_name = Some(value)

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