DioxusLabs/dioxus · error · syn::Error

keyword argument repeated: `output`

Error message

keyword argument repeated: `output`

What it means

Error "keyword argument repeated: `output`" thrown in DioxusLabs/dioxus.

Source

Thrown at packages/fullstack-macro/src/lib.rs:1618

                        }
                        input = Some(stream.parse()?);
                    } else if key == "input_derive" {
                        if input_derive.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `input_derive`",
                            ));
                        }
                        input_derive = Some(stream.parse()?);
                    } else if key == "output" {
                        if encoding.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "`encoding` and `output` should not both be \
                                 specified",
                            ));
                        } else if output.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `output`",
                            ));
                        }
                        output = Some(stream.parse()?);
                    } else if key == "server" {
                        if server.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `server`",
                            ));
                        }
                        server = Some(stream.parse()?);
                    } else if key == "client" {
                        if client.is_some() {
                            return Err(syn::Error::new(
                                key.span(),
                                "keyword argument repeated: `client`",

View on GitHub (pinned to 393d190a80)

When it happens

Trigger: Thrown at packages/fullstack-macro/src/lib.rs:1618 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@393d190a80 (2026-08-16). Data as JSON: /api/errors/c449f724fc64c188. Report an issue: GitHub.