DioxusLabs/dioxus · error · syn::Error

Unsupported type path

Error message

Unsupported type path

What it means

Error "Unsupported type path" thrown in DioxusLabs/dioxus.

Source

Thrown at packages/manganis/manganis-macro/src/ffi.rs:107

                                ) = (iter.next(), iter.next())
                                {
                                    let ok_type = Self::from_type(ok_ty)?;
                                    let err_type = Self::from_type(err_ty)?;
                                    return Ok(ForeignType::Result(
                                        Box::new(ok_type),
                                        Box::new(err_type),
                                    ));
                                }
                            }
                            return Err(syn::Error::new(ty.span(), "Invalid Result type"));
                        }
                        _ => {
                            // Assume it's an opaque type reference
                            return Ok(ForeignType::OpaqueRef(segment.ident.clone()));
                        }
                    }
                }
                Err(syn::Error::new(ty.span(), "Unsupported type path"))
            }
            Type::Reference(type_ref) => {
                if let Type::Path(path) = &*type_ref.elem {
                    if path.path.is_ident("str") {
                        return Ok(ForeignType::StrRef);
                    }
                    // Check for &OpaqueType
                    if path.path.segments.len() == 1 {
                        return Ok(ForeignType::OpaqueRef(path.path.segments[0].ident.clone()));
                    }
                }
                Err(syn::Error::new(ty.span(), "Unsupported reference type"))
            }
            Type::Tuple(tuple) if tuple.elems.is_empty() => Ok(ForeignType::Unit),
            _ => Err(syn::Error::new(ty.span(), "Unsupported type")),
        }
    }

View on GitHub (pinned to 393d190a80)

When it happens

Trigger: Thrown at packages/manganis/manganis-macro/src/ffi.rs:107 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/c530148fb8dc38f5. Report an issue: GitHub.