bevyengine/bevy · error

{}

Error message

{}

What it means

Panic in DynamicFunctionMut::with_overload: the infallible wrapper discards the error value and panics with its Display output when try_with_overload fails — typically because a signature was missing, duplicated, or exceeded the max argument count. Use try_with_overload to handle the failure instead.

Source

Thrown at crates/bevy_reflect/src/func/dynamic_function_mut.rs:181

    /// func.call(args).unwrap();
    ///
    /// drop(func);
    /// assert_eq!(total_i32, 123);
    /// assert_eq!(total_f32, 1.23);
    /// ```
    ///
    /// [argument signature]: crate::func::signature::ArgumentSignature
    /// [name]: Self::name
    /// [`try_with_overload`]: Self::try_with_overload
    pub fn with_overload<'a, F: IntoFunctionMut<'a, Marker>, Marker>(
        self,
        function: F,
    ) -> DynamicFunctionMut<'a>
    where
        'env: 'a,
    {
        self.try_with_overload(function).unwrap_or_else(|(_, err)| {
            panic!("{}", err);
        })
    }

    /// Attempt to add an overload to this function.
    ///
    /// If the function, `F`, contains a signature already found in this function,
    /// an error will be returned along with the original function.
    ///
    /// For a panicking version, see [`with_overload`].
    ///
    /// [`with_overload`]: Self::with_overload
    pub fn try_with_overload<F: IntoFunctionMut<'env, Marker>, Marker>(
        mut self,
        function: F,
    ) -> Result<Self, (Box<Self>, FunctionOverloadError)> {
        let function = function.into_function_mut();

        match self.internal.merge(function.internal) {

View on GitHub (pinned to 396ca72708)

Solutions

1. Use try_with_overload and handle the FunctionOverloadError
2. Ensure the overload has a unique argument signature

When it happens

Trigger: Thrown at crates/bevy_reflect/src/func/dynamic_function_mut.rs:181 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bevyengine/bevy@396ca72708 (2026-08-20). Data as JSON: /api/errors/d442cb29ecdda9a7. Report an issue: GitHub.