bevyengine/bevy · error

no `TypeInfo` found for argument: {:?}

Error message

no `TypeInfo` found for argument: {:?}

What it means

Panic in ArgListSignature::iter (signature computation for overload lookup): one of the arguments' values has no represented type (get_represented_type_info returned None), typically an untyped DynamicType value, so its Type cannot be determined. Ensure arguments carry represented type info.

Source

Thrown at crates/bevy_reflect/src/func/signature.rs:81

/// A wrapper around a borrowed [`ArgList`] that can be used as an
/// [equivalent] of an [`ArgumentSignature`].
///
/// [equivalent]: Equivalent
pub(super) struct ArgListSignature<'a, 'b>(&'a ArgList<'b>);

impl Equivalent<ArgumentSignature> for ArgListSignature<'_, '_> {
    fn equivalent(&self, key: &ArgumentSignature) -> bool {
        self.len() == key.len() && self.iter().eq(key.iter())
    }
}

impl<'a, 'b> ArgListSignature<'a, 'b> {
    pub fn iter(&self) -> impl ExactSizeIterator<Item = &Type> {
        self.0.iter().map(|arg| {
            arg.value()
                .get_represented_type_info()
                .unwrap_or_else(|| {
                    panic!("no `TypeInfo` found for argument: {:?}", arg);
                })
                .ty()
        })
    }

    pub fn len(&self) -> usize {
        self.0.len()
    }
}

impl Eq for ArgListSignature<'_, '_> {}

impl PartialEq for ArgListSignature<'_, '_> {
    fn eq(&self, other: &Self) -> bool {
        self.len() == other.len() && self.iter().eq(other.iter())
    }
}

View on GitHub (pinned to 396ca72708)

Solutions

1. Ensure every argument type implements Typed/Reflect so TypeInfo exists
2. Register the argument types in the type registry before calling

When it happens

Trigger: Thrown at crates/bevy_reflect/src/func/signature.rs:81 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/0913676d92533562. Report an issue: GitHub.