DioxusLabs/dioxus · error

slot path overflow

Error message

slot path overflow

What it means

TemplateSlotPath encodes a node path into a fixed bit budget (TEMPLATE_SLOT_PATH_MAX_PATH_BITS). If a template path's bit payload exceeds MAX_PAYLOAD, it cannot be represented, so this panic fires during const encoding in the core-template macro.

Source

Thrown at packages/core-template/src/path.rs:223

        self.is_last_static_node
    }
}

impl TemplateSlotPath {
    const TARGET_LAST_STATIC_NODE: u128 = 1;
    const MAX_PAYLOAD: u128 = u128::MAX >> (u128::BITS as usize - TEMPLATE_SLOT_PATH_MAX_PATH_BITS);

    const fn new(bits: u128) -> Self {
        match NonZeroU128::new(bits) {
            Some(bits) => Self(bits),
            None => panic!("bad slot path"),
        }
    }

    const fn encode_payload(path: TemplatePath) -> u128 {
        let payload = path.bits();
        if payload > Self::MAX_PAYLOAD {
            panic!("slot path overflow");
        }
        payload << 1
    }

    pub(crate) const fn static_node(path: TemplatePath) -> Self {
        if path.is_empty() {
            panic!("bad slot target");
        }
        Self::new(Self::encode_payload(path))
    }

    pub(crate) const fn last_static_node(path: TemplatePath) -> Self {
        Self::new(Self::encode_payload(path) | Self::TARGET_LAST_STATIC_NODE)
    }

    /// Return the raw tagged bits.
    pub(crate) const fn bits(self) -> u128 {
        self.0.get()

View on GitHub (pinned to 24f6a829df)

Solutions

1. The template slot path is too deep for the packed representation. Reduce nesting by splitting the component into smaller components.

When it happens

Trigger: Thrown at packages/core-template/src/path.rs:223 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/ac648f8219bb5d20. Report an issue: GitHub.