emilk/egui · error

Invalid variation axis tag

Error message

Invalid variation axis tag

What it means

Error "Invalid variation axis tag" thrown in emilk/egui.

Source

Thrown at crates/epaint/src/text/text_layout_types.rs:410

impl IntoTag for [u8; 4] {
    #[inline(always)]
    fn into_tag(self) -> font_types::Tag {
        font_types::Tag::new_checked(&self).expect("Invalid variation axis tag")
    }
}

impl IntoTag for &[u8; 4] {
    #[inline(always)]
    fn into_tag(self) -> font_types::Tag {
        font_types::Tag::new_checked(self).expect("Invalid variation axis tag")
    }
}

impl IntoTag for &str {
    #[inline(always)]
    fn into_tag(self) -> font_types::Tag {
        font_types::Tag::from_str(self).expect("Invalid variation axis tag")
    }
}

/// List of font variation coordinates by axis tag. If more than one coordinate for a given axis is provided, the last
/// one added is used.
#[derive(Clone, Debug, PartialEq, Default)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct VariationCoords(SmallVec<[(font_types::Tag, f32); 2]>);

impl VariationCoords {
    /// Create a list of variation coordinates from a sequence of (tag, value) pairs.
    ///
    /// ## Example:
    /// ```
    /// use epaint::text::VariationCoords;
    ///
    /// let coords = VariationCoords::new([
    ///     (b"wght", 500.0),

View on GitHub (pinned to d802a982ce)

When it happens

Trigger: Thrown at crates/epaint/src/text/text_layout_types.rs:410 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emilk/egui@d802a982ce (2026-08-16). Data as JSON: /api/errors/3391f853ed7b99aa. Report an issue: GitHub.