typst/typst · error

cannot expand into infinite height

Error message

cannot expand into infinite height

What it means

Raised in layout_fragment_impl when the region's available height is infinite while expansion along y is requested. The content is being laid out in a vertically unbounded context (e.g. inside a block with auto height in an infinite region) but asks to expand to the full height, which would require a frame of infinite size.

Source

Thrown at crates/typst-layout/src/flow/mod.rs:136

#[expect(clippy::too_many_arguments)]
fn layout_fragment_impl(
    world: Tracked<dyn World + '_>,
    library: &LazyHash<Library>,
    introspector: Tracked<dyn Introspector + '_>,
    traced: Tracked<Traced>,
    sink: TrackedMut<Sink>,
    route: Tracked<Route>,
    content: &Content,
    locator: Tracked<Locator>,
    styles: StyleChain,
    regions: Regions,
    column: ColumnOptions,
) -> SourceResult<Fragment> {
    if !regions.size.x.is_finite() && regions.expand.x {
        bail!(content.span(), "cannot expand into infinite width");
    }
    if !regions.size.y.is_finite() && regions.expand.y {
        bail!(content.span(), "cannot expand into infinite height");
    }

    let introspector = Protected::from_raw(introspector);
    let link = LocatorLink::new(locator);
    let mut locator = Locator::link(&link).split();
    let mut engine = Engine {
        library,
        world,
        introspector,
        traced,
        sink,
        route: Route::extend(route),
    };

    engine.route.check_layout_depth().at(content.span())?;

    let mut kind = FragmentKind::Block;
    let arenas = Arenas::default();

View on GitHub (pinned to 6a6f1a97a3)

Solutions

1. Give the enclosing container a finite height
2. Avoid expandable height in vertically unbounded contexts such as nested auto-height blocks
3. Move the content to a context with a defined height (e.g. the page body)

When it happens

Trigger: Thrown at crates/typst-layout/src/flow/mod.rs:133 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of typst/typst@6a6f1a97a3 (2026-08-17). Data as JSON: /api/errors/9128dbf571c89509. Report an issue: GitHub.