diff --git a/src/eval/node.rs b/src/eval/node.rs
index 43cb906b7..ffa1eee6c 100644
--- a/src/eval/node.rs
+++ b/src/eval/node.rs
@@ -372,13 +372,13 @@ impl Packer {
             return;
         }
 
-        if !self.par.styles.compatible(&styles, ParNode::has_property) {
+        if !self.par.styles.compatible(styles, ParNode::has_property) {
             self.parbreak(None);
             self.par.styles = styles.clone();
             return;
         }
 
-        self.par.styles.intersect(&styles);
+        self.par.styles.intersect(styles);
     }
 
     /// Break to a new page if the `styles` contain page styles that are
@@ -389,7 +389,7 @@ impl Packer {
             return;
         }
 
-        if self.top && !self.flow.styles.compatible(&styles, PageNode::has_property) {
+        if self.top && !self.flow.styles.compatible(styles, PageNode::has_property) {
             self.pagebreak();
             self.flow.styles = styles.clone();
             return;
diff --git a/src/export/pdf.rs b/src/export/pdf.rs
index b5f4c009e..f0fd10f66 100644
--- a/src/export/pdf.rs
+++ b/src/export/pdf.rs
@@ -390,7 +390,7 @@ impl<'a> PageExporter<'a> {
         // Make the coordinate system start at the top-left.
         self.bottom = frame.size.y.to_f32();
         self.content.transform([1.0, 0.0, 0.0, -1.0, 0.0, self.bottom]);
-        self.write_frame(&frame);
+        self.write_frame(frame);
         Page {
             size: frame.size,
             content: self.content,
diff --git a/src/export/subset.rs b/src/export/subset.rs
index b58e042e3..68d455020 100644
--- a/src/export/subset.rs
+++ b/src/export/subset.rs
@@ -656,7 +656,7 @@ mod cff {
 
             if count > 0 {
                 let offsize = usize::from(s.read::<u8>()?);
-                if offsize < 1 || offsize > 4 {
+                if !matches!(offsize, 1 ..= 4) {
                     return None;
                 }
 
diff --git a/src/geom/paint.rs b/src/geom/paint.rs
index 66bfb17c0..0eba9f2f5 100644
--- a/src/geom/paint.rs
+++ b/src/geom/paint.rs
@@ -72,7 +72,7 @@ impl RgbaColor {
 }
 
 impl FromStr for RgbaColor {
-    type Err = ParseRgbaError;
+    type Err = RgbaError;
 
     /// Constructs a new color from hex strings like the following:
     /// - `#aef` (shorthand, with leading hashtag),
@@ -83,7 +83,7 @@ impl FromStr for RgbaColor {
     fn from_str(hex_str: &str) -> Result<Self, Self::Err> {
         let hex_str = hex_str.strip_prefix('#').unwrap_or(hex_str);
         if !hex_str.is_ascii() {
-            return Err(ParseRgbaError);
+            return Err(RgbaError);
         }
 
         let len = hex_str.len();
@@ -92,7 +92,7 @@ impl FromStr for RgbaColor {
         let alpha = len == 4 || len == 8;
 
         if !long && !short {
-            return Err(ParseRgbaError);
+            return Err(RgbaError);
         }
 
         let mut values: [u8; 4] = [255; 4];
@@ -102,7 +102,7 @@ impl FromStr for RgbaColor {
             let pos = elem * item_len;
 
             let item = &hex_str[pos .. (pos + item_len)];
-            values[elem] = u8::from_str_radix(item, 16).map_err(|_| ParseRgbaError)?;
+            values[elem] = u8::from_str_radix(item, 16).map_err(|_| RgbaError)?;
 
             if short {
                 // Duplicate number for shorthand notation, i.e. `a` -> `aa`
@@ -134,15 +134,15 @@ impl Debug for RgbaColor {
 
 /// The error when parsing an [`RgbaColor`] from a string fails.
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
-pub struct ParseRgbaError;
+pub struct RgbaError;
 
-impl Display for ParseRgbaError {
+impl Display for RgbaError {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.pad("invalid color")
+        f.pad("invalid hex string")
     }
 }
 
-impl std::error::Error for ParseRgbaError {}
+impl std::error::Error for RgbaError {}
 
 #[cfg(test)]
 mod tests {
@@ -166,7 +166,7 @@ mod tests {
     fn test_parse_invalid_colors() {
         #[track_caller]
         fn test(hex: &str) {
-            assert_eq!(RgbaColor::from_str(hex), Err(ParseRgbaError));
+            assert_eq!(RgbaColor::from_str(hex), Err(RgbaError));
         }
 
         test("12345");
diff --git a/src/geom/scalar.rs b/src/geom/scalar.rs
index 066246a9c..948ea7ecd 100644
--- a/src/geom/scalar.rs
+++ b/src/geom/scalar.rs
@@ -27,7 +27,7 @@ impl Debug for Scalar {
 
 impl Ord for Scalar {
     fn cmp(&self, other: &Self) -> Ordering {
-        self.partial_cmp(&other).expect("float is NaN")
+        self.partial_cmp(other).expect("float is NaN")
     }
 }
 
diff --git a/src/image.rs b/src/image.rs
index a7b625037..3d80896fc 100644
--- a/src/image.rs
+++ b/src/image.rs
@@ -67,7 +67,7 @@ impl ImageStore {
             Entry::Vacant(entry) => {
                 let buffer = self.loader.load(path)?;
                 let ext = path.extension().and_then(OsStr::to_str).unwrap_or_default();
-                let image = Image::parse(&buffer, &ext)?;
+                let image = Image::parse(&buffer, ext)?;
                 let id = ImageId(self.images.len() as u32);
                 if let Some(callback) = &self.on_load {
                     callback(id, &image);
diff --git a/src/layout/incremental.rs b/src/layout/incremental.rs
index 60b198ff9..4c046051b 100644
--- a/src/layout/incremental.rs
+++ b/src/layout/incremental.rs
@@ -377,22 +377,14 @@ pub struct PatternProperties {
 impl PatternProperties {
     /// Check if it is vital to keep an entry based on its properties.
     pub fn must_keep(&self) -> bool {
-        if self.top_level && !self.mature {
-            // Keep an undo stack.
-            true
-        } else if self.all_zeros && !self.mature {
-            // Keep the most recently created items, even if they have not yet
-            // been used.
-            true
-        } else if self.multi_use && !self.abandoned {
-            true
-        } else if self.hit {
-            true
-        } else if self.sparse {
-            true
-        } else {
-            false
-        }
+        // Keep an undo stack.
+        (self.top_level && !self.mature)
+        // Keep the most recently created items, even if they have not yet
+        // been used.
+        || (self.all_zeros && !self.mature)
+        || (self.multi_use && !self.abandoned)
+        || self.hit
+        || self.sparse
     }
 }
 
diff --git a/src/layout/mod.rs b/src/layout/mod.rs
index 114e74914..4c982bb85 100644
--- a/src/layout/mod.rs
+++ b/src/layout/mod.rs
@@ -282,7 +282,10 @@ impl Debug for PackedNode {
 
 impl PartialEq for PackedNode {
     fn eq(&self, other: &Self) -> bool {
-        Rc::as_ptr(&self.node) as *const () == Rc::as_ptr(&other.node) as *const ()
+        std::ptr::eq(
+            Rc::as_ptr(&self.node) as *const (),
+            Rc::as_ptr(&other.node) as *const (),
+        )
     }
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index 79b1a8f26..fd1291ed3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,6 +30,10 @@
 //! [cache]: layout::LayoutCache
 //! [PDF]: export::pdf
 
+#![allow(clippy::len_without_is_empty)]
+#![allow(clippy::or_fun_call)]
+#![allow(clippy::try_err)]
+
 #[macro_use]
 pub mod util;
 #[macro_use]
diff --git a/src/library/align.rs b/src/library/align.rs
index 16c449053..5f21fa378 100644
--- a/src/library/align.rs
+++ b/src/library/align.rs
@@ -6,16 +6,14 @@ use super::ParNode;
 /// `align`: Configure the alignment along the layouting axes.
 pub fn align(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
     let aligns: Spec<_> = args.find().unwrap_or_default();
-    let body: Node = args.expect("body")?;
+    let body: PackedNode = args.expect("body")?;
 
     let mut styles = Styles::new();
     if let Some(align) = aligns.x {
         styles.set(ParNode::ALIGN, align);
     }
 
-    Ok(Value::block(
-        body.into_block().styled(styles).aligned(aligns),
-    ))
+    Ok(Value::block(body.styled(styles).aligned(aligns)))
 }
 
 dynamic! {
diff --git a/src/library/columns.rs b/src/library/columns.rs
index df55fb521..f5d06e563 100644
--- a/src/library/columns.rs
+++ b/src/library/columns.rs
@@ -5,13 +5,10 @@ use super::ParNode;
 
 /// `columns`: Set content into multiple columns.
 pub fn columns(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
-    let columns = args.expect("column count")?;
-    let gutter = args.named("gutter")?.unwrap_or(Relative::new(0.04).into());
-    let body: Node = args.expect("body")?;
     Ok(Value::block(ColumnsNode {
-        columns,
-        gutter,
-        child: body.into_block(),
+        columns: args.expect("column count")?,
+        gutter: args.named("gutter")?.unwrap_or(Relative::new(0.04).into()),
+        child: args.expect("body")?,
     }))
 }
 
diff --git a/src/library/flow.rs b/src/library/flow.rs
index 810e566ae..10d570224 100644
--- a/src/library/flow.rs
+++ b/src/library/flow.rs
@@ -18,7 +18,7 @@ impl Layout for FlowNode {
         ctx: &mut LayoutContext,
         regions: &Regions,
     ) -> Vec<Constrained<Rc<Frame>>> {
-        FlowLayouter::new(self, regions).layout(ctx)
+        FlowLayouter::new(self, regions.clone()).layout(ctx)
     }
 }
 
@@ -32,12 +32,12 @@ impl Debug for FlowNode {
 /// A child of a flow node.
 #[derive(Hash)]
 pub enum FlowChild {
-    /// A paragraph/block break.
-    Break(Styles),
     /// Vertical spacing between other children.
     Spacing(SpacingNode),
     /// An arbitrary node.
     Node(PackedNode),
+    /// A paragraph/block break.
+    Break(Styles),
     /// Skip the rest of the region and move to the next.
     Skip,
 }
@@ -46,9 +46,9 @@ impl FlowChild {
     /// A reference to the child's styles.
     pub fn styles(&self) -> Option<&Styles> {
         match self {
-            Self::Break(styles) => Some(styles),
             Self::Spacing(node) => Some(&node.styles),
             Self::Node(node) => Some(&node.styles),
+            Self::Break(styles) => Some(styles),
             Self::Skip => None,
         }
     }
@@ -56,9 +56,9 @@ impl FlowChild {
     /// A mutable reference to the child's styles.
     pub fn styles_mut(&mut self) -> Option<&mut Styles> {
         match self {
-            Self::Break(styles) => Some(styles),
             Self::Spacing(node) => Some(&mut node.styles),
             Self::Node(node) => Some(&mut node.styles),
+            Self::Break(styles) => Some(styles),
             Self::Skip => None,
         }
     }
@@ -67,14 +67,14 @@ impl FlowChild {
 impl Debug for FlowChild {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         match self {
+            Self::Spacing(node) => node.fmt(f),
+            Self::Node(node) => node.fmt(f),
             Self::Break(styles) => {
                 if f.alternate() {
                     styles.fmt(f)?;
                 }
                 write!(f, "Break")
             }
-            Self::Spacing(node) => node.fmt(f),
-            Self::Node(node) => node.fmt(f),
             Self::Skip => f.pad("Skip"),
         }
     }
@@ -84,10 +84,10 @@ impl Debug for FlowChild {
 struct FlowLayouter<'a> {
     /// The flow node to layout.
     children: &'a [FlowChild],
-    /// Whether the flow should expand to fill the region.
-    expand: Spec<bool>,
     /// The regions to layout children into.
     regions: Regions,
+    /// Whether the flow should expand to fill the region.
+    expand: Spec<bool>,
     /// The full size of `regions.current` that was available before we started
     /// subtracting.
     full: Size,
@@ -115,19 +115,18 @@ enum FlowItem {
 
 impl<'a> FlowLayouter<'a> {
     /// Create a new flow layouter.
-    fn new(flow: &'a FlowNode, regions: &Regions) -> Self {
+    fn new(flow: &'a FlowNode, mut regions: Regions) -> Self {
         let expand = regions.expand;
         let full = regions.current;
 
         // Disable vertical expansion for children.
-        let mut regions = regions.clone();
         regions.expand.y = false;
 
         Self {
             children: &flow.0,
+            regions,
             expand,
             full,
-            regions,
             used: Size::zero(),
             fr: Fractional::zero(),
             items: vec![],
@@ -139,6 +138,16 @@ impl<'a> FlowLayouter<'a> {
     fn layout(mut self, ctx: &mut LayoutContext) -> Vec<Constrained<Rc<Frame>>> {
         for child in self.children {
             match child {
+                FlowChild::Spacing(node) => {
+                    self.layout_spacing(node.kind);
+                }
+                FlowChild::Node(node) => {
+                    if self.regions.is_full() {
+                        self.finish_region();
+                    }
+
+                    self.layout_node(ctx, node);
+                }
                 FlowChild::Break(styles) => {
                     let chain = styles.chain(&ctx.styles);
                     let em = chain.get(TextNode::SIZE).abs;
@@ -148,20 +157,6 @@ impl<'a> FlowLayouter<'a> {
                 FlowChild::Skip => {
                     self.finish_region();
                 }
-                FlowChild::Spacing(node) => match node.kind {
-                    SpacingKind::Linear(v) => self.layout_absolute(v),
-                    SpacingKind::Fractional(v) => {
-                        self.items.push(FlowItem::Fractional(v));
-                        self.fr += v;
-                    }
-                },
-                FlowChild::Node(node) => {
-                    if self.regions.is_full() {
-                        self.finish_region();
-                    }
-
-                    self.layout_node(ctx, node);
-                }
             }
         }
 
@@ -169,6 +164,17 @@ impl<'a> FlowLayouter<'a> {
         self.finished
     }
 
+    /// Layout spacing.
+    fn layout_spacing(&mut self, spacing: SpacingKind) {
+        match spacing {
+            SpacingKind::Linear(v) => self.layout_absolute(v),
+            SpacingKind::Fractional(v) => {
+                self.items.push(FlowItem::Fractional(v));
+                self.fr += v;
+            }
+        }
+    }
+
     /// Layout absolute spacing.
     fn layout_absolute(&mut self, amount: Linear) {
         // Resolve the linear, limiting it to the remaining available space.
diff --git a/src/library/grid.rs b/src/library/grid.rs
index 3292cfe0d..cc636afc9 100644
--- a/src/library/grid.rs
+++ b/src/library/grid.rs
@@ -15,7 +15,7 @@ pub fn grid(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
             column_gutter.unwrap_or_else(|| base_gutter.clone()),
             row_gutter.unwrap_or(base_gutter),
         ),
-        children: args.all().map(Node::into_block).collect(),
+        children: args.all().collect(),
     }))
 }
 
@@ -87,8 +87,6 @@ castable! {
 struct GridLayouter<'a> {
     /// The children of the grid.
     children: &'a [PackedNode],
-    /// Whether the grid should expand to fill the region.
-    expand: Spec<bool>,
     /// The column tracks including gutter tracks.
     cols: Vec<TrackSizing>,
     /// The row tracks including gutter tracks.
@@ -97,6 +95,10 @@ struct GridLayouter<'a> {
     regions: Regions,
     /// Resolved column sizes.
     rcols: Vec<Length>,
+    /// Rows in the current region.
+    lrows: Vec<Row>,
+    /// Whether the grid should expand to fill the region.
+    expand: Spec<bool>,
     /// The full height of the current region.
     full: Length,
     /// The used-up size of the current region. The horizontal size is
@@ -104,8 +106,6 @@ struct GridLayouter<'a> {
     used: Size,
     /// The sum of fractional ratios in the current region.
     fr: Fractional,
-    /// Rows in the current region.
-    lrows: Vec<Row>,
     /// Constraints for the active region.
     cts: Constraints,
     /// Frames for finished regions.
@@ -161,22 +161,26 @@ impl<'a> GridLayouter<'a> {
         cols.pop();
         rows.pop();
 
+        let expand = regions.expand;
+        let full = regions.current.y;
+        let rcols = vec![Length::zero(); cols.len()];
+        let lrows = vec![];
+
         // We use the regions for auto row measurement. Since at that moment,
         // columns are already sized, we can enable horizontal expansion.
-        let expand = regions.expand;
         regions.expand = Spec::new(true, false);
 
         Self {
             children: &grid.children,
-            expand,
-            rcols: vec![Length::zero(); cols.len()],
             cols,
             rows,
-            full: regions.current.y,
             regions,
+            rcols,
+            lrows,
+            expand,
+            full,
             used: Size::zero(),
             fr: Fractional::zero(),
-            lrows: vec![],
             cts: Constraints::new(expand),
             finished: vec![],
         }
diff --git a/src/library/heading.rs b/src/library/heading.rs
index a0b787f34..f2ed3194a 100644
--- a/src/library/heading.rs
+++ b/src/library/heading.rs
@@ -16,7 +16,7 @@ pub struct HeadingNode {
 #[properties]
 impl HeadingNode {
     /// The heading's font family.
-    pub const FAMILY: Smart<String> = Smart::Auto;
+    pub const FAMILY: Smart<FontFamily> = Smart::Auto;
     /// The fill color of heading in the text. Just the surrounding text color
     /// if `auto`.
     pub const FILL: Smart<Paint> = Smart::Auto;
@@ -25,7 +25,7 @@ impl HeadingNode {
 impl Construct for HeadingNode {
     fn construct(_: &mut EvalContext, args: &mut Args) -> TypResult<Node> {
         Ok(Node::block(Self {
-            child: args.expect::<Node>("body")?.into_block(),
+            child: args.expect("body")?,
             level: args.named("level")?.unwrap_or(1),
         }))
     }
@@ -50,8 +50,9 @@ impl Layout for HeadingNode {
         ctx.styles.set(TextNode::SIZE, Relative::new(upscale).into());
 
         if let Smart::Custom(family) = ctx.styles.get_ref(Self::FAMILY) {
-            let list: Vec<_> = std::iter::once(FontFamily::named(family))
-                .chain(ctx.styles.get_ref(TextNode::FAMILY_LIST).iter().cloned())
+            let list = std::iter::once(family)
+                .chain(ctx.styles.get_ref(TextNode::FAMILY_LIST))
+                .cloned()
                 .collect();
             ctx.styles.set(TextNode::FAMILY_LIST, list);
         }
diff --git a/src/library/list.rs b/src/library/list.rs
index f407d8e92..765cc22bc 100644
--- a/src/library/list.rs
+++ b/src/library/list.rs
@@ -26,12 +26,7 @@ impl<L: Labelling> Construct for ListNode<L> {
     fn construct(_: &mut EvalContext, args: &mut Args) -> TypResult<Node> {
         Ok(args
             .all()
-            .map(|node: Node| {
-                Node::block(Self {
-                    child: node.into_block(),
-                    labelling: L::default(),
-                })
-            })
+            .map(|child: PackedNode| Node::block(Self { child, labelling: L::default() }))
             .sum())
     }
 }
diff --git a/src/library/mod.rs b/src/library/mod.rs
index 61d3ccc04..0cdabcb0b 100644
--- a/src/library/mod.rs
+++ b/src/library/mod.rs
@@ -193,3 +193,9 @@ castable! {
     Expected: "string",
     Value::Str(string) => string.into(),
 }
+
+castable! {
+    PackedNode,
+    Expected: "node",
+    Value::Node(node) => node.into_block(),
+}
diff --git a/src/library/pad.rs b/src/library/pad.rs
index 70d88b412..96da7a0a2 100644
--- a/src/library/pad.rs
+++ b/src/library/pad.rs
@@ -9,7 +9,7 @@ pub fn pad(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
     let top = args.named("top")?;
     let right = args.named("right")?;
     let bottom = args.named("bottom")?;
-    let body: Node = args.expect("body")?;
+    let body: PackedNode = args.expect("body")?;
     let padding = Sides::new(
         left.or(all).unwrap_or_default(),
         top.or(all).unwrap_or_default(),
@@ -17,7 +17,7 @@ pub fn pad(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
         bottom.or(all).unwrap_or_default(),
     );
 
-    Ok(Value::block(body.into_block().padded(padding)))
+    Ok(Value::block(body.padded(padding)))
 }
 
 /// A node that adds padding to its child.
diff --git a/src/library/page.rs b/src/library/page.rs
index 00f2dfc6a..520cdaef0 100644
--- a/src/library/page.rs
+++ b/src/library/page.rs
@@ -44,8 +44,8 @@ impl PageNode {
 impl Construct for PageNode {
     fn construct(_: &mut EvalContext, args: &mut Args) -> TypResult<Node> {
         Ok(Node::Page(Self {
-            child: args.expect::<Node>("body")?.into_block(),
             styles: Styles::new(),
+            child: args.expect("body")?,
         }))
     }
 }
@@ -114,6 +114,7 @@ impl PageNode {
             bottom: ctx.styles.get(Self::BOTTOM).unwrap_or(default.bottom),
         };
 
+        // Realize columns with columns node.
         let columns = ctx.styles.get(Self::COLUMNS);
         let child = if columns.get() > 1 {
             ColumnsNode {
@@ -126,14 +127,14 @@ impl PageNode {
             self.child.clone()
         };
 
-        // Pad the child.
-        let padded = PadNode { child, padding }.pack();
+        // Realize margins with padding node.
+        let child = PadNode { child, padding }.pack();
 
         // Layout the child.
         let expand = size.map(Length::is_finite);
         let regions = Regions::repeat(size, size, expand);
         let mut frames: Vec<_> =
-            padded.layout(ctx, &regions).into_iter().map(|c| c.item).collect();
+            child.layout(ctx, &regions).into_iter().map(|c| c.item).collect();
 
         // Add background fill if requested.
         if let Some(fill) = ctx.styles.get(Self::FILL) {
@@ -238,12 +239,12 @@ macro_rules! papers {
         }
 
         impl FromStr for Paper {
-            type Err = ParsePaperError;
+            type Err = PaperError;
 
             fn from_str(name: &str) -> Result<Self, Self::Err> {
                 match name.to_lowercase().as_str() {
                     $($($pats)* => Ok(Self::$var),)*
-                    _ => Err(ParsePaperError),
+                    _ => Err(PaperError),
                 }
             }
         }
@@ -413,12 +414,12 @@ castable! {
 
 /// The error when parsing a [`Paper`] from a string fails.
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
-pub struct ParsePaperError;
+pub struct PaperError;
 
-impl Display for ParsePaperError {
+impl Display for PaperError {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad("invalid paper name")
     }
 }
 
-impl std::error::Error for ParsePaperError {}
+impl std::error::Error for PaperError {}
diff --git a/src/library/par.rs b/src/library/par.rs
index 2c12f9f64..2bedc98b8 100644
--- a/src/library/par.rs
+++ b/src/library/par.rs
@@ -30,7 +30,7 @@ impl ParNode {
 impl Construct for ParNode {
     fn construct(_: &mut EvalContext, args: &mut Args) -> TypResult<Node> {
         // Lift to a block so that it doesn't merge with adjacent stuff.
-        Ok(Node::Block(args.expect::<Node>("body")?.into_block()))
+        Ok(Node::Block(args.expect("body")?))
     }
 }
 
@@ -60,10 +60,8 @@ impl Set for ParNode {
                     bail!(span, "must be horizontal");
                 }
                 Some(v)
-            } else if let Some(dir) = dir {
-                Some(if dir == Dir::LTR { Align::Left } else { Align::Right })
             } else {
-                None
+                dir.map(|dir| dir.start().into())
             };
 
         styles.set_opt(Self::DIR, dir);
@@ -85,7 +83,8 @@ impl Layout for ParNode {
         let text = self.collect_text();
 
         // Find out the BiDi embedding levels.
-        let bidi = BidiInfo::new(&text, Level::from_dir(ctx.styles.get(Self::DIR)));
+        let level = Level::from_dir(ctx.styles.get(Self::DIR));
+        let bidi = BidiInfo::new(&text, level);
 
         // Prepare paragraph layout by building a representation on which we can
         // do line breaking without layouting each and every line from scratch.
@@ -255,7 +254,7 @@ impl<'a> ParLayouter<'a> {
                         let subrange = start .. cursor;
                         let text = &bidi.text[subrange.clone()];
                         let styles = node.styles.chain(&ctx.styles);
-                        let shaped = shape(&mut ctx.fonts, text, styles, level.dir());
+                        let shaped = shape(ctx.fonts, text, styles, level.dir());
                         items.push(ParItem::Text(shaped));
                         ranges.push(subrange);
                     }
@@ -446,7 +445,7 @@ impl<'a> LineLayout<'a> {
                 // empty string.
                 if !range.is_empty() || rest.is_empty() {
                     // Reshape that part.
-                    let reshaped = shaped.reshape(&mut ctx.fonts, range);
+                    let reshaped = shaped.reshape(ctx.fonts, range);
                     last = Some(ParItem::Text(reshaped));
                 }
 
@@ -467,7 +466,7 @@ impl<'a> LineLayout<'a> {
             // Reshape if necessary.
             if range.len() < shaped.text.len() {
                 if !range.is_empty() {
-                    let reshaped = shaped.reshape(&mut ctx.fonts, range);
+                    let reshaped = shaped.reshape(ctx.fonts, range);
                     first = Some(ParItem::Text(reshaped));
                 }
 
@@ -531,7 +530,7 @@ impl<'a> LineLayout<'a> {
             match item {
                 ParItem::Absolute(v) => offset += *v,
                 ParItem::Fractional(v) => offset += v.resolve(self.fr, remaining),
-                ParItem::Text(shaped) => position(shaped.build(&ctx.fonts)),
+                ParItem::Text(shaped) => position(shaped.build(ctx.fonts)),
                 ParItem::Frame(frame) => position(frame.clone()),
             }
         }
diff --git a/src/library/placed.rs b/src/library/placed.rs
index bdf3e2cd3..5d98edc4d 100644
--- a/src/library/placed.rs
+++ b/src/library/placed.rs
@@ -8,9 +8,9 @@ pub fn place(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
     let aligns = args.find().unwrap_or(Spec::new(Some(Align::Left), None));
     let tx = args.named("dx")?.unwrap_or_default();
     let ty = args.named("dy")?.unwrap_or_default();
-    let body: Node = args.expect("body")?;
+    let body: PackedNode = args.expect("body")?;
     Ok(Value::block(PlacedNode(
-        body.into_block().moved(Point::new(tx, ty)).aligned(aligns),
+        body.moved(Point::new(tx, ty)).aligned(aligns),
     )))
 }
 
diff --git a/src/library/shape.rs b/src/library/shape.rs
index 3eb1a794a..15a857ef6 100644
--- a/src/library/shape.rs
+++ b/src/library/shape.rs
@@ -79,9 +79,7 @@ fn shape_impl(
     }
 
     // The shape's contents.
-    let child = args
-        .find()
-        .map(|body: Node| body.into_block().padded(Sides::splat(padding)));
+    let child = args.find().map(|body: PackedNode| body.padded(Sides::splat(padding)));
 
     Ok(Value::inline(
         ShapeNode { kind, fill, stroke, child }
diff --git a/src/library/sized.rs b/src/library/sized.rs
index 49b515cfb..81ca69c2e 100644
--- a/src/library/sized.rs
+++ b/src/library/sized.rs
@@ -6,16 +6,14 @@ use super::prelude::*;
 pub fn box_(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
     let width = args.named("width")?;
     let height = args.named("height")?;
-    let body: Node = args.find().unwrap_or_default();
-    Ok(Value::inline(
-        body.into_block().sized(Spec::new(width, height)),
-    ))
+    let body: PackedNode = args.find().unwrap_or_default();
+    Ok(Value::inline(body.sized(Spec::new(width, height))))
 }
 
 /// `block`: Place content into the flow.
 pub fn block(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
-    let body: Node = args.find().unwrap_or_default();
-    Ok(Value::block(body.into_block()))
+    let body: PackedNode = args.find().unwrap_or_default();
+    Ok(Value::block(body))
 }
 
 /// A node that sizes its child.
diff --git a/src/library/stack.rs b/src/library/stack.rs
index dfe5e2455..d7748378c 100644
--- a/src/library/stack.rs
+++ b/src/library/stack.rs
@@ -1,33 +1,15 @@
 //! Side-by-side layout of nodes along an axis.
 
-use std::fmt::{self, Debug, Formatter};
-
 use super::prelude::*;
 use super::{AlignNode, SpacingKind, SpacingNode};
 
 /// `stack`: Stack children along an axis.
 pub fn stack(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
-    let dir = args.named("dir")?.unwrap_or(Dir::TTB);
-    let spacing = args.named("spacing")?;
-
-    let mut children = vec![];
-    let mut deferred = None;
-
-    // Build the list of stack children.
-    for child in args.all() {
-        match child {
-            StackChild::Spacing(_) => deferred = None,
-            StackChild::Node(_) => {
-                if let Some(v) = deferred {
-                    children.push(StackChild::spacing(v));
-                }
-                deferred = spacing;
-            }
-        }
-        children.push(child);
-    }
-
-    Ok(Value::block(StackNode { dir, children }))
+    Ok(Value::block(StackNode {
+        dir: args.named("dir")?.unwrap_or(Dir::TTB),
+        spacing: args.named("spacing")?,
+        children: args.all().collect(),
+    }))
 }
 
 /// A node that stacks its children.
@@ -35,6 +17,8 @@ pub fn stack(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
 pub struct StackNode {
     /// The stacking direction.
     pub dir: Dir,
+    /// The spacing between non-spacing children.
+    pub spacing: Option<SpacingKind>,
     /// The children to be stacked.
     pub children: Vec<StackChild>,
 }
@@ -45,7 +29,7 @@ impl Layout for StackNode {
         ctx: &mut LayoutContext,
         regions: &Regions,
     ) -> Vec<Constrained<Rc<Frame>>> {
-        StackLayouter::new(self, regions).layout(ctx)
+        StackLayouter::new(self, regions.clone()).layout(ctx)
     }
 }
 
@@ -58,9 +42,8 @@ pub enum StackChild {
     Node(PackedNode),
 }
 
-impl StackChild {
-    /// Create a spacing node from a spacing kind.
-    pub fn spacing(kind: SpacingKind) -> Self {
+impl From<SpacingKind> for StackChild {
+    fn from(kind: SpacingKind) -> Self {
         Self::Spacing(SpacingNode { kind, styles: Styles::new() })
     }
 }
@@ -77,23 +60,27 @@ impl Debug for StackChild {
 castable! {
     StackChild,
     Expected: "linear, fractional or template",
-    Value::Length(v) => Self::spacing(SpacingKind::Linear(v.into())),
-    Value::Relative(v) => Self::spacing(SpacingKind::Linear(v.into())),
-    Value::Linear(v) => Self::spacing(SpacingKind::Linear(v)),
-    Value::Fractional(v) => Self::spacing(SpacingKind::Fractional(v)),
+    Value::Length(v) => SpacingKind::Linear(v.into()).into(),
+    Value::Relative(v) => SpacingKind::Linear(v.into()).into(),
+    Value::Linear(v) => SpacingKind::Linear(v).into(),
+    Value::Fractional(v) => SpacingKind::Fractional(v).into(),
     Value::Node(v) => Self::Node(v.into_block()),
 }
 
 /// Performs stack layout.
 struct StackLayouter<'a> {
-    /// The stack node to layout.
-    stack: &'a StackNode,
-    /// The axis of the block direction.
+    /// The flow node to layout.
+    children: &'a [StackChild],
+    /// The stacking direction.
+    dir: Dir,
+    /// The axis of the stacking direction.
     axis: SpecAxis,
-    /// Whether the stack should expand to fill the region.
-    expand: Spec<bool>,
+    /// The spacing between non-spacing children.
+    spacing: Option<SpacingKind>,
     /// The regions to layout children into.
     regions: Regions,
+    /// Whether the stack should expand to fill the region.
+    expand: Spec<bool>,
     /// The full size of `regions.current` that was available before we started
     /// subtracting.
     full: Size,
@@ -119,21 +106,23 @@ enum StackItem {
 
 impl<'a> StackLayouter<'a> {
     /// Create a new stack layouter.
-    fn new(stack: &'a StackNode, regions: &Regions) -> Self {
-        let axis = stack.dir.axis();
+    fn new(stack: &'a StackNode, mut regions: Regions) -> Self {
+        let dir = stack.dir;
+        let axis = dir.axis();
         let expand = regions.expand;
         let full = regions.current;
 
         // Disable expansion along the block axis for children.
-        let mut regions = regions.clone();
         regions.expand.set(axis, false);
 
         Self {
-            stack,
+            children: &stack.children,
+            dir,
             axis,
+            spacing: stack.spacing,
+            regions,
             expand,
             full,
-            regions,
             used: Gen::zero(),
             fr: Fractional::zero(),
             items: vec![],
@@ -143,21 +132,26 @@ impl<'a> StackLayouter<'a> {
 
     /// Layout all children.
     fn layout(mut self, ctx: &mut LayoutContext) -> Vec<Constrained<Rc<Frame>>> {
-        for child in &self.stack.children {
+        // Spacing to insert before the next node.
+        let mut deferred = None;
+
+        for child in self.children {
             match child {
-                StackChild::Spacing(node) => match node.kind {
-                    SpacingKind::Linear(v) => self.layout_absolute(v),
-                    SpacingKind::Fractional(v) => {
-                        self.items.push(StackItem::Fractional(v));
-                        self.fr += v;
-                    }
-                },
+                StackChild::Spacing(node) => {
+                    self.layout_spacing(node.kind);
+                    deferred = None;
+                }
                 StackChild::Node(node) => {
+                    if let Some(kind) = deferred {
+                        self.layout_spacing(kind);
+                    }
+
                     if self.regions.is_full() {
                         self.finish_region();
                     }
 
                     self.layout_node(ctx, node);
+                    deferred = self.spacing;
                 }
             }
         }
@@ -166,6 +160,17 @@ impl<'a> StackLayouter<'a> {
         self.finished
     }
 
+    /// Layout spacing.
+    fn layout_spacing(&mut self, spacing: SpacingKind) {
+        match spacing {
+            SpacingKind::Linear(v) => self.layout_absolute(v),
+            SpacingKind::Fractional(v) => {
+                self.items.push(StackItem::Fractional(v));
+                self.fr += v;
+            }
+        }
+    }
+
     /// Layout absolute spacing.
     fn layout_absolute(&mut self, amount: Linear) {
         // Resolve the linear, limiting it to the remaining available space.
@@ -183,7 +188,7 @@ impl<'a> StackLayouter<'a> {
         let align = node
             .downcast::<AlignNode>()
             .and_then(|node| node.aligns.get(self.axis))
-            .unwrap_or(self.stack.dir.start().into());
+            .unwrap_or(self.dir.start().into());
 
         let frames = node.layout(ctx, &self.regions);
         let len = frames.len();
@@ -218,7 +223,7 @@ impl<'a> StackLayouter<'a> {
 
         let mut output = Frame::new(size);
         let mut cursor = Length::zero();
-        let mut ruler: Align = self.stack.dir.start().into();
+        let mut ruler: Align = self.dir.start().into();
 
         // Place all frames.
         for item in self.items.drain(..) {
@@ -230,7 +235,7 @@ impl<'a> StackLayouter<'a> {
                     cursor += v.resolve(self.fr, remaining);
                 }
                 StackItem::Frame(frame, align) => {
-                    if self.stack.dir.is_positive() {
+                    if self.dir.is_positive() {
                         ruler = ruler.max(align);
                     } else {
                         ruler = ruler.min(align);
@@ -240,7 +245,7 @@ impl<'a> StackLayouter<'a> {
                     let parent = size.get(self.axis);
                     let child = frame.size.get(self.axis);
                     let block = ruler.resolve(parent - self.used.main)
-                        + if self.stack.dir.is_positive() {
+                        + if self.dir.is_positive() {
                             cursor
                         } else {
                             self.used.main - child - cursor
diff --git a/src/library/text.rs b/src/library/text.rs
index df71fec9e..26e949fc9 100644
--- a/src/library/text.rs
+++ b/src/library/text.rs
@@ -173,13 +173,6 @@ pub enum FontFamily {
     Named(NamedFamily),
 }
 
-impl FontFamily {
-    /// Create a named font family variant, directly from a string.
-    pub fn named(string: &str) -> Self {
-        Self::Named(NamedFamily::new(string))
-    }
-}
-
 impl Debug for FontFamily {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         match self {
@@ -193,13 +186,13 @@ impl Debug for FontFamily {
 
 dynamic! {
     FontFamily: "font family",
-    Value::Str(string) => Self::named(&string),
+    Value::Str(string) => Self::Named(NamedFamily::new(&string)),
 }
 
 castable! {
     Vec<FontFamily>,
     Expected: "string, generic family or array thereof",
-    Value::Str(string) => vec![FontFamily::named(&string)],
+    Value::Str(string) => vec![FontFamily::Named(NamedFamily::new(&string))],
     Value::Array(values) => {
         values.into_iter().filter_map(|v| v.cast().ok()).collect()
     },
diff --git a/src/library/transform.rs b/src/library/transform.rs
index ef468d7b4..03f0a84c9 100644
--- a/src/library/transform.rs
+++ b/src/library/transform.rs
@@ -28,15 +28,13 @@ pub fn rotate(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
 }
 
 fn transform_impl(args: &mut Args, transform: Transform) -> TypResult<Value> {
-    let body: Node = args.expect("body")?;
+    let body: PackedNode = args.expect("body")?;
     let origin = args
         .named("origin")?
         .unwrap_or(Spec::splat(None))
         .unwrap_or(Align::CENTER_HORIZON);
 
-    Ok(Value::inline(
-        body.into_block().transformed(transform, origin),
-    ))
+    Ok(Value::inline(body.transformed(transform, origin)))
 }
 
 /// A node that transforms its child without affecting layout.
diff --git a/src/parse/mod.rs b/src/parse/mod.rs
index 0a2f73f5b..10aaad234 100644
--- a/src/parse/mod.rs
+++ b/src/parse/mod.rs
@@ -275,13 +275,13 @@ fn primary(p: &mut Parser, atomic: bool) -> ParseResult {
 
         Some(NodeKind::Error(_, _)) => {
             p.eat();
-            Err(())
+            Err(ParseError)
         }
 
         // Nothing.
         _ => {
             p.expected("expression");
-            Err(())
+            Err(ParseError)
         }
     }
 }
@@ -428,7 +428,7 @@ fn item(p: &mut Parser) -> ParseResult<NodeKind> {
                 marker.end(p, error);
                 p.eat();
                 expr(p).ok();
-                Err(())
+                Err(ParseError)
             }
         })?;
 
@@ -519,7 +519,7 @@ fn args(p: &mut Parser, direct: bool, brackets: bool) -> ParseResult {
         Some(NodeKind::LeftBracket) if brackets => {}
         _ => {
             p.expected("argument list");
-            return Err(());
+            return Err(ParseError);
         }
     }
 
@@ -689,7 +689,7 @@ fn ident(p: &mut Parser) -> ParseResult {
         }
         _ => {
             p.expected("identifier");
-            Err(())
+            Err(ParseError)
         }
     }
 }
@@ -701,7 +701,7 @@ fn body(p: &mut Parser) -> ParseResult {
         Some(NodeKind::LeftBrace) => block(p),
         _ => {
             p.expected_at("body");
-            return Err(());
+            return Err(ParseError);
         }
     }
     Ok(())
diff --git a/src/parse/parser.rs b/src/parse/parser.rs
index 503158a94..af8a7c5ca 100644
--- a/src/parse/parser.rs
+++ b/src/parse/parser.rs
@@ -1,13 +1,10 @@
+use std::fmt::{self, Display, Formatter};
 use std::mem;
 
 use super::{TokenMode, Tokens};
 use crate::syntax::{ErrorPos, Green, GreenData, GreenNode, NodeKind};
 use crate::util::EcoString;
 
-/// Allows parser methods to use the try operator. Not exposed as the parser
-/// recovers from all errors.
-pub(crate) type ParseResult<T = ()> = Result<T, ()>;
-
 /// A convenient token-based parser.
 pub struct Parser<'s> {
     /// An iterator over the source tokens.
@@ -121,7 +118,7 @@ impl<'s> Parser<'s> {
         if !eaten {
             self.expected_at(t.as_str());
         }
-        if eaten { Ok(()) } else { Err(()) }
+        if eaten { Ok(()) } else { Err(ParseError) }
     }
 
     /// Eat, debug-asserting that the token is the given one.
@@ -448,3 +445,19 @@ pub enum Group {
     /// A group for import items, ended by a semicolon, line break or `from`.
     Imports,
 }
+
+/// Allows parser methods to use the try operator. Never returned top-level
+/// because the parser recovers from all errors.
+pub type ParseResult<T = ()> = Result<T, ParseError>;
+
+/// The error type for parsing.
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub struct ParseError;
+
+impl Display for ParseError {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        f.pad("failed to parse")
+    }
+}
+
+impl std::error::Error for ParseError {}
diff --git a/src/syntax/pretty.rs b/src/syntax/pretty.rs
index 62ecb8cd4..e74829b0c 100644
--- a/src/syntax/pretty.rs
+++ b/src/syntax/pretty.rs
@@ -21,6 +21,7 @@ pub trait Pretty {
 }
 
 /// A buffer into which items can be pretty printed.
+#[derive(Default)]
 pub struct Printer {
     buf: String,
 }
@@ -28,7 +29,7 @@ pub struct Printer {
 impl Printer {
     /// Create a new pretty printer.
     pub fn new() -> Self {
-        Self { buf: String::new() }
+        Self::default()
     }
 
     /// Push a character into the buffer.