diff --git a/crates/typst-ide/src/complete.rs b/crates/typst-ide/src/complete.rs
index 946795521..a05be9f83 100644
--- a/crates/typst-ide/src/complete.rs
+++ b/crates/typst-ide/src/complete.rs
@@ -1178,7 +1178,7 @@ impl<'a> CompletionContext<'a> {
         parens: bool,
         docs: Option<&str>,
     ) {
-        let at = label.as_deref().map_or(false, |field| !is_ident(field));
+        let at = label.as_deref().is_some_and(|field| !is_ident(field));
         let label = label.unwrap_or_else(|| value.repr());
 
         let detail = docs.map(Into::into).or_else(|| match value {
diff --git a/crates/typst-pdf/src/outline.rs b/crates/typst-pdf/src/outline.rs
index adb0df2f7..a060c175f 100644
--- a/crates/typst-pdf/src/outline.rs
+++ b/crates/typst-pdf/src/outline.rs
@@ -55,7 +55,7 @@ pub(crate) fn write_outline(ctx: &mut PdfContext) -> Option<Ref> {
             // exists), or at most as deep as its actual nesting level in Typst
             // (not exceeding whichever is the most restrictive depth limit
             // of those two).
-            while children.last().map_or(false, |last| {
+            while children.last().is_some_and(|last| {
                 last_skipped_level.map_or(true, |l| last.level < l)
                     && last.level < leaf.level
             }) {
diff --git a/crates/typst-syntax/src/ast.rs b/crates/typst-syntax/src/ast.rs
index df9cef0cc..26a26160f 100644
--- a/crates/typst-syntax/src/ast.rs
+++ b/crates/typst-syntax/src/ast.rs
@@ -601,12 +601,12 @@ impl<'a> Raw<'a> {
             let is_whitespace = |line: &&str| line.chars().all(char::is_whitespace);
 
             // Trims a sequence of whitespace followed by a newline at the start.
-            if lines.first().map_or(false, is_whitespace) {
+            if lines.first().is_some_and(is_whitespace) {
                 lines.remove(0);
             }
 
             // Trims a newline followed by a sequence of whitespace at the end.
-            if lines.last().map_or(false, is_whitespace) {
+            if lines.last().is_some_and(is_whitespace) {
                 lines.pop();
             }
         }
diff --git a/crates/typst-syntax/src/lexer.rs b/crates/typst-syntax/src/lexer.rs
index cd1998a6b..300a83537 100644
--- a/crates/typst-syntax/src/lexer.rs
+++ b/crates/typst-syntax/src/lexer.rs
@@ -341,7 +341,7 @@ impl Lexer<'_> {
 
     fn in_word(&self) -> bool {
         let wordy = |c: Option<char>| {
-            c.map_or(false, |c| {
+            c.is_some_and(|c| {
                 c.is_alphanumeric()
                     && !matches!(
                         c.script(),
@@ -538,7 +538,7 @@ impl Lexer<'_> {
         // Make sure not to confuse a range for the decimal separator.
         if c != '.'
             && !self.s.at("..")
-            && !self.s.scout(1).map_or(false, is_id_start)
+            && !self.s.scout(1).is_some_and(is_id_start)
             && self.s.eat_if('.')
             && base == 10
         {
@@ -740,7 +740,7 @@ pub fn is_ident(string: &str) -> bool {
     let mut chars = string.chars();
     chars
         .next()
-        .map_or(false, |c| is_id_start(c) && chars.all(is_id_continue))
+        .is_some_and(|c| is_id_start(c) && chars.all(is_id_continue))
 }
 
 /// Whether a character can start an identifier.
diff --git a/crates/typst-syntax/src/parser.rs b/crates/typst-syntax/src/parser.rs
index 0a740b62b..f4bb19e1c 100644
--- a/crates/typst-syntax/src/parser.rs
+++ b/crates/typst-syntax/src/parser.rs
@@ -1709,7 +1709,7 @@ impl<'s> Parser<'s> {
 
     fn unskip(&mut self) {
         if self.lexer.mode() != LexMode::Markup && self.prev_end != self.current_start {
-            while self.nodes.last().map_or(false, |last| last.kind().is_trivia()) {
+            while self.nodes.last().is_some_and(|last| last.kind().is_trivia()) {
                 self.nodes.pop();
             }
 
diff --git a/crates/typst/src/engine.rs b/crates/typst/src/engine.rs
index a5408d293..f42ea1927 100644
--- a/crates/typst/src/engine.rs
+++ b/crates/typst/src/engine.rs
@@ -139,7 +139,7 @@ impl<'a> Route<'a> {
 impl<'a> Route<'a> {
     /// Whether the given id is part of the route.
     pub fn contains(&self, id: FileId) -> bool {
-        self.id == Some(id) || self.outer.map_or(false, |outer| outer.contains(id))
+        self.id == Some(id) || self.outer.is_some_and(|outer| outer.contains(id))
     }
 
     /// Whether the route's depth is less than or equal to the given depth.
diff --git a/crates/typst/src/foundations/auto.rs b/crates/typst/src/foundations/auto.rs
index 05f776d17..5711b1f6a 100644
--- a/crates/typst/src/foundations/auto.rs
+++ b/crates/typst/src/foundations/auto.rs
@@ -80,6 +80,17 @@ impl<T> Smart<T> {
         matches!(self, Self::Custom(_))
     }
 
+    /// Whether this is a `Smart::Custom(x)` and `f(x)` is true.
+    pub fn is_custom_and<F>(self, f: F) -> bool
+    where
+        F: Fn(T) -> bool,
+    {
+        match self {
+            Self::Auto => false,
+            Self::Custom(x) => f(x),
+        }
+    }
+
     /// Returns a `Smart<&T>` borrowing the inner `T`.
     pub fn as_ref(&self) -> Smart<&T> {
         match self {
@@ -88,9 +99,12 @@ impl<T> Smart<T> {
         }
     }
 
-    /// Returns a reference the contained custom value.
-    /// If the value is [`Smart::Auto`], `None` is returned.
-    pub fn as_custom(self) -> Option<T> {
+    /// Returns the contained custom value.
+    ///
+    /// If the value is [`Smart::Auto`], returns `None`.
+    ///
+    /// Equivalently, this just converts `Smart` to `Option`.
+    pub fn custom(self) -> Option<T> {
         match self {
             Self::Auto => None,
             Self::Custom(x) => Some(x),
diff --git a/crates/typst/src/foundations/datetime.rs b/crates/typst/src/foundations/datetime.rs
index faef8f7fb..053aa4226 100644
--- a/crates/typst/src/foundations/datetime.rs
+++ b/crates/typst/src/foundations/datetime.rs
@@ -306,7 +306,7 @@ impl Datetime {
     ) -> StrResult<Datetime> {
         Ok(engine
             .world
-            .today(offset.as_custom())
+            .today(offset.custom())
             .ok_or("unable to get the current date")?)
     }
 
diff --git a/crates/typst/src/foundations/selector.rs b/crates/typst/src/foundations/selector.rs
index d97c3408a..747ae1a96 100644
--- a/crates/typst/src/foundations/selector.rs
+++ b/crates/typst/src/foundations/selector.rs
@@ -140,7 +140,7 @@ impl Selector {
             Self::Label(label) => target.label() == Some(*label),
             Self::Regex(regex) => target
                 .to_packed::<TextElem>()
-                .map_or(false, |elem| regex.is_match(elem.text())),
+                .is_some_and(|elem| regex.is_match(elem.text())),
             Self::Can(cap) => target.func().can_type_id(*cap),
             Self::Or(selectors) => {
                 selectors.iter().any(move |sel| sel.matches(target, styles))
diff --git a/crates/typst/src/foundations/str.rs b/crates/typst/src/foundations/str.rs
index 48b5baf4f..e1c5d8b09 100644
--- a/crates/typst/src/foundations/str.rs
+++ b/crates/typst/src/foundations/str.rs
@@ -114,7 +114,7 @@ impl Str {
             .and_then(|v| usize::try_from(v).ok())
             .filter(|&v| v <= self.0.len());
 
-        if resolved.map_or(false, |i| !self.0.is_char_boundary(i)) {
+        if resolved.is_some_and(|i| !self.0.is_char_boundary(i)) {
             return Err(not_a_char_boundary(index));
         }
 
@@ -308,7 +308,7 @@ impl Str {
     ) -> bool {
         match pattern {
             StrPattern::Str(pat) => self.0.starts_with(pat.as_str()),
-            StrPattern::Regex(re) => re.find(self).map_or(false, |m| m.start() == 0),
+            StrPattern::Regex(re) => re.find(self).is_some_and(|m| m.start() == 0),
         }
     }
 
diff --git a/crates/typst/src/foundations/styles.rs b/crates/typst/src/foundations/styles.rs
index 07793e82c..95fb96fc0 100644
--- a/crates/typst/src/foundations/styles.rs
+++ b/crates/typst/src/foundations/styles.rs
@@ -381,7 +381,7 @@ impl Recipe {
     pub fn applicable(&self, target: &Content, styles: StyleChain) -> bool {
         self.selector
             .as_ref()
-            .map_or(false, |selector| selector.matches(target, Some(styles)))
+            .is_some_and(|selector| selector.matches(target, Some(styles)))
     }
 
     /// Apply the recipe to the given content.
diff --git a/crates/typst/src/introspection/counter.rs b/crates/typst/src/introspection/counter.rs
index 5c3e573ae..121611a2f 100644
--- a/crates/typst/src/introspection/counter.rs
+++ b/crates/typst/src/introspection/counter.rs
@@ -367,7 +367,7 @@ impl Counter {
         styles: Option<StyleChain>,
     ) -> SourceResult<Value> {
         let numbering = numbering
-            .as_custom()
+            .custom()
             .or_else(|| {
                 let styles = styles?;
                 let CounterKey::Selector(Selector::Elem(func, _)) = self.0 else {
diff --git a/crates/typst/src/layout/flow.rs b/crates/typst/src/layout/flow.rs
index 662cf6804..5023ec244 100644
--- a/crates/typst/src/layout/flow.rs
+++ b/crates/typst/src/layout/flow.rs
@@ -493,7 +493,7 @@ impl<'a> FlowLayouter<'a> {
         while self
             .items
             .last()
-            .map_or(false, |item| matches!(item, FlowItem::Absolute(_, true)))
+            .is_some_and(|item| matches!(item, FlowItem::Absolute(_, true)))
         {
             self.items.pop();
         }
@@ -685,7 +685,7 @@ impl FlowLayouter<'_> {
             // together).
             if !force
                 && (k == 0 || movable)
-                && frames.first().map_or(false, Frame::is_empty)
+                && frames.first().is_some_and(Frame::is_empty)
             {
                 // Remove existing footnotes attempts because we need to
                 // move the item to the next page.
diff --git a/crates/typst/src/layout/inline/linebreak.rs b/crates/typst/src/layout/inline/linebreak.rs
index 3c3416ed4..a62cda910 100644
--- a/crates/typst/src/layout/inline/linebreak.rs
+++ b/crates/typst/src/layout/inline/linebreak.rs
@@ -78,7 +78,7 @@ pub(super) fn breakpoints<'a>(
             let (link, _) = link_prefix(tail);
             let end = last + link.len();
             linebreak_link(link, |i| f(last + i, Breakpoint::Normal));
-            while iter.peek().map_or(false, |&p| p < end) {
+            while iter.peek().is_some_and(|&p| p < end) {
                 iter.next();
             }
         }
diff --git a/crates/typst/src/layout/inline/mod.rs b/crates/typst/src/layout/inline/mod.rs
index f579b8a3a..2802bbcb2 100644
--- a/crates/typst/src/layout/inline/mod.rs
+++ b/crates/typst/src/layout/inline/mod.rs
@@ -655,7 +655,7 @@ fn add_cjk_latin_spacing(items: &mut [Item]) {
             });
 
             // Case 1: CJ followed by a Latin character
-            if glyph.is_cj_script() && next.map_or(false, |g| g.is_letter_or_number()) {
+            if glyph.is_cj_script() && next.is_some_and(|g| g.is_letter_or_number()) {
                 // The spacing is default to 1/4 em, and can be shrunk to 1/8 em.
                 glyph.x_advance += Em::new(0.25);
                 glyph.adjustability.shrinkability.1 += Em::new(0.125);
@@ -663,7 +663,7 @@ fn add_cjk_latin_spacing(items: &mut [Item]) {
             }
 
             // Case 2: Latin followed by a CJ character
-            if glyph.is_cj_script() && prev.map_or(false, |g| g.is_letter_or_number()) {
+            if glyph.is_cj_script() && prev.is_some_and(|g| g.is_letter_or_number()) {
                 glyph.x_advance += Em::new(0.25);
                 glyph.x_offset += Em::new(0.25);
                 glyph.adjustability.shrinkability.0 += Em::new(0.125);
@@ -1374,7 +1374,7 @@ fn reorder<'a>(line: &'a Line<'a>) -> (Vec<&Item<'a>>, bool) {
 
     // Compute the reordered ranges in visual order (left to right).
     let (levels, runs) = line.bidi.visual_runs(para, line.trimmed.clone());
-    let starts_rtl = levels.first().map_or(false, |level| level.is_rtl());
+    let starts_rtl = levels.first().is_some_and(|level| level.is_rtl());
 
     // Collect the reordered items.
     for run in runs {
diff --git a/crates/typst/src/layout/inline/shaping.rs b/crates/typst/src/layout/inline/shaping.rs
index 6b1e2e93d..b558d5adf 100644
--- a/crates/typst/src/layout/inline/shaping.rs
+++ b/crates/typst/src/layout/inline/shaping.rs
@@ -680,7 +680,7 @@ fn shape_segment<'a>(
     let mut buffer = UnicodeBuffer::new();
     buffer.push_str(text);
     buffer.set_language(language(ctx.styles));
-    if let Some(script) = TextElem::script_in(ctx.styles).as_custom().and_then(|script| {
+    if let Some(script) = TextElem::script_in(ctx.styles).custom().and_then(|script| {
         rustybuzz::Script::from_iso15924_tag(Tag::from_bytes(script.as_bytes()))
     }) {
         buffer.set_script(script)
@@ -751,7 +751,7 @@ fn shape_segment<'a>(
         } else {
             // First, search for the end of the tofu sequence.
             let k = i;
-            while infos.get(i + 1).map_or(false, |info| info.glyph_id == 0) {
+            while infos.get(i + 1).is_some_and(|info| info.glyph_id == 0) {
                 i += 1;
             }
 
@@ -781,7 +781,7 @@ fn shape_segment<'a>(
 
             // Trim half-baked cluster.
             let remove = base + start..base + end;
-            while ctx.glyphs.last().map_or(false, |g| remove.contains(&g.range.start)) {
+            while ctx.glyphs.last().is_some_and(|g| remove.contains(&g.range.start)) {
                 ctx.glyphs.pop();
             }
 
@@ -866,7 +866,7 @@ fn track_and_space(ctx: &mut ShapingContext) {
 
         if glyphs
             .peek()
-            .map_or(false, |next| glyph.range.start != next.range.start)
+            .is_some_and(|next| glyph.range.start != next.range.start)
         {
             glyph.x_advance += tracking;
         }
diff --git a/crates/typst/src/layout/page.rs b/crates/typst/src/layout/page.rs
index 04e7dd60d..f5727d57e 100644
--- a/crates/typst/src/layout/page.rs
+++ b/crates/typst/src/layout/page.rs
@@ -360,7 +360,7 @@ impl Packed<PageElem> {
         let two_sided = margin.two_sided.unwrap_or(false);
         let margin = margin
             .sides
-            .map(|side| side.and_then(Smart::as_custom).unwrap_or(default))
+            .map(|side| side.and_then(Smart::custom).unwrap_or(default))
             .resolve(styles)
             .relative_to(size);
 
diff --git a/crates/typst/src/layout/place.rs b/crates/typst/src/layout/place.rs
index 61b07308d..176eaf472 100644
--- a/crates/typst/src/layout/place.rs
+++ b/crates/typst/src/layout/place.rs
@@ -101,7 +101,7 @@ impl Packed<PlaceElem> {
         let alignment = self.alignment(styles);
 
         if float
-            && alignment.map_or(false, |align| {
+            && alignment.is_custom_and(|align| {
                 matches!(align.y(), None | Some(VAlignment::Horizon))
             })
         {
diff --git a/crates/typst/src/math/spacing.rs b/crates/typst/src/math/spacing.rs
index 1e8090168..6f3dc8ccc 100644
--- a/crates/typst/src/math/spacing.rs
+++ b/crates/typst/src/math/spacing.rs
@@ -31,8 +31,7 @@ pub(super) fn spacing(
         let width = size_ref.font_size().map_or(Abs::zero(), |size| v.at(size));
         Some(SpacingFragment { width, weak: false }.into())
     };
-    let script =
-        |f: &MathFragment| f.math_size().map_or(false, |s| s <= MathSize::Script);
+    let script = |f: &MathFragment| f.math_size().is_some_and(|s| s <= MathSize::Script);
 
     match (l.class(), r.class()) {
         // No spacing before punctuation; thin spacing after punctuation, unless
diff --git a/crates/typst/src/model/bibliography.rs b/crates/typst/src/model/bibliography.rs
index ab14ab497..19fc44ea1 100644
--- a/crates/typst/src/model/bibliography.rs
+++ b/crates/typst/src/model/bibliography.rs
@@ -779,7 +779,7 @@ impl<'a> Generator<'a> {
         let citations = self.display_citations(rendered);
         let references = self.display_references(rendered);
         let hanging_indent =
-            rendered.bibliography.as_ref().map_or(false, |b| b.hanging_indent);
+            rendered.bibliography.as_ref().is_some_and(|b| b.hanging_indent);
         Ok(Works { citations, references, hanging_indent })
     }
 
diff --git a/crates/typst/src/model/outline.rs b/crates/typst/src/model/outline.rs
index 355c9c09e..cb8d55638 100644
--- a/crates/typst/src/model/outline.rs
+++ b/crates/typst/src/model/outline.rs
@@ -231,7 +231,7 @@ impl Show for Packed<OutlineElem> {
             while ancestors
                 .last()
                 .and_then(|ancestor| ancestor.with::<dyn Outlinable>())
-                .map_or(false, |last| last.level() >= *level)
+                .is_some_and(|last| last.level() >= *level)
             {
                 ancestors.pop();
             }
diff --git a/crates/typst/src/realize/behaviour.rs b/crates/typst/src/realize/behaviour.rs
index 747ce30c2..533185552 100644
--- a/crates/typst/src/realize/behaviour.rs
+++ b/crates/typst/src/realize/behaviour.rs
@@ -153,7 +153,7 @@ impl<'a> BehavedBuilder<'a> {
 
             // Store a suffix map for the next element if it has the same style
             // chain.
-            if iter.peek().map_or(false, |&(_, s2)| s == s2) {
+            if iter.peek().is_some_and(|&(_, s2)| s == s2) {
                 reuse = Some(suffix.clone());
             }
 
diff --git a/crates/typst/src/realize/mod.rs b/crates/typst/src/realize/mod.rs
index e9eaae600..5409cc253 100644
--- a/crates/typst/src/realize/mod.rs
+++ b/crates/typst/src/realize/mod.rs
@@ -161,7 +161,7 @@ impl<'a, 'v, 't> Builder<'a, 'v, 't> {
 
         let keep = content
             .to_packed::<PagebreakElem>()
-            .map_or(false, |pagebreak| !pagebreak.weak(styles));
+            .is_some_and(|pagebreak| !pagebreak.weak(styles));
 
         self.interrupt_page(keep.then_some(styles), false)?;
 
@@ -427,7 +427,7 @@ impl<'a> ParBuilder<'a> {
             || content.is::<SmartQuoteElem>()
             || content
                 .to_packed::<EquationElem>()
-                .map_or(false, |elem| !elem.block(styles))
+                .is_some_and(|elem| !elem.block(styles))
             || content.is::<BoxElem>()
         {
             self.0.push(content, styles);
diff --git a/crates/typst/src/text/deco.rs b/crates/typst/src/text/deco.rs
index 201b80a30..7f0b9e467 100644
--- a/crates/typst/src/text/deco.rs
+++ b/crates/typst/src/text/deco.rs
@@ -439,7 +439,7 @@ pub(crate) fn decorate(
 
         // Only do the costly segments intersection test if the line
         // intersects the bounding box.
-        let intersect = bbox.map_or(false, |bbox| {
+        let intersect = bbox.is_some_and(|bbox| {
             let y_min = -text.font.to_em(bbox.y_max).at(text.size);
             let y_max = -text.font.to_em(bbox.y_min).at(text.size);
             offset >= y_min && offset <= y_max
diff --git a/crates/typst/src/text/mod.rs b/crates/typst/src/text/mod.rs
index eab010666..13049b12b 100644
--- a/crates/typst/src/text/mod.rs
+++ b/crates/typst/src/text/mod.rs
@@ -952,7 +952,7 @@ cast! {
     TextDir,
     self => self.0.into_value(),
     v: Smart<Dir> => {
-        if v.map_or(false, |dir| dir.axis() == Axis::Y) {
+        if v.is_custom_and(|dir| dir.axis() == Axis::Y) {
             bail!("text direction must be horizontal");
         }
         Self(v)
diff --git a/crates/typst/src/util/mod.rs b/crates/typst/src/util/mod.rs
index 3a81bf553..802399fb8 100644
--- a/crates/typst/src/util/mod.rs
+++ b/crates/typst/src/util/mod.rs
@@ -152,7 +152,7 @@ pub fn option_eq<L, R>(left: Option<L>, other: R) -> bool
 where
     L: PartialEq<R>,
 {
-    left.map_or(false, |v| v == other)
+    left.is_some_and(|v| v == other)
 }
 
 /// A container around a static reference that is cheap to clone and hash.
diff --git a/docs/src/lib.rs b/docs/src/lib.rs
index 0bb9fc86b..9ec5b087d 100644
--- a/docs/src/lib.rs
+++ b/docs/src/lib.rs
@@ -351,7 +351,7 @@ fn func_model(
 
     let mut self_ = false;
     let mut params = func.params().unwrap();
-    if params.first().map_or(false, |first| first.name == "self") {
+    if params.first().is_some_and(|first| first.name == "self") {
         self_ = true;
         params = &params[1..];
     }
diff --git a/docs/src/link.rs b/docs/src/link.rs
index f4d803c37..537dee77a 100644
--- a/docs/src/link.rs
+++ b/docs/src/link.rs
@@ -95,7 +95,7 @@ fn resolve_definition(head: &str, base: &str) -> StrResult<String> {
         } else if value
             .clone()
             .cast::<Func>()
-            .map_or(false, |func| func.param(next).is_some())
+            .is_ok_and(|func| func.param(next).is_some())
         {
             route.push_str("#parameters-");
             route.push_str(next);
diff --git a/tests/src/tests.rs b/tests/src/tests.rs
index 2be5bc180..4c3975bbb 100644
--- a/tests/src/tests.rs
+++ b/tests/src/tests.rs
@@ -805,7 +805,7 @@ fn test_diagnostics<'a>(
     let mut actual_diagnostics = HashSet::new();
     for diagnostic in diagnostics {
         // Ignore diagnostics from other files.
-        if diagnostic.span.id().map_or(false, |id| id != source.id()) {
+        if diagnostic.span.id().is_some_and(|id| id != source.id()) {
             continue;
         }