diff --git a/src/diagnostic.rs b/src/diagnostic.rs
index fc016c461..1bf9f42f7 100644
--- a/src/diagnostic.rs
+++ b/src/diagnostic.rs
@@ -4,17 +4,9 @@
 //! layout on a best effort process, generating diagnostics for incorrect
 //! things.
 
-#[cfg(feature = "serialize")]
-use serde::Serialize;
-
-use crate::syntax::SpanVec;
-
-/// A list of spanned diagnostics.
-pub type Diagnostics = SpanVec<Diagnostic>;
-
 /// A diagnostic that arose in parsing or layouting.
 #[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd)]
-#[cfg_attr(feature = "serialize", derive(Serialize))]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
 pub struct Diagnostic {
     /// How severe / important the diagnostic is.
     pub level: Level,
@@ -24,7 +16,7 @@ pub struct Diagnostic {
 
 /// How severe / important a diagnostic is.
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-#[cfg_attr(feature = "serialize", derive(Serialize))]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
 #[cfg_attr(feature = "serialize", serde(rename_all = "camelCase"))]
 pub enum Level {
     Warning,
diff --git a/src/lib.rs b/src/lib.rs
index 7681f5b78..10e1f8108 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -46,11 +46,11 @@ use std::pin::Pin;
 
 use crate::compute::scope::Scope;
 use crate::compute::value::Value;
-use crate::diagnostic::Diagnostics;
+use crate::diagnostic::Diagnostic;
 use crate::font::SharedFontLoader;
 use crate::layout::{Commands, MultiLayout};
 use crate::style::{LayoutStyle, PageStyle, TextStyle};
-use crate::syntax::{Decorations, Offset, Pos, SyntaxTree};
+use crate::syntax::{Decoration, Offset, Pos, SpanVec, SyntaxTree};
 
 /// Transforms source code into typesetted layouts.
 ///
@@ -166,9 +166,9 @@ impl Pass<Value> {
 #[derive(Debug, Default, Clone, Eq, PartialEq)]
 pub struct Feedback {
     /// Diagnostics about the source code.
-    pub diagnostics: Diagnostics,
+    pub diagnostics: SpanVec<Diagnostic>,
     /// Decorations of the source code for semantic syntax highlighting.
-    pub decorations: Decorations,
+    pub decorations: SpanVec<Decoration>,
 }
 
 impl Feedback {
diff --git a/src/syntax/decoration.rs b/src/syntax/decoration.rs
deleted file mode 100644
index fe961be39..000000000
--- a/src/syntax/decoration.rs
+++ /dev/null
@@ -1,26 +0,0 @@
-//! Decorations for semantic syntax highlighting.
-
-#[cfg(feature = "serialize")]
-use serde::Serialize;
-
-use super::span::SpanVec;
-
-/// A list of spanned decorations.
-pub type Decorations = SpanVec<Decoration>;
-
-/// Decorations for semantic syntax highlighting.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-#[cfg_attr(feature = "serialize", derive(Serialize))]
-#[cfg_attr(feature = "serialize", serde(rename_all = "camelCase"))]
-pub enum Decoration {
-    /// Text in italics.
-    Italic,
-    /// Text in bold.
-    Bold,
-    /// A valid, successfully resolved name.
-    Resolved,
-    /// An invalid, unresolved name.
-    Unresolved,
-    /// The key part of a key-value entry in a table.
-    TableKey,
-}
diff --git a/src/syntax/mod.rs b/src/syntax/mod.rs
index 1b9f8ba8f..fe887c2fe 100644
--- a/src/syntax/mod.rs
+++ b/src/syntax/mod.rs
@@ -1,11 +1,26 @@
 //! Syntax types.
 
-mod decoration;
 mod span;
 mod token;
 mod tree;
 
-pub use decoration::*;
 pub use span::*;
 pub use token::*;
 pub use tree::*;
+
+/// Decorations for semantic syntax highlighting.
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
+#[cfg_attr(feature = "serialize", serde(rename_all = "camelCase"))]
+pub enum Decoration {
+    /// Text in italics.
+    Italic,
+    /// Text in bold.
+    Bold,
+    /// A valid, successfully resolved name.
+    Resolved,
+    /// An invalid, unresolved name.
+    Unresolved,
+    /// The key part of a key-value entry in a table.
+    TableKey,
+}
diff --git a/src/syntax/span.rs b/src/syntax/span.rs
index 9357c3452..6f5420d44 100644
--- a/src/syntax/span.rs
+++ b/src/syntax/span.rs
@@ -6,9 +6,6 @@ use std::ops::{Add, Sub};
 #[cfg(test)]
 use std::cell::Cell;
 
-#[cfg(feature = "serialize")]
-use serde::Serialize;
-
 #[cfg(test)]
 thread_local! {
     static CMP_SPANS: Cell<bool> = Cell::new(true);
@@ -34,7 +31,7 @@ impl<T> Offset for SpanVec<T> {
 
 /// A value with the span it corresponds to in the source code.
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-#[cfg_attr(feature = "serialize", derive(Serialize))]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
 pub struct Spanned<T> {
     pub span: Span,
     pub v: T,
@@ -92,7 +89,7 @@ impl<T: Debug> Debug for Spanned<T> {
 
 /// Locates a slice of source code.
 #[derive(Copy, Clone, Ord, PartialOrd, Hash)]
-#[cfg_attr(feature = "serialize", derive(Serialize))]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
 pub struct Span {
     /// The inclusive start position.
     pub start: Pos,
@@ -164,7 +161,7 @@ impl Debug for Span {
 
 /// Zero-indexed line-column position in source code.
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-#[cfg_attr(feature = "serialize", derive(Serialize))]
+#[cfg_attr(feature = "serialize", derive(serde::Serialize))]
 pub struct Pos {
     /// The zero-indexed line.
     pub line: usize,
diff --git a/src/syntax/tree.rs b/src/syntax/tree.rs
index f243e67aa..8c4270e2f 100644
--- a/src/syntax/tree.rs
+++ b/src/syntax/tree.rs
@@ -2,8 +2,8 @@
 
 use std::fmt::{self, Debug, Formatter};
 
-use super::decoration::Decoration;
 use super::span::{SpanVec, Spanned};
+use super::Decoration;
 use crate::color::RgbaColor;
 use crate::compute::table::{SpannedEntry, Table};
 use crate::compute::value::{TableValue, Value};