Make user-facing "debug" representation use Debug instead of Display

23 files changed, 131 insertions, 320 deletions

diff --git a/src/color.rs b/src/color.rs
index bf4cf05a..966ab3d6 100644
--- a/src/color.rs
+++ b/src/color.rs
@@ -20,14 +20,6 @@ impl Debug for Color {
     }
 }
 
-impl Display for Color {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        match self {
-            Self::Rgba(c) => Display::fmt(c, f),
-        }
-    }
-}
-
 /// An 8-bit RGBA color.
 #[derive(Copy, Clone, Eq, PartialEq, Hash, Serialize, Deserialize)]
 pub struct RgbaColor {
@@ -104,18 +96,12 @@ impl Debug for RgbaColor {
                 f,
                 "rgba({:02}, {:02}, {:02}, {:02})",
                 self.r, self.g, self.b, self.a,
-            )
+            )?;
         } else {
-            Display::fmt(self, f)
-        }
-    }
-}
-
-impl Display for RgbaColor {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        write!(f, "#{:02x}{:02x}{:02x}", self.r, self.g, self.b)?;
-        if self.a != 255 {
-            write!(f, "{:02x}", self.a)?;
+            write!(f, "#{:02x}{:02x}{:02x}", self.r, self.g, self.b)?;
+            if self.a != 255 {
+                write!(f, "{:02x}", self.a)?;
+            }
         }
         Ok(())
     }
diff --git a/src/eval/array.rs b/src/eval/array.rs
index bae89c4b..17192cb3 100644
--- a/src/eval/array.rs
+++ b/src/eval/array.rs
@@ -1,6 +1,6 @@
 use std::cmp::Ordering;
 use std::convert::TryFrom;
-use std::fmt::{self, Debug, Display, Formatter, Write};
+use std::fmt::{self, Debug, Formatter, Write};
 use std::iter::FromIterator;
 use std::ops::{Add, AddAssign};
 use std::rc::Rc;
@@ -120,15 +120,9 @@ fn out_of_bounds(index: i64, len: i64) -> String {
 
 impl Debug for Array {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.debug_list().entries(self.0.iter()).finish()
-    }
-}
-
-impl Display for Array {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.write_char('(')?;
         for (i, value) in self.iter().enumerate() {
-            Display::fmt(value, f)?;
+            value.fmt(f)?;
             if i + 1 < self.0.len() {
                 f.write_str(", ")?;
             }
diff --git a/src/eval/dict.rs b/src/eval/dict.rs
index dfac04ed..c0ddf328 100644
--- a/src/eval/dict.rs
+++ b/src/eval/dict.rs
@@ -1,5 +1,5 @@
 use std::collections::BTreeMap;
-use std::fmt::{self, Debug, Display, Formatter, Write};
+use std::fmt::{self, Debug, Formatter, Write};
 use std::iter::FromIterator;
 use std::ops::{Add, AddAssign};
 use std::rc::Rc;
@@ -79,17 +79,11 @@ impl Dict {
 /// The missing key access error message.
 #[cold]
 fn missing_key(key: &Str) -> String {
-    format!("dictionary does not contain key: {}", key)
+    format!("dictionary does not contain key: {:?}", key)
 }
 
 impl Debug for Dict {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.debug_map().entries(self.0.iter()).finish()
-    }
-}
-
-impl Display for Dict {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.write_char('(')?;
         if self.is_empty() {
             f.write_char(':')?;
@@ -97,7 +91,7 @@ impl Display for Dict {
         for (i, (key, value)) in self.iter().enumerate() {
             f.write_str(key)?;
             f.write_str(": ")?;
-            Display::fmt(value, f)?;
+            value.fmt(f)?;
             if i + 1 < self.0.len() {
                 f.write_str(", ")?;
             }
diff --git a/src/eval/function.rs b/src/eval/function.rs
index 57364d11..c45ac7ba 100644
--- a/src/eval/function.rs
+++ b/src/eval/function.rs
@@ -1,4 +1,4 @@
-use std::fmt::{self, Debug, Display, Formatter, Write};
+use std::fmt::{self, Debug, Formatter, Write};
 use std::rc::Rc;
 
 use super::{Cast, EvalContext, Str, Value};
@@ -40,12 +40,6 @@ impl Function {
 
 impl Debug for Function {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.debug_struct("Function").field("name", &self.0.name).finish()
-    }
-}
-
-impl Display for Function {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.write_str("<function")?;
         if let Some(name) = self.name() {
             f.write_char(' ')?;
@@ -63,7 +57,7 @@ impl PartialEq for Function {
 }
 
 /// Evaluated arguments to a function.
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Clone, PartialEq)]
 pub struct Arguments {
     /// The span of the whole argument list.
     pub span: Span,
@@ -72,7 +66,7 @@ pub struct Arguments {
 }
 
 /// An argument to a function call: `12` or `draw: false`.
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Clone, PartialEq)]
 pub struct Argument {
     /// The span of the whole argument.
     pub span: Span,
@@ -192,15 +186,11 @@ impl Arguments {
     }
 }
 
-impl Display for Arguments {
+impl Debug for Arguments {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.write_char('(')?;
         for (i, arg) in self.items.iter().enumerate() {
-            if let Some(name) = &arg.name {
-                f.write_str(name)?;
-                f.write_str(": ")?;
-            }
-            Display::fmt(&arg.value.v, f)?;
+            arg.fmt(f)?;
             if i + 1 < self.items.len() {
                 f.write_str(", ")?;
             }
@@ -209,6 +199,16 @@ impl Display for Arguments {
     }
 }
 
+impl Debug for Argument {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        if let Some(name) = &self.name {
+            f.write_str(name)?;
+            f.write_str(": ")?;
+        }
+        Debug::fmt(&self.value.v, f)
+    }
+}
+
 dynamic! {
     Arguments: "arguments",
 }
diff --git a/src/eval/str.rs b/src/eval/str.rs
index 099a4363..59e0887a 100644
--- a/src/eval/str.rs
+++ b/src/eval/str.rs
@@ -1,6 +1,6 @@
 use std::borrow::Borrow;
 use std::convert::TryFrom;
-use std::fmt::{self, Debug, Display, Formatter, Write};
+use std::fmt::{self, Debug, Formatter, Write};
 use std::ops::{Add, AddAssign, Deref};
 
 use crate::diag::StrResult;
@@ -10,9 +10,9 @@ use crate::util::EcoString;
 macro_rules! format_str {
     ($($tts:tt)*) => {{
         use std::fmt::Write;
-        let mut s = $crate::util::EcoString::new();
+        let mut s = $crate::eval::Str::new();
         write!(s, $($tts)*).unwrap();
-        $crate::eval::Str::from(s)
+        s
     }};
 }
 
@@ -67,12 +67,6 @@ impl Deref for Str {
 
 impl Debug for Str {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        Debug::fmt(&self.0, f)
-    }
-}
-
-impl Display for Str {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.write_char('"')?;
         for c in self.chars() {
             match c {
@@ -103,6 +97,16 @@ impl AddAssign for Str {
     }
 }
 
+impl Write for Str {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        self.0.write_str(s)
+    }
+
+    fn write_char(&mut self, c: char) -> fmt::Result {
+        self.0.write_char(c)
+    }
+}
+
 impl AsRef<str> for Str {
     fn as_ref(&self) -> &str {
         self
diff --git a/src/eval/template.rs b/src/eval/template.rs
index f4feda40..42b35fc3 100644
--- a/src/eval/template.rs
+++ b/src/eval/template.rs
@@ -1,5 +1,5 @@
 use std::convert::TryFrom;
-use std::fmt::{self, Debug, Display, Formatter};
+use std::fmt::{self, Debug, Formatter};
 use std::mem;
 use std::ops::{Add, AddAssign};
 use std::rc::Rc;
@@ -189,12 +189,6 @@ impl Template {
 
 impl Debug for Template {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.pad("Template { .. }")
-    }
-}
-
-impl Display for Template {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad("<template>")
     }
 }
diff --git a/src/eval/value.rs b/src/eval/value.rs
index 77cb766c..a1d65a18 100644
--- a/src/eval/value.rs
+++ b/src/eval/value.rs
@@ -1,6 +1,6 @@
 use std::any::Any;
 use std::cmp::Ordering;
-use std::fmt::{self, Debug, Display, Formatter};
+use std::fmt::{self, Debug, Formatter};
 use std::rc::Rc;
 
 use super::{ops, Array, Dict, Function, Str, Template};
@@ -11,7 +11,7 @@ use crate::syntax::Spanned;
 use crate::util::EcoString;
 
 /// A computational value.
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 pub enum Value {
     /// The value that indicates the absence of a meaningful value.
     None,
@@ -89,6 +89,11 @@ impl Value {
         T::cast(self)
     }
 
+    /// Return the debug representation of the value.
+    pub fn repr(&self) -> Str {
+        format_str!("{:?}", self)
+    }
+
     /// Join the value with another value.
     pub fn join(self, rhs: Self) -> StrResult<Self> {
         ops::join(self, rhs)
@@ -101,26 +106,26 @@ impl Default for Value {
     }
 }
 
-impl Display for Value {
+impl Debug for Value {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         match self {
             Self::None => f.pad("none"),
             Self::Auto => f.pad("auto"),
-            Self::Bool(v) => Display::fmt(v, f),
-            Self::Int(v) => Display::fmt(v, f),
-            Self::Float(v) => Display::fmt(v, f),
-            Self::Length(v) => Display::fmt(v, f),
-            Self::Angle(v) => Display::fmt(v, f),
-            Self::Relative(v) => Display::fmt(v, f),
-            Self::Linear(v) => Display::fmt(v, f),
-            Self::Fractional(v) => Display::fmt(v, f),
-            Self::Color(v) => Display::fmt(v, f),
-            Self::Str(v) => Display::fmt(v, f),
-            Self::Array(v) => Display::fmt(v, f),
-            Self::Dict(v) => Display::fmt(v, f),
-            Self::Template(v) => Display::fmt(v, f),
-            Self::Func(v) => Display::fmt(v, f),
-            Self::Dyn(v) => Display::fmt(v, f),
+            Self::Bool(v) => Debug::fmt(v, f),
+            Self::Int(v) => Debug::fmt(v, f),
+            Self::Float(v) => Debug::fmt(v, f),
+            Self::Length(v) => Debug::fmt(v, f),
+            Self::Angle(v) => Debug::fmt(v, f),
+            Self::Relative(v) => Debug::fmt(v, f),
+            Self::Linear(v) => Debug::fmt(v, f),
+            Self::Fractional(v) => Debug::fmt(v, f),
+            Self::Color(v) => Debug::fmt(v, f),
+            Self::Str(v) => Debug::fmt(v, f),
+            Self::Array(v) => Debug::fmt(v, f),
+            Self::Dict(v) => Debug::fmt(v, f),
+            Self::Template(v) => Debug::fmt(v, f),
+            Self::Func(v) => Debug::fmt(v, f),
+            Self::Dyn(v) => Debug::fmt(v, f),
         }
     }
 }
@@ -186,7 +191,7 @@ impl Dynamic {
     /// Create a new instance from any value that satisifies the required bounds.
     pub fn new<T>(any: T) -> Self
     where
-        T: Type + Debug + Display + PartialEq + 'static,
+        T: Type + Debug + PartialEq + 'static,
     {
         Self(Rc::new(any))
     }
@@ -213,19 +218,13 @@ impl Debug for Dynamic {
     }
 }
 
-impl Display for Dynamic {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        Display::fmt(&self.0, f)
-    }
-}
-
 impl PartialEq for Dynamic {
     fn eq(&self, other: &Self) -> bool {
         self.0.dyn_eq(other)
     }
 }
 
-trait Bounds: Debug + Display + 'static {
+trait Bounds: Debug + 'static {
     fn as_any(&self) -> &dyn Any;
     fn dyn_eq(&self, other: &Dynamic) -> bool;
     fn dyn_type_name(&self) -> &'static str;
@@ -233,7 +232,7 @@ trait Bounds: Debug + Display + 'static {
 
 impl<T> Bounds for T
 where
-    T: Type + Debug + Display + PartialEq + 'static,
+    T: Type + Debug + PartialEq + 'static,
 {
     fn as_any(&self) -> &dyn Any {
         self
@@ -420,11 +419,11 @@ mod tests {
 
     #[track_caller]
     fn test(value: impl Into<Value>, exp: &str) {
-        assert_eq!(value.into().to_string(), exp);
+        assert_eq!(format!("{:?}", value.into()), exp);
     }
 
     #[test]
-    fn test_value_to_string() {
+    fn test_value_debug() {
         // Primitives.
         test(Value::None, "none");
         test(false, "false");
diff --git a/src/eval/walk.rs b/src/eval/walk.rs
index db9fbbde..7ffb4c05 100644
--- a/src/eval/walk.rs
+++ b/src/eval/walk.rs
@@ -1,12 +1,10 @@
-use std::fmt::Write;
 use std::rc::Rc;
 
-use super::{Eval, EvalContext, Template, Value};
+use super::{Eval, EvalContext, Str, Template, Value};
 use crate::diag::TypResult;
 use crate::geom::Gen;
 use crate::layout::{ParChild, ParNode, StackChild, StackNode};
 use crate::syntax::*;
-use crate::util::EcoString;
 
 /// Walk a syntax node and fill the currently built template.
 pub trait Walk {
@@ -38,13 +36,13 @@ impl Walk for SyntaxNode {
             Self::Enum(enum_) => enum_.walk(ctx)?,
             Self::Expr(expr) => match expr.eval(ctx)? {
                 Value::None => {}
-                Value::Int(v) => ctx.template.text(v.to_string()),
-                Value::Float(v) => ctx.template.text(v.to_string()),
+                Value::Int(v) => ctx.template.text(format_str!("{}", v)),
+                Value::Float(v) => ctx.template.text(format_str!("{}", v)),
                 Value::Str(v) => ctx.template.text(v),
                 Value::Template(v) => ctx.template += v,
                 // For values which can't be shown "naturally", we print the
                 // representation in monospace.
-                other => ctx.template.monospace(other.to_string()),
+                other => ctx.template.monospace(other.repr()),
             },
         }
         Ok(())
@@ -91,7 +89,7 @@ impl Walk for HeadingNode {
 impl Walk for ListNode {
     fn walk(&self, ctx: &mut EvalContext) -> TypResult<()> {
         let body = self.body.eval(ctx)?;
-        walk_item(ctx, '•'.into(), body);
+        walk_item(ctx, Str::from('•'), body);
         Ok(())
     }
 }
@@ -99,20 +97,19 @@ impl Walk for ListNode {
 impl Walk for EnumNode {
     fn walk(&self, ctx: &mut EvalContext) -> TypResult<()> {
         let body = self.body.eval(ctx)?;
-        let mut label = EcoString::new();
-        write!(&mut label, "{}.", self.number.unwrap_or(1)).unwrap();
+        let label = format_str!("{}.", self.number.unwrap_or(1));
         walk_item(ctx, label, body);
         Ok(())
     }
 }
 
-fn walk_item(ctx: &mut EvalContext, label: EcoString, body: Template) {
+fn walk_item(ctx: &mut EvalContext, label: Str, body: Template) {
     ctx.template += Template::from_block(move |state| {
         let label = ParNode {
             dir: state.dirs.inline,
             line_spacing: state.line_spacing(),
             children: vec![ParChild::Text(
-                label.clone(),
+                (&label).into(),
                 state.aligns.inline,
                 Rc::clone(&state.font),
                 vec![],
diff --git a/src/font.rs b/src/font.rs
index 2e935d3b..41bf9a81 100644
--- a/src/font.rs
+++ b/src/font.rs
@@ -1,7 +1,7 @@
 //! Font handling.
 
 use std::collections::{hash_map::Entry, BTreeMap, HashMap};
-use std::fmt::{self, Debug, Display, Formatter};
+use std::fmt::{self, Debug, Formatter};
 use std::path::{Path, PathBuf};
 use std::rc::Rc;
 
@@ -282,7 +282,7 @@ impl Face {
 }
 
 /// Identifies a vertical metric of a font.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub enum VerticalFontMetric {
     /// The distance from the baseline to the typographic ascender.
     ///
@@ -302,7 +302,7 @@ pub enum VerticalFontMetric {
     Descender,
 }
 
-impl Display for VerticalFontMetric {
+impl Debug for VerticalFontMetric {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad(match self {
             Self::Ascender => "ascender",
@@ -315,7 +315,7 @@ impl Display for VerticalFontMetric {
 }
 
 /// A generic or named font family.
-#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+#[derive(Clone, Eq, PartialEq, Hash)]
 pub enum FontFamily {
     /// A family that has "serifs", small strokes attached to letters.
     Serif,
@@ -327,7 +327,7 @@ pub enum FontFamily {
     Named(String),
 }
 
-impl Display for FontFamily {
+impl Debug for FontFamily {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad(match self {
             Self::Serif => "serif",
@@ -409,7 +409,7 @@ pub fn find_name(mut names: ttf_parser::Names<'_>, name_id: u16) -> Option<Strin
 }
 
 /// Properties that distinguish a face from other faces in the same family.
-#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Hash)]
+#[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
 #[derive(Serialize, Deserialize)]
 pub struct FontVariant {
     /// The style of the face (normal / italic / oblique).
@@ -427,14 +427,14 @@ impl FontVariant {
     }
 }
 
-impl Display for FontVariant {
+impl Debug for FontVariant {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        write!(f, "{}-{}-{}", self.style, self.weight, self.stretch)
+        write!(f, "{:?}-{:?}-{:?}", self.style, self.weight, self.stretch)
     }
 }
 
 /// The style of a font face.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[derive(Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case")]
 pub enum FontStyle {
@@ -446,36 +446,19 @@ pub enum FontStyle {
     Oblique,
 }
 
-impl FontStyle {
-    /// Create a font style from a lowercase name like `italic`.
-    pub fn from_str(name: &str) -> Option<FontStyle> {
-        Some(match name {
-            "normal" => Self::Normal,
-            "italic" => Self::Italic,
-            "oblique" => Self::Oblique,
-            _ => return None,
-        })
-    }
-
-    /// The lowercase string representation of this style.
-    pub fn to_str(self) -> &'static str {
-        match self {
-            Self::Normal => "normal",
-            Self::Italic => "italic",
-            Self::Oblique => "oblique",
-        }
-    }
-}
-
 impl Default for FontStyle {
     fn default() -> Self {
         Self::Normal
     }
 }
 
-impl Display for FontStyle {
+impl Debug for FontStyle {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.pad(self.to_str())
+        f.pad(match self {
+            Self::Normal => "normal",
+            Self::Italic => "italic",
+            Self::Oblique => "oblique",
+        })
     }
 }
 
@@ -519,44 +502,11 @@ impl FontWeight {
         Self(weight.max(100).min(900))
     }
 
-    /// Create a font weight from a lowercase name like `light`.
-    pub fn from_str(name: &str) -> Option<Self> {
-        Some(match name {
-            "thin" => Self::THIN,
-            "extralight" => Self::EXTRALIGHT,
-            "light" => Self::LIGHT,
-            "regular" => Self::REGULAR,
-            "medium" => Self::MEDIUM,
-            "semibold" => Self::SEMIBOLD,
-            "bold" => Self::BOLD,
-            "extrabold" => Self::EXTRABOLD,
-            "black" => Self::BLACK,
-            _ => return None,
-        })
-    }
-
     /// The number between 100 and 900.
     pub fn to_number(self) -> u16 {
         self.0
     }
 
-    /// The lowercase string representation of this weight if it is divisible by
-    /// 100.
-    pub fn to_str(self) -> Option<&'static str> {
-        Some(match self {
-            Self::THIN => "thin",
-            Self::EXTRALIGHT => "extralight",
-            Self::LIGHT => "light",
-            Self::REGULAR => "regular",
-            Self::MEDIUM => "medium",
-            Self::SEMIBOLD => "semibold",
-            Self::BOLD => "bold",
-            Self::EXTRABOLD => "extrabold",
-            Self::BLACK => "black",
-            _ => return None,
-        })
-    }
-
     /// Add (or remove) weight, saturating at the boundaries of 100 and 900.
     pub fn thicken(self, delta: i16) -> Self {
         Self((self.0 as i16).saturating_add(delta).max(100).min(900) as u16)
@@ -575,27 +525,18 @@ impl Default for FontWeight {
 }
 
 impl Debug for FontWeight {
-    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
-        f.pad(match *self {
-            Self::THIN => "Thin",
-            Self::EXTRALIGHT => "Extralight",
-            Self::LIGHT => "Light",
-            Self::REGULAR => "Regular",
-            Self::MEDIUM => "Medium",
-            Self::SEMIBOLD => "Semibold",
-            Self::BOLD => "Bold",
-            Self::EXTRABOLD => "Extrabold",
-            Self::BLACK => "Black",
-            _ => return write!(f, "{}", self.0),
-        })
-    }
-}
-
-impl Display for FontWeight {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        match self.to_str() {
-            Some(name) => f.pad(name),
-            None => write!(f, "{}", self.0),
+        match *self {
+            Self::THIN => f.pad("thin"),
+            Self::EXTRALIGHT => f.pad("extralight"),
+            Self::LIGHT => f.pad("light"),
+            Self::REGULAR => f.pad("regular"),
+            Self::MEDIUM => f.pad("medium"),
+            Self::SEMIBOLD => f.pad("semibold"),
+            Self::BOLD => f.pad("bold"),
+            Self::EXTRABOLD => f.pad("extrabold"),
+            Self::BLACK => f.pad("black"),
+            _ => write!(f, "{}", self.0),
         }
     }
 }
@@ -656,44 +597,11 @@ impl FontStretch {
         }
     }
 
-    /// Create a font stretch from a lowercase name like `extra-expanded`.
-    pub fn from_str(name: &str) -> Option<Self> {
-        Some(match name {
-            "ultra-condensed" => Self::ULTRA_CONDENSED,
-            "extra-condensed" => Self::EXTRA_CONDENSED,
-            "condensed" => Self::CONDENSED,
-            "semi-condensed" => Self::SEMI_CONDENSED,
-            "normal" => Self::NORMAL,
-            "semi-expanded" => Self::SEMI_EXPANDED,
-            "expanded" => Self::EXPANDED,
-            "extra-expanded" => Self::EXTRA_EXPANDED,
-            "ultra-expanded" => Self::ULTRA_EXPANDED,
-            _ => return None,
-        })
-    }
-
     /// The ratio between 0.5 and 2.0 corresponding to this stretch.
     pub fn to_ratio(self) -> f32 {
         self.0 as f32 / 1000.0
     }
 
-    /// The lowercase string representation of this stretch is one of the named
-    /// ones.
-    pub fn to_str(self) -> Option<&'static str> {
-        Some(match self {
-            Self::ULTRA_CONDENSED => "ultra-condensed",
-            Self::EXTRA_CONDENSED => "extra-condensed",
-            Self::CONDENSED => "condensed",
-            Self::SEMI_CONDENSED => "semi-condensed",
-            Self::NORMAL => "normal",
-            Self::SEMI_EXPANDED => "semi-expanded",
-            Self::EXPANDED => "expanded",
-            Self::EXTRA_EXPANDED => "extra-expanded",
-            Self::ULTRA_EXPANDED => "ultra-expanded",
-            _ => return None,
-        })
-    }
-
     /// The absolute ratio distance between this and another font stretch.
     pub fn distance(self, other: Self) -> f32 {
         (self.to_ratio() - other.to_ratio()).abs()
@@ -708,26 +616,17 @@ impl Default for FontStretch {
 
 impl Debug for FontStretch {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.pad(match *self {
-            s if s == Self::ULTRA_CONDENSED => "UltraCondensed",
-            s if s == Self::EXTRA_CONDENSED => "ExtraCondensed",
-            s if s == Self::CONDENSED => "Condensed",
-            s if s == Self::SEMI_CONDENSED => "SemiCondensed",
-            s if s == Self::NORMAL => "Normal",
-            s if s == Self::SEMI_EXPANDED => "SemiExpanded",
-            s if s == Self::EXPANDED => "Expanded",
-            s if s == Self::EXTRA_EXPANDED => "ExtraExpanded",
-            s if s == Self::ULTRA_EXPANDED => "UltraExpanded",
-            _ => return write!(f, "{}", self.0),
-        })
-    }
-}
-
-impl Display for FontStretch {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        match self.to_str() {
-            Some(name) => f.pad(name),
-            None => write!(f, "{}", self.to_ratio()),
+        match *self {
+            Self::ULTRA_CONDENSED => f.pad("ultra-condensed"),
+            Self::EXTRA_CONDENSED => f.pad("extra-condensed"),
+            Self::CONDENSED => f.pad("condensed"),
+            Self::SEMI_CONDENSED => f.pad("semi-condensed"),
+            Self::NORMAL => f.pad("normal"),
+            Self::SEMI_EXPANDED => f.pad("semi-expanded"),
+            Self::EXPANDED => f.pad("expanded"),
+            Self::EXTRA_EXPANDED => f.pad("extra-expanded"),
+            Self::ULTRA_EXPANDED => f.pad("ultra-expanded"),
+            _ => write!(f, "{}", self.to_ratio()),
         }
     }
 }
diff --git a/src/geom/align.rs b/src/geom/align.rs
index d83c00b0..59960084 100644
--- a/src/geom/align.rs
+++ b/src/geom/align.rs
@@ -1,7 +1,7 @@
 use super::*;
 
 /// Where to align something along an axis.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub enum Align {
     /// Align at the start of the axis.
     Start,
@@ -81,7 +81,7 @@ impl Default for Align {
     }
 }
 
-impl Display for Align {
+impl Debug for Align {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad(match self {
             Self::Start => "start",
diff --git a/src/geom/angle.rs b/src/geom/angle.rs
index b6fa3f41..929a96fe 100644
--- a/src/geom/angle.rs
+++ b/src/geom/angle.rs
@@ -59,13 +59,6 @@ impl Angle {
 
 impl Debug for Angle {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        let unit = AngularUnit::Deg;
-        write!(f, "{}{}", self.to_unit(unit), unit)
-    }
-}
-
-impl Display for Angle {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         // Format with the unit that yields the shortest output, preferring
         // degrees when tied.
         let unit = [AngularUnit::Deg, AngularUnit::Rad]
@@ -74,7 +67,7 @@ impl Display for Angle {
             .min_by_key(|&unit| self.to_unit(unit).to_string().len())
             .unwrap();
 
-        write!(f, "{}{}", self.to_unit(unit), unit)
+        write!(f, "{}{:?}", self.to_unit(unit), unit)
     }
 }
 
@@ -139,7 +132,7 @@ impl Sum for Angle {
     }
 }
 /// Different units of angular measurement.
-#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq)]
 pub enum AngularUnit {
     /// Radians.
     Rad,
@@ -157,7 +150,7 @@ impl AngularUnit {
     }
 }
 
-impl Display for AngularUnit {
+impl Debug for AngularUnit {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad(match self {
             Self::Rad => "rad",
diff --git a/src/geom/dir.rs b/src/geom/dir.rs
index 7b224b55..d95c7eb9 100644
--- a/src/geom/dir.rs
+++ b/src/geom/dir.rs
@@ -1,7 +1,7 @@
 use super::*;
 
 /// The four directions into which content can be laid out.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash)]
 pub enum Dir {
     /// Left to right.
     LTR,
@@ -71,7 +71,7 @@ impl Dir {
     }
 }
 
-impl Display for Dir {
+impl Debug for Dir {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad(match self {
             Self::LTR => "ltr",
diff --git a/src/geom/em.rs b/src/geom/em.rs
index 45e5ba60..6d2f3aca 100644
--- a/src/geom/em.rs
+++ b/src/geom/em.rs
@@ -46,12 +46,6 @@ impl Em {
 
 impl Debug for Em {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        Display::fmt(self, f)
-    }
-}
-
-impl Display for Em {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         write!(f, "{}em", self.get())
     }
 }
diff --git a/src/geom/fr.rs b/src/geom/fr.rs
index 5f3e5534..c16a4d03 100644
--- a/src/geom/fr.rs
+++ b/src/geom/fr.rs
@@ -38,12 +38,6 @@ impl Fractional {
 
 impl Debug for Fractional {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        Display::fmt(self, f)
-    }
-}
-
-impl Display for Fractional {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         write!(f, "{}fr", self.get())
     }
 }
diff --git a/src/geom/gen.rs b/src/geom/gen.rs
index 1b42968a..18801460 100644
--- a/src/geom/gen.rs
+++ b/src/geom/gen.rs
@@ -115,12 +115,3 @@ impl GenAxis {
         }
     }
 }
-
-impl Display for GenAxis {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.pad(match self {
-            Self::Inline => "inline",
-            Self::Block => "block",
-        })
-    }
-}
diff --git a/src/geom/length.rs b/src/geom/length.rs
index b9eb7b75..d0f11bd2 100644
--- a/src/geom/length.rs
+++ b/src/geom/length.rs
@@ -130,13 +130,6 @@ impl Length {
 
 impl Debug for Length {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        let unit = LengthUnit::Pt;
-        write!(f, "{}{}", self.to_unit(unit), unit)
-    }
-}
-
-impl Display for Length {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         use LengthUnit::*;
 
         // Format with the unit that yields the shortest output, preferring
@@ -147,7 +140,7 @@ impl Display for Length {
             .min_by_key(|&unit| self.to_unit(unit).to_string().len())
             .unwrap();
 
-        write!(f, "{}{}", self.to_unit(unit), unit)
+        write!(f, "{}{:?}", self.to_unit(unit), unit)
     }
 }
 
@@ -219,7 +212,7 @@ impl<'a> Sum<&'a Length> for Length {
 }
 
 /// Different units of length measurement.
-#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+#[derive(Copy, Clone, Eq, PartialEq)]
 pub enum LengthUnit {
     /// Points.
     Pt,
@@ -243,7 +236,7 @@ impl LengthUnit {
     }
 }
 
-impl Display for LengthUnit {
+impl Debug for LengthUnit {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         f.pad(match self {
             LengthUnit::Mm => "mm",
@@ -265,9 +258,9 @@ mod tests {
 
     #[test]
     fn test_length_formatting() {
-        assert_eq!(Length::pt(23.0).to_string(), "23pt");
-        assert_eq!(Length::pt(-28.3465).to_string(), "-1cm");
-        assert_eq!(Length::cm(12.728).to_string(), "12.728cm");
-        assert_eq!(Length::cm(4.5).to_string(), "45mm");
+        assert_eq!(format!("{:?}", Length::pt(23.0)), "23pt");
+        assert_eq!(format!("{:?}", Length::pt(-28.3465)), "-1cm");
+        assert_eq!(format!("{:?}", Length::cm(12.728)), "12.728cm");
+        assert_eq!(format!("{:?}", Length::cm(4.5)), "45mm");
     }
 }
diff --git a/src/geom/linear.rs b/src/geom/linear.rs
index 6a20b826..494007b0 100644
--- a/src/geom/linear.rs
+++ b/src/geom/linear.rs
@@ -53,12 +53,6 @@ impl Debug for Linear {
     }
 }
 
-impl Display for Linear {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        write!(f, "{} + {}", self.rel, self.abs)
-    }
-}
-
 impl From<Length> for Linear {
     fn from(abs: Length) -> Self {
         Self { rel: Relative::zero(), abs }
diff --git a/src/geom/mod.rs b/src/geom/mod.rs
index 11e082b8..936f1868 100644
--- a/src/geom/mod.rs
+++ b/src/geom/mod.rs
@@ -33,7 +33,7 @@ pub use size::*;
 pub use spec::*;
 
 use std::f64::consts::PI;
-use std::fmt::{self, Debug, Display, Formatter};
+use std::fmt::{self, Debug, Formatter};
 use std::iter::Sum;
 use std::ops::*;
 
diff --git a/src/geom/relative.rs b/src/geom/relative.rs
index 9122af84..c2d0a0cb 100644
--- a/src/geom/relative.rs
+++ b/src/geom/relative.rs
@@ -51,12 +51,6 @@ impl Relative {
 
 impl Debug for Relative {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        Display::fmt(self, f)
-    }
-}
-
-impl Display for Relative {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         write!(f, "{}%", 100.0 * self.get())
     }
 }
diff --git a/src/geom/spec.rs b/src/geom/spec.rs
index 3b8b4dd6..a6235548 100644
--- a/src/geom/spec.rs
+++ b/src/geom/spec.rs
@@ -128,12 +128,3 @@ impl SpecAxis {
         }
     }
 }
-
-impl Display for SpecAxis {
-    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        f.pad(match self {
-            Self::Horizontal => "horizontal",
-            Self::Vertical => "vertical",
-        })
-    }
-}
diff --git a/src/library/utility.rs b/src/library/utility.rs
index 19dfc3ec..d757a7f9 100644
--- a/src/library/utility.rs
+++ b/src/library/utility.rs
@@ -12,7 +12,7 @@ pub fn type_(_: &mut EvalContext, args: &mut Arguments) -> TypResult<Value> {
 
 /// `repr`: The string representation of a value.
 pub fn repr(_: &mut EvalContext, args: &mut Arguments) -> TypResult<Value> {
-    Ok(args.expect::<Value>("value")?.to_string().into())
+    Ok(args.expect::<Value>("value")?.repr().into())
 }
 
 /// `join`: Join a sequence of values, optionally interspersing it with another
diff --git a/src/syntax/pretty.rs b/src/syntax/pretty.rs
index 3c59914f..39f0676b 100644
--- a/src/syntax/pretty.rs
+++ b/src/syntax/pretty.rs
@@ -223,8 +223,8 @@ impl Pretty for Lit {
             Self::Bool(_, v) => write!(p, "{}", v).unwrap(),
             Self::Int(_, v) => write!(p, "{}", v).unwrap(),
             Self::Float(_, v) => write!(p, "{}", v).unwrap(),
-            Self::Length(_, v, u) => write!(p, "{}{}", v, u).unwrap(),
-            Self::Angle(_, v, u) => write!(p, "{}{}", v, u).unwrap(),
+            Self::Length(_, v, u) => write!(p, "{}{:?}", v, u).unwrap(),
+            Self::Angle(_, v, u) => write!(p, "{}{:?}", v, u).unwrap(),
             Self::Percent(_, v) => write!(p, "{}%", v).unwrap(),
             Self::Fractional(_, v) => write!(p, "{}fr", v).unwrap(),
             Self::Str(_, v) => write!(p, "{:?}", v).unwrap(),
diff --git a/tests/typeset.rs b/tests/typeset.rs
index 41f12f2e..83b43ce0 100644
--- a/tests/typeset.rs
+++ b/tests/typeset.rs
@@ -388,7 +388,7 @@ fn draw(ctx: &Context, frames: &[Rc<Frame>], dpp: f32) -> sk::Pixmap {
     let pixel_height = (dpp * height.to_pt() as f32) as u32;
     if pixel_width > 4000 || pixel_height > 4000 {
         panic!(
-            "overlarge image: {} by {} ({} x {})",
+            "overlarge image: {} by {} ({:?} x {:?})",
             pixel_width, pixel_height, width, height,
         );
     }