2 files changed, 18 insertions, 0 deletions
diff --git a/src/eval/library.rs b/src/eval/library.rs
index 13825d7e..25f715f8 100644
--- a/src/eval/library.rs
+++ b/src/eval/library.rs
@@ -103,6 +103,8 @@ pub struct LangItems {
     pub math_accent: fn(base: Content, accent: char) -> Content,
     /// A fraction in math: `x/2`.
     pub math_frac: fn(num: Content, denom: Content) -> Content,
+    /// A root in math: `√x`, `∛x` or `∜x`.
+    pub math_root: fn(index: Option<Content>, radicand: Content) -> Content,
     /// Dispatch a method on a library value.
     pub library_method: fn(
         vm: &mut Vm,
@@ -134,9 +136,12 @@ impl Hash for LangItems {
         self.strong.hash(state);
         self.emph.hash(state);
         self.raw.hash(state);
+        self.raw_languages.hash(state);
         self.link.hash(state);
         self.reference.hash(state);
+        (self.bibliography_keys as usize).hash(state);
         self.heading.hash(state);
+        self.heading_func.hash(state);
         self.list_item.hash(state);
         self.enum_item.hash(state);
         self.term_item.hash(state);
@@ -146,6 +151,8 @@ impl Hash for LangItems {
         self.math_attach.hash(state);
         self.math_accent.hash(state);
         self.math_frac.hash(state);
+        self.math_root.hash(state);
+        (self.library_method as usize).hash(state);
     }
 }
 
diff --git a/src/eval/mod.rs b/src/eval/mod.rs
index 2719c298..fe1fac3b 100644
--- a/src/eval/mod.rs
+++ b/src/eval/mod.rs
@@ -438,6 +438,7 @@ impl Eval for ast::Expr {
             Self::MathDelimited(v) => v.eval(vm).map(Value::Content),
             Self::MathAttach(v) => v.eval(vm).map(Value::Content),
             Self::MathFrac(v) => v.eval(vm).map(Value::Content),
+            Self::MathRoot(v) => v.eval(vm).map(Value::Content),
             Self::Ident(v) => v.eval(vm),
             Self::None(v) => v.eval(vm),
             Self::Auto(v) => v.eval(vm),
@@ -726,6 +727,16 @@ impl Eval for ast::MathFrac {
     }
 }
 
+impl Eval for ast::MathRoot {
+    type Output = Content;
+
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        let index = self.index().map(|i| (vm.items.text)(eco_format!("{i}")));
+        let radicand = self.radicand().eval_display(vm)?;
+        Ok((vm.items.math_root)(index, radicand))
+    }
+}
+
 impl Eval for ast::Ident {
     type Output = Value;