Disallow empty labels and references (#5776) (#6332)

Co-authored-by: Laurenz <laurmaedje@gmail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/crates/typst-eval/src/markup.rs b/crates/typst-eval/src/markup.rs
index 5beefa91..9118ded5 100644
--- a/crates/typst-eval/src/markup.rs
+++ b/crates/typst-eval/src/markup.rs
@@ -205,7 +205,9 @@ impl Eval for ast::Label<'_> {
     type Output = Value;
 
     fn eval(self, _: &mut Vm) -> SourceResult<Self::Output> {
-        Ok(Value::Label(Label::new(PicoStr::intern(self.get()))))
+        Ok(Value::Label(
+            Label::new(PicoStr::intern(self.get())).expect("unexpected empty label"),
+        ))
     }
 }
 
@@ -213,7 +215,8 @@ impl Eval for ast::Ref<'_> {
     type Output = Content;
 
     fn eval(self, vm: &mut Vm) -> SourceResult<Self::Output> {
-        let target = Label::new(PicoStr::intern(self.target()));
+        let target = Label::new(PicoStr::intern(self.target()))
+            .expect("unexpected empty reference");
         let mut elem = RefElem::new(target);
         if let Some(supplement) = self.supplement() {
             elem.push_supplement(Smart::Custom(Some(Supplement::Content(