Allow `elem` synthesized fields to take a default value (#2687)

3 files changed, 18 insertions, 2 deletions

diff --git a/crates/typst-library/src/meta/figure.rs b/crates/typst-library/src/meta/figure.rs
index 6124e9d5..8e08b940 100644
--- a/crates/typst-library/src/meta/figure.rs
+++ b/crates/typst-library/src/meta/figure.rs
@@ -484,19 +484,23 @@ pub struct FigureCaption {
 
     /// The figure's supplement.
     #[synthesized]
+    #[default(None)]
     pub supplement: Option<Content>,
 
     /// How to number the figure.
     #[synthesized]
+    #[default(None)]
     pub numbering: Option<Numbering>,
 
     /// The counter for the figure.
     #[synthesized]
+    #[default(None)]
     pub counter: Option<Counter>,
 
     /// The figure's location.
     #[internal]
     #[synthesized]
+    #[default(None)]
     pub figure_location: Option<Location>,
 }
 
diff --git a/crates/typst-library/src/meta/footnote.rs b/crates/typst-library/src/meta/footnote.rs
index 4306f833..c7bed909 100644
--- a/crates/typst-library/src/meta/footnote.rs
+++ b/crates/typst-library/src/meta/footnote.rs
@@ -270,7 +270,12 @@ impl Show for FootnoteEntry {
         let default = StyleChain::default();
         let numbering = note.numbering(default);
         let counter = Counter::of(FootnoteElem::elem());
-        let loc = note.location().unwrap();
+        let Some(loc) = note.location() else {
+            bail!(error!(self.span(), "footnote entry must have a location").with_hint(
+                "try using a query or a show rule to customize the footnote instead"
+            ))
+        };
+
         let num = counter.at(vt, loc)?.display(vt, numbering)?;
         let sup = SuperElem::new(num)
             .pack()
diff --git a/crates/typst-library/src/meta/outline.rs b/crates/typst-library/src/meta/outline.rs
index 0cae0de4..b3b97087 100644
--- a/crates/typst-library/src/meta/outline.rs
+++ b/crates/typst-library/src/meta/outline.rs
@@ -489,7 +489,14 @@ impl Show for OutlineEntry {
 
         // In case a user constructs an outline entry with an arbitrary element.
         let Some(location) = elem.location() else {
-            bail!(self.span(), "cannot outline {}", elem.func().name())
+            if elem.can::<dyn Locatable>() && elem.can::<dyn Outlinable>() {
+                bail!(error!(self.span(), "{} must have a location", elem.func().name())
+                    .with_hint(
+                        "try using a query or a show rule to customize the outline.entry instead",
+                    ))
+            } else {
+                bail!(self.span(), "cannot outline {}", elem.func().name())
+            }
         };
 
         // The body text remains overridable.