3 files changed, 39 insertions, 13 deletions
diff --git a/library/src/compute/construct.rs b/library/src/compute/construct.rs
index 3b42ef24..b6f2de8f 100644
--- a/library/src/compute/construct.rs
+++ b/library/src/compute/construct.rs
@@ -1,5 +1,6 @@
 use std::str::FromStr;
 
+use ecow::EcoVec;
 use typst::model::Regex;
 
 use crate::prelude::*;
@@ -275,7 +276,7 @@ castable! {
 /// construct
 #[func]
 pub fn symbol(args: &mut Args) -> SourceResult<Value> {
-    let mut list: Vec<(EcoString, char)> = vec![];
+    let mut list = EcoVec::new();
     for Spanned { v, span } in args.all::<Spanned<Variant>>()? {
         if list.iter().any(|(prev, _)| &v.0 == prev) {
             bail!(span, "duplicate variant");
@@ -458,12 +459,12 @@ pub fn range(args: &mut Args) -> SourceResult<Value> {
     };
 
     let mut x = start;
-    let mut seq = vec![];
+    let mut array = Array::new();
 
     while x.cmp(&end) == 0.cmp(&step) {
-        seq.push(Value::Int(x));
+        array.push(Value::Int(x));
         x += step;
     }
 
-    Ok(Value::Array(Array::from_vec(seq)))
+    Ok(Value::Array(array))
 }
diff --git a/library/src/compute/data.rs b/library/src/compute/data.rs
index 5c0d4e64..c604be11 100644
--- a/library/src/compute/data.rs
+++ b/library/src/compute/data.rs
@@ -86,15 +86,15 @@ pub fn csv(vm: &Vm, args: &mut Args) -> SourceResult<Value> {
     }
 
     let mut reader = builder.from_reader(data.as_slice());
-    let mut vec = vec![];
+    let mut array = Array::new();
 
     for result in reader.records() {
         let row = result.map_err(format_csv_error).at(span)?;
-        let array = row.iter().map(|field| Value::Str(field.into())).collect();
-        vec.push(Value::Array(array))
+        let sub = row.iter().map(|field| Value::Str(field.into())).collect();
+        array.push(Value::Array(sub))
     }
 
-    Ok(Value::Array(Array::from_vec(vec)))
+    Ok(Value::Array(array))
 }
 
 /// The delimiter to use when parsing CSV files.
diff --git a/library/src/compute/foundations.rs b/library/src/compute/foundations.rs
index 82270dd3..f17af219 100644
--- a/library/src/compute/foundations.rs
+++ b/library/src/compute/foundations.rs
@@ -56,6 +56,29 @@ pub fn repr(args: &mut Args) -> SourceResult<Value> {
     Ok(args.expect::<Value>("value")?.repr().into())
 }
 
+/// # Panic
+/// Fail with an error.
+///
+/// ## Example
+/// The code below produces the error `panicked at: "this is wrong"`.
+/// ```typ
+/// #panic("this is wrong")
+/// ```
+///
+/// ## Parameters
+/// - payload: `Value` (positional)
+///   The value (or message) to panic with.
+///
+/// ## Category
+/// foundations
+#[func]
+pub fn panic(args: &mut Args) -> SourceResult<Value> {
+    match args.eat::<Value>()? {
+        Some(v) => bail!(args.span, "panicked with: {}", v.repr()),
+        None => bail!(args.span, "panicked"),
+    }
+}
+
 /// # Assert
 /// Ensure that a condition is fulfilled.
 ///
@@ -64,24 +87,26 @@ pub fn repr(args: &mut Args) -> SourceResult<Value> {
 ///
 /// ## Example
 /// ```example
-/// #assert(1 < 2)
+/// #assert(1 < 2, message: "one is")
 /// ```
 ///
 /// ## Parameters
 /// - condition: `bool` (positional, required)
 ///   The condition that must be true for the assertion to pass.
+/// - message: `EcoString` (named)
+///   The error message when the assertion fails.
 ///
 /// ## Category
 /// foundations
 #[func]
 pub fn assert(args: &mut Args) -> SourceResult<Value> {
-    let Spanned { v, span } = args.expect::<Spanned<bool>>("condition")?;
+    let check = args.expect::<bool>("condition")?;
     let message = args.named::<EcoString>("message")?;
-    if !v {
+    if !check {
         if let Some(message) = message {
-            bail!(span, "assertion failed: {}", message);
+            bail!(args.span, "assertion failed: {}", message);
         } else {
-            bail!(span, "assertion failed");
+            bail!(args.span, "assertion failed");
         }
     }
     Ok(Value::None)