Fatal errors

- Makes errors fatal, so that a phase is only reached when all previous phases were error-free
- Parsing still recovers and can produce multiple errors
- Evaluation fails fast and can thus produce only a single error (except for parse errors due to an import)
- The single error that could occur during execution is removed for now
- Removes Value::Error variant

1 files changed, 8 insertions, 1 deletions

diff --git a/src/eval/template.rs b/src/eval/template.rs
index 9a71ada4..29b5663d 100644
--- a/src/eval/template.rs
+++ b/src/eval/template.rs
@@ -21,9 +21,16 @@ impl Template {
     }
 
     /// Iterate over the contained template nodes.
-    pub fn iter(&self) -> impl Iterator<Item = &TemplateNode> + '_ {
+    pub fn iter(&self) -> std::slice::Iter<TemplateNode> {
         self.nodes.iter()
     }
+
+    /// Repeat this template `n` times.
+    pub fn repeat(&self, n: usize) -> Self {
+        let len = self.nodes.len().checked_mul(n).expect("capacity overflow");
+        let nodes = self.iter().cloned().cycle().take(len).collect();
+        Self { nodes: Rc::new(nodes) }
+    }
 }
 
 impl From<TemplateTree> for Template {