Capture variables in templates 🔍

1 files changed, 7 insertions, 0 deletions

diff --git a/src/syntax/expr.rs b/src/syntax/expr.rs
index 15c53cc0..ca55bdd0 100644
--- a/src/syntax/expr.rs
+++ b/src/syntax/expr.rs
@@ -1,5 +1,6 @@
 use super::*;
 use crate::color::RgbaColor;
+use crate::eval::Value;
 use crate::geom::{AngularUnit, LengthUnit};
 
 /// An expression.
@@ -50,6 +51,11 @@ pub enum Expr {
     If(ExprIf),
     /// A for expression: `#for x #in y { z }`.
     For(ExprFor),
+    /// A captured value.
+    ///
+    /// This node is never created by parsing. It only results from an in-place
+    /// transformation of an identifier to a captured value.
+    CapturedValue(Value),
 }
 
 impl Pretty for Expr {
@@ -86,6 +92,7 @@ impl Pretty for Expr {
             Self::Let(v) => v.pretty(p),
             Self::If(v) => v.pretty(p),
             Self::For(v) => v.pretty(p),
+            Self::CapturedValue(v) => v.pretty(p),
         }
     }
 }