diff --git a/src/twopass.rs b/src/twopass.rs
index 846c66b..5acd9c2 100644
--- a/src/twopass.rs
+++ b/src/twopass.rs
@@ -324,7 +324,15 @@ impl Eval for Call {
 
 impl Eval for Function {
 	fn eval(&self, ctx: &RunContext) -> types::Value {
-		todo!()
+		let upvalues: Vec<_> = self
+			.upvalues
+			.iter()
+			.map(|(_name, id)| ctx.var(*id))
+			.collect();
+		let self_ = self.clone(); // TODO reference, somehow
+		Some(
+			types::Function::new(self.name.clone(), move |args| self_.call(&upvalues, args)).into(),
+		)
 	}
 }