diff --git a/cmds/jrsonnet/Cargo.toml b/cmds/jrsonnet/Cargo.toml
index cdf89637..ef0355b1 100644
--- a/cmds/jrsonnet/Cargo.toml
+++ b/cmds/jrsonnet/Cargo.toml
@@ -15,6 +15,7 @@ experimental = [
     "exp-object-iteration",
     "exp-bigint",
     "exp-apply",
+    "exp-regex",
 ]
 # Use mimalloc as allocator
 mimalloc = ["mimallocator"]
diff --git a/crates/jrsonnet-evaluator/src/evaluate/mod.rs b/crates/jrsonnet-evaluator/src/evaluate/mod.rs
index 127f287c..d9c53db0 100644
--- a/crates/jrsonnet-evaluator/src/evaluate/mod.rs
+++ b/crates/jrsonnet-evaluator/src/evaluate/mod.rs
@@ -596,10 +596,24 @@ pub fn evaluate(ctx: Context, expr: &LocExpr) -> Result<Val> {
 		ArrComp(expr, comp_specs) => {
 			let mut out = Vec::new();
 			evaluate_comp(ctx, comp_specs, &mut |ctx| {
-				out.push(evaluate(ctx, expr)?);
+				#[derive(Trace)]
+				struct EvaluateThunk {
+					ctx: Context,
+					expr: LocExpr,
+				}
+				impl ThunkValue for EvaluateThunk {
+					type Output = Val;
+					fn get(self: Box<Self>) -> Result<Val> {
+						evaluate(self.ctx, &self.expr)
+					}
+				}
+				out.push(Thunk::new(EvaluateThunk {
+					ctx,
+					expr: expr.clone(),
+				}));
 				Ok(())
 			})?;
-			Val::Arr(ArrValue::eager(out))
+			Val::Arr(ArrValue::lazy(out))
 		}
 		Obj(body) => Val::Obj(evaluate_object(ctx, body)?),
 		ObjExtend(a, b) => evaluate_add_op(