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-rw-r--r--tvix/eval/src/value/mod.rs7
1 files changed, 7 insertions, 0 deletions
diff --git a/tvix/eval/src/value/mod.rs b/tvix/eval/src/value/mod.rs
index df663dd34c06..e9b509834273 100644
--- a/tvix/eval/src/value/mod.rs
+++ b/tvix/eval/src/value/mod.rs
@@ -724,6 +724,13 @@ impl Value {
     gen_is!(is_attrs, Value::Attrs(_));
     gen_is!(is_catchable, Value::Catchable(_));
 
+    /// Returns `true` if the value is a [`Thunk`].
+    ///
+    /// [`Thunk`]: Value::Thunk
+    pub fn is_thunk(&self) -> bool {
+        matches!(self, Self::Thunk(..))
+    }
+
     /// Compare `self` against other using (fallible) Nix ordering semantics.
     ///
     /// The function is intended to be used from within other generator