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-rw-r--r--tvix/eval/src/value/mod.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/tvix/eval/src/value/mod.rs b/tvix/eval/src/value/mod.rs
index 5360f0cc7d56..2ba9ce9b50e6 100644
--- a/tvix/eval/src/value/mod.rs
+++ b/tvix/eval/src/value/mod.rs
@@ -12,6 +12,7 @@ pub use attrs::NixAttrs;
 pub use list::NixList;
 pub use string::NixString;
 
+#[warn(variant_size_differences)]
 #[derive(Clone, Debug)]
 pub enum Value {
     Null,