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-rw-r--r--tvix/eval/src/opcode.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/tvix/eval/src/opcode.rs b/tvix/eval/src/opcode.rs
index b072febd42fb..4cf4f695b0c7 100644
--- a/tvix/eval/src/opcode.rs
+++ b/tvix/eval/src/opcode.rs
@@ -7,6 +7,7 @@ pub struct ConstantIdx(pub usize);
 #[derive(Clone, Copy, Debug)]
 pub struct CodeIdx(pub usize);
 
+#[warn(variant_size_differences)]
 #[derive(Clone, Copy, Debug)]
 pub enum OpCode {
     // Push a constant onto the stack.