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-rw-r--r--tvix/eval/src/opcode.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/tvix/eval/src/opcode.rs b/tvix/eval/src/opcode.rs
index 7dcfea93aa..cda3fdf26b 100644
--- a/tvix/eval/src/opcode.rs
+++ b/tvix/eval/src/opcode.rs
@@ -72,4 +72,7 @@ pub enum OpCode {
 
     // Close scopes while leaving their expression value around.
     OpCloseScope(usize), // number of locals to pop
+
+    // Asserts stack top is a boolean, and true.
+    OpAssert,
 }