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-rw-r--r--tvix/eval/src/builtins/mod.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index 25d00070e936..d6b52e20a2a3 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -675,6 +675,8 @@ fn builtins_set() -> NixAttrs {
         Value::String("2.3-compat-tvix-0.1".into()),
     );
 
+    map.insert("langVersion".into(), Value::Integer(6));
+
     map.insert(
         "currentSystem".into(),
         crate::systems::llvm_triple_to_nix_double(CURRENT_PLATFORM).into(),