diff options
| -rw-r--r-- | tvix/eval/src/builtins/mod.rs | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs index d0ed834a9e..947854e6f0 100644 --- a/tvix/eval/src/builtins/mod.rs +++ b/tvix/eval/src/builtins/mod.rs @@ -45,7 +45,10 @@ fn pure_builtins() -> Vec<Builtin> { let a = args.pop().unwrap(); arithmetic_op!(a, b, /) }), - Builtin::new("length", 1, |args, _| { + Builtin::new("length", 1, |args, vm| { + if let Value::Thunk(t) = &args[0] { + t.force(vm)?; + } Ok(Value::Integer(args[0].to_list()?.len() as i64)) }), Builtin::new("isAttrs", 1, |args, _| { |