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-rw-r--r--tvix/eval/src/builtins/mod.rs5
1 files changed, 5 insertions, 0 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index 1a6155a82352..872033648aff 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -234,6 +234,11 @@ fn pure_builtins() -> Vec<Builtin> {
                 .collect::<Vec<Value>>();
             Ok(Value::List(NixList::construct(parts.len(), parts)))
         }),
+        Builtin::new("stringLength", &[false], |args, vm| {
+            // also forces the value
+            let s = args[0].coerce_to_string(CoercionKind::Weak, vm)?;
+            Ok(Value::Integer(s.as_str().len() as i64))
+        }),
         Builtin::new(
             "sub",
             &[false, false],