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-rw-r--r--tvix/eval/src/builtins/mod.rs4
1 files changed, 4 insertions, 0 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index eb24c0559f30..81d30e91c689 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -1484,6 +1484,10 @@ mod pure_builtins {
 
     #[builtin("throw")]
     async fn builtin_throw(co: GenCo, message: Value) -> Result<Value, ErrorKind> {
+        // If it's already some error, let's propagate it immediately.
+        if message.is_catchable() {
+            return Ok(message);
+        }
         // TODO(sterni): coerces to string
         // We do not care about the context here explicitly.
         Ok(Value::Catchable(CatchableErrorKind::Throw(