1 files changed, 7 insertions, 1 deletions
diff --git a/cli/standalone.rs b/cli/standalone.rs
index a4b55f081..48a4a28b3 100644
--- a/cli/standalone.rs
+++ b/cli/standalone.rs
@@ -201,6 +201,12 @@ pub async fn run(
 
 fn get_error_class_name(e: &AnyError) -> &'static str {
   deno_runtime::errors::get_error_class_name(e).unwrap_or_else(|| {
-    panic!("Error '{}' contains boxed error of unknown type", e);
+    panic!(
+      "Error '{}' contains boxed error of unsupported type:{}",
+      e,
+      e.chain()
+        .map(|e| format!("\n  {:?}", e))
+        .collect::<String>()
+    );
   })
 }