From f3ead9c6a7184d2b592f018795f73d34399a9c83 Mon Sep 17 00:00:00 2001
From: Bert Belder <bertbelder@gmail.com>
Date: Fri, 8 Jan 2021 16:57:37 -0800
Subject: refactor: Print cause chain when downcasting AnyError fails (#9059)

---
 cli/errors.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'cli/errors.rs')

diff --git a/cli/errors.rs b/cli/errors.rs
index 29fd428c8..b631f1b71 100644
--- a/cli/errors.rs
+++ b/cli/errors.rs
@@ -32,6 +32,12 @@ pub(crate) fn get_error_class_name(e: &AnyError) -> &'static str {
         .map(get_diagnostic_class)
     })
     .unwrap_or_else(|| {
-      panic!("Error '{}' contains boxed error of unknown type", e);
+      panic!(
+        "Error '{}' contains boxed error of unknown type:{}",
+        e,
+        e.chain()
+          .map(|e| format!("\n  {:?}", e))
+          .collect::<String>()
+      );
     })
 }
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