Let the system fail with error messages

The system result handling will pass the string representation of the
error to the panic macro.

src/error.rs

@@ -34,7 +34,7 @@ pub fn handle_system_result<F>(mut f: F)
 where
     F: FnMut() -> anyhow::Result<()>,
 {
-    if let Err(_) = f() {
-        panic!();
+    if let Err(err) = f() {
+        panic!(err.to_string());
     }
 }