in debug, include location information in error message on panic

Author: 0x53A

godot-core/src/private.rs

@@ -387,27 +387,39 @@ where
             // Handle panic info only in Debug mode.
             #[cfg(debug_assertions)]
             {
-                let guard = info.lock().unwrap();
-                let info = guard.as_ref().expect("no panic info available");
+                let msg = extract_panic_message(err);
+                let mut msg = format_panic_message(msg);
+
+                // try to add location information
+                if let Ok(guard) = info.lock() {
+                    if let Some(info) = guard.as_ref() {
+                        msg = format!("{}\n  at {}:{}", msg, info.file, info.line);
+                    }
+                }
+
                 if print {
                     godot_error!(
-                        "Rust function panicked at {}:{}.\n  Context: {}",
-                        info.file,
-                        info.line,
+                        "Rust function panicked: {}\n  Context: {}",
+                        msg,
                         error_context()
                     );
                     //eprintln!("Backtrace:\n{}", info.backtrace);
                 }
+
+                Err(msg)
             }
 
-            let msg = extract_panic_message(err);
-            let msg = format_panic_message(msg);
+            #[cfg(not(debug_assertions))]
+            {
+                let msg = extract_panic_message(err);
+                let msg = format_panic_message(msg);
+
+                if print {
+                    godot_error!("{msg}");
+                }
 
-            if print {
-                godot_error!("{msg}");
+                Err(msg)
             }
-
-            Err(msg)
         }
     }
 }

itest/rust/src/object_tests/dynamic_call_test.rs

@@ -148,13 +148,21 @@ fn dynamic_call_with_panic() {
 
     assert_eq!(call_error.class_name(), Some("Object"));
     assert_eq!(call_error.method_name(), "call");
-    assert_eq!(
-        call_error.to_string(),
+
+    #[cfg(target_os = "windows")]
+    let path = "itest\\rust\\src\\object_tests\\object_test.rs";
+    #[cfg(not(target_os = "windows"))]
+    let path = "itest/rust/src/object_tests/object_test.rs";
+
+    let expected_error_message = format!(
         "godot-rust function call failed: Object::call(&\"do_panic\")\
         \n  Source: ObjPayload::do_panic()\
-        \n    Reason: [panic]  do_panic exploded"
+        \n    Reason: [panic]  do_panic exploded\
+        \n  at {path}:893"
     );
 
+    assert_eq!(call_error.to_string(), expected_error_message);
+
     obj.free();
 }