From baed8cd4dfaf5789d2beef81e0c5b5272c402030 Mon Sep 17 00:00:00 2001
From: Riccardo Strina <riccardo.strina@icloud.com>
Date: Sat, 7 Nov 2026 09:40:35 +0100
Subject: [PATCH 1/2] Assign default value to debugger LSP struct

- Errors reported by the debugger could be missing
  the data field, breaking the expected contract from
  Zed during deserialization. Now errors are correctly
  reported instead of failing during deserialization.
---
 src/lsp.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lsp.rs b/src/lsp.rs
index 8a78a56..07483af 100644
--- a/src/lsp.rs
+++ b/src/lsp.rs
@@ -104,6 +104,7 @@ pub enum LspResponse<T> {
 pub struct LspError {
     code: i64,
     message: String,
+    #[serde(default)]
     data: Value,
 }
 

From bcf5e8c1e9a838f7f16d222d4dc139caa7f7c310 Mon Sep 17 00:00:00 2001
From: Riccardo Strina <riccardo.strina@icloud.com>
Date: Sat, 7 Nov 2026 14:28:13 +0100
Subject: [PATCH 2/2] Add unit test to verify serde dafault

---
 src/lsp.rs | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/src/lsp.rs b/src/lsp.rs
index 07483af..f2a7eed 100644
--- a/src/lsp.rs
+++ b/src/lsp.rs
@@ -115,3 +115,33 @@ pub struct MainClassEntry {
     pub project_name: String,
     pub file_path: String,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn error_response_without_data_defaults_to_null() {
+        let response: LspResponse<Vec<MainClassEntry>> = serde_json::from_str(
+            r#"{
+                "jsonrpc": "2.0",
+                "id": "proxy-http-1",
+                "error": {
+                    "code": -32601,
+                    "message": "No delegateCommandHandler for vscode.java.resolveMainClass"
+                }
+            }"#,
+        )
+        .expect("an LSP error response may omit data");
+
+        let LspResponse::Error { error } = response else {
+            panic!("expected an LSP error response");
+        };
+        assert_eq!(error.data, Value::Null);
+        assert_eq!(error.code, -32601);
+        assert_eq!(
+            error.message,
+            "No delegateCommandHandler for vscode.java.resolveMainClass"
+        );
+    }
+}