Index retrieval fix

2 files changed, 12 insertions, 2 deletions

diff --git a/crates/ide_assists/src/lib.rs b/crates/ide_assists/src/lib.rs
index 723531078..2e0c58504 100644
--- a/crates/ide_assists/src/lib.rs
+++ b/crates/ide_assists/src/lib.rs
@@ -102,7 +102,7 @@ pub enum AssistResolveStrategy {
     None,
     /// All assists should be resolved.
     All,
-    /// Only a certain assists should be resolved.
+    /// Only a certain assist should be resolved.
     Single(SingleResolve),
 }
 
diff --git a/crates/rust-analyzer/src/handlers.rs b/crates/rust-analyzer/src/handlers.rs
index 77faf7579..0fd03bbaa 100644
--- a/crates/rust-analyzer/src/handlers.rs
+++ b/crates/rust-analyzer/src/handlers.rs
@@ -1076,7 +1076,17 @@ pub(crate) fn handle_code_action_resolve(
         frange,
     )?;
 
-    let assist = &assists[params.index];
+    let assist = match assists.get(params.index) {
+        Some(assist) => assist,
+        None => return Err(LspError::new(
+            ErrorCode::InvalidParams as i32,
+            format!(
+                "Failed to find the assist for index {} provided by the resolve request. Expected assist id: {:?}",
+                params.index, params.id,
+            ),
+        )
+        .into())
+    };
     if assist.id.0 != params.id || assist.id.1 != assist_kind {
         return Err(LspError::new(
             ErrorCode::InvalidParams as i32,