5 files changed, 40 insertions, 6 deletions

diff --git a/crates/ide/.DS_Store b/crates/ide/.DS_Store
new file mode 100644
index 000000000..a566736aa
--- /dev/null
+++ b/crates/ide/.DS_Store
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 74a021dbf..372180ab5 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -398,13 +398,10 @@ impl Config {
             }
 
             if let Some(code_action) = &doc_caps.code_action {
-                match (code_action.data_support, &code_action.resolve_support) {
-                    (Some(true), Some(resolve_support)) => {
-                        if resolve_support.properties.iter().any(|it| it == "edit") {
-                            self.client_caps.code_action_resolve = true;
-                        }
+                if let Some(resolve_support) = &code_action.resolve_support {
+                    if resolve_support.properties.iter().any(|it| it == "edit") {
+                        self.client_caps.code_action_resolve = true;
                     }
-                    _ => (),
                 }
             }
         }
diff --git a/crates/rust-analyzer/src/handlers.rs b/crates/rust-analyzer/src/handlers.rs
index 95659b0db..782797e85 100644
--- a/crates/rust-analyzer/src/handlers.rs
+++ b/crates/rust-analyzer/src/handlers.rs
@@ -1322,6 +1322,28 @@ pub(crate) fn handle_open_docs(
     Ok(remote.and_then(|remote| Url::parse(&remote).ok()))
 }
 
+pub(crate) fn handle_open_cargo_toml(
+    snap: GlobalStateSnapshot,
+    params: lsp_ext::OpenCargoTomlParams,
+) -> Result<Option<lsp_types::GotoDefinitionResponse>> {
+    let _p = profile::span("handle_open_cargo_toml");
+    let file_id = from_proto::file_id(&snap, &params.text_document.uri)?;
+    let maybe_cargo_spec = CargoTargetSpec::for_file(&snap, file_id)?;
+    if maybe_cargo_spec.is_none() {
+        return Ok(None);
+    }
+
+    let cargo_spec = maybe_cargo_spec.unwrap();
+    let cargo_toml_path = cargo_spec.workspace_root.join("Cargo.toml");
+    if !cargo_toml_path.exists() {
+        return Ok(None);
+    }
+    let cargo_toml_url = to_proto::url_from_abs_path(&cargo_toml_path);
+    let cargo_toml_location = Location::new(cargo_toml_url, Range::default());
+    let res = lsp_types::GotoDefinitionResponse::from(cargo_toml_location);
+    Ok(Some(res))
+}
+
 fn implementation_title(count: usize) -> String {
     if count == 1 {
         "1 implementation".into()
diff --git a/crates/rust-analyzer/src/lsp_ext.rs b/crates/rust-analyzer/src/lsp_ext.rs
index a7c3028e4..a5c65fa3e 100644
--- a/crates/rust-analyzer/src/lsp_ext.rs
+++ b/crates/rust-analyzer/src/lsp_ext.rs
@@ -354,3 +354,17 @@ impl Request for ExternalDocs {
     type Result = Option<lsp_types::Url>;
     const METHOD: &'static str = "experimental/externalDocs";
 }
+
+pub enum OpenCargoToml {}
+
+impl Request for OpenCargoToml {
+    type Params = OpenCargoTomlParams;
+    type Result = Option<lsp_types::GotoDefinitionResponse>;
+    const METHOD: &'static str = "experimental/openCargoToml";
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct OpenCargoTomlParams {
+    pub text_document: TextDocumentIdentifier,
+}
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index 6e6cac42e..68a53bbcb 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -438,6 +438,7 @@ impl GlobalState {
             .on::<lsp_ext::CodeActionResolveRequest>(handlers::handle_code_action_resolve)
             .on::<lsp_ext::HoverRequest>(handlers::handle_hover)
             .on::<lsp_ext::ExternalDocs>(handlers::handle_open_docs)
+            .on::<lsp_ext::OpenCargoToml>(handlers::handle_open_cargo_toml)
             .on::<lsp_types::request::OnTypeFormatting>(handlers::handle_on_type_formatting)
             .on::<lsp_types::request::DocumentSymbolRequest>(handlers::handle_document_symbol)
             .on::<lsp_types::request::WorkspaceSymbol>(handlers::handle_workspace_symbol)