Merge #3561 #3577

3561: feat: add debug code lens r=matklad a=hdevalke

Refs #3539

3577: Protect against infinite macro expansion in def collector r=edwin0cheng a=flodiebold

Something I noticed while trying to make macro expansion more resilient against errors.

There was a test for this, but it wasn't actually working because the first recursive expansion failed. (The comma...)

Even with this limit, that test (when fixed) still takes some time to pass because of the exponential growth of the expansions, so I disabled it and added a different one without growth.

CC @edwin0cheng 

Co-authored-by: Hannes De Valkeneer <hannes@de-valkeneer.be>
Co-authored-by: hdevalke <2261239+hdevalke@users.noreply.github.com>
Co-authored-by: Florian Diebold <florian.diebold@freiheit.com>

crates/rust-analyzer/src/config.rs

@@ -55,6 +55,9 @@ pub struct ServerConfig {
 
     /// Cargo feature configurations.
     pub cargo_features: CargoFeatures,
+
+    /// Enabled if the vscode_lldb extension is available.
+    pub vscode_lldb: bool,
 }
 
 impl Default for ServerConfig {
@@ -76,6 +79,7 @@ impl Default for ServerConfig {
             additional_out_dirs: FxHashMap::default(),
             cargo_features: Default::default(),
             rustfmt_args: Vec::new(),
+            vscode_lldb: false,
         }
     }
 }