Document, how to view config in effect

2 files changed, 5 insertions, 2 deletions

diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 11cdae57f..1db5b4e7d 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -349,12 +349,12 @@ impl Config {
         res
     }
     pub fn update(&mut self, json: serde_json::Value) {
-        log::info!("Config::update({:#})", json);
+        log::info!("updating config from JSON: {:#}", json);
         if json.is_null() || json.as_object().map_or(false, |it| it.is_empty()) {
             return;
         }
         self.do_update(json);
-        log::info!("Config::update() = {:#?}", self);
+        log::info!("updated config: {:#?}", self);
     }
     fn do_update(&mut self, json: serde_json::Value) {
         let data = ConfigData::from_json(json);
diff --git a/docs/user/manual.adoc b/docs/user/manual.adoc
index 40f10972f..e3082d584 100644
--- a/docs/user/manual.adoc
+++ b/docs/user/manual.adoc
@@ -302,6 +302,9 @@ If the LSP binary is not available, GNOME Builder can install it when opening a
 rust-analyzer is configured via LSP messages, which means that it's up to the editor to decide on the exact format and location of configuration files.
 Please consult your editor's documentation to learn how to configure LSP servers.
 
+To verify which configuration is actually used by rust-analyzer, set `RA_LOG` environment variable to `rust_analyzer=info` and look for config-related messages.
+Logs should show both the JSON that rust-analyzer sees as well as the updated config.
+
 This is the list of config options rust-analyzer supports:
 
 include::./generated_config.adoc[]