2 files changed, 9 insertions, 1 deletions

diff --git a/crates/ra_lsp_server/src/main_loop.rs b/crates/ra_lsp_server/src/main_loop.rs
index c43637351..6b9f6a988 100644
--- a/crates/ra_lsp_server/src/main_loop.rs
+++ b/crates/ra_lsp_server/src/main_loop.rs
@@ -65,7 +65,7 @@ pub fn main_loop(
     let workspaces = match ws_worker.recv().unwrap() {
         Ok(ws) => vec![ws],
         Err(e) => {
-            log::warn!("loading workspace failed: {}", e);
+            log::error!("loading workspace failed: {}", e);
             Vec::new()
         }
     };
diff --git a/crates/ra_lsp_server/src/project_model/sysroot.rs b/crates/ra_lsp_server/src/project_model/sysroot.rs
index 1dbab57f8..3b2fa070b 100644
--- a/crates/ra_lsp_server/src/project_model/sysroot.rs
+++ b/crates/ra_lsp_server/src/project_model/sysroot.rs
@@ -44,6 +44,14 @@ impl Sysroot {
         let stdout = String::from_utf8(rustc_output.stdout)?;
         let sysroot_path = Path::new(stdout.trim());
         let src = sysroot_path.join("lib/rustlib/src/rust/src");
+        if !src.exists() {
+            failure::bail!(
+                "can't load standard library from sysroot\n\
+                 {:?}\n\
+                 try running `rustup component add rust-src`",
+                src,
+            );
+        }
 
         let mut sysroot = Sysroot {
             crates: Arena::default(),