Merge #4101

4101: Panic proc macro srv if read request failed r=matklad a=edwin0cheng

This PR fixed a bug when the rust-analyzer is killed suddenly, the `rust-analyzer proc-macro` will become stale.

Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>

crates/rust-analyzer/src/bin/main.rs

@@ -66,7 +66,7 @@ fn setup_logging() -> Result<()> {
 }
 
 fn run_proc_macro_srv() -> Result<()> {
-    ra_proc_macro_srv::cli::run();
+    ra_proc_macro_srv::cli::run()?;
     Ok(())
 }