Merge #10332

10332: minor: Allow overwriting RUST_BACKTRACE for the server manually r=jonas-schievink a=Veykril

Trying to figure out why we aren't getting backtraces for windows builds from CI, this let's one set the backtraces to `FULL`
Might be cc rust-lang/rust#87481
bors r+

Co-authored-by: Lukas Wirth <[email protected]>

Author: bors[bot]

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

@@ -92,7 +92,9 @@ fn try_main() -> Result<()> {
 }
 
 fn setup_logging(log_file: Option<&Path>) -> Result<()> {
-    env::set_var("RUST_BACKTRACE", "short");
+    if env::var("RUST_BACKTRACE").is_err() {
+        env::set_var("RUST_BACKTRACE", "short");
+    }
 
     let log_file = match log_file {
         Some(path) => {