libservo: add FIXME for script-to-constellation logging

Signed-off-by: Delan Azabani <[email protected]>

Author: delan

components/servo/lib.rs

@@ -1185,6 +1185,9 @@ where
     }
 }
 
+/// Copy script process logs to the constellation, for crash detection.
+///
+/// Only used in multiprocess mode (-M, --multiprocess).
 pub fn set_logger(script_to_constellation_chan: ScriptToConstellationChan) {
     let con_logger = FromScriptLogger::new(script_to_constellation_chan);
     let env = env_logger::Env::default();
@@ -1193,7 +1196,8 @@ pub fn set_logger(script_to_constellation_chan: ScriptToConstellationChan) {
     let filter = max(env_logger.filter(), con_logger.filter());
     let logger = BothLogger(env_logger, con_logger);
 
-    log::set_boxed_logger(Box::new(logger)).expect("Failed to set logger.");
+    // FIXME: now fails because tracing-subscriber has already set a logger
+    log::set_boxed_logger(Box::new(logger)).ok();
     log::set_max_level(filter);
 }