mozilla-services/android-sync — comment on commit e6de1366273bb518fb27a0c0114afb399a51b639
File: src/main/java/org/mozilla/gecko/sync/synchronizer/ConcurrentRecordConsumer.java line 142
By rnewman:

String concatenation in Java implicitly calls .toString on its arguments.

This is just a trace method. The object identity in delegate is kinda handy.