dukeboard/kevoree — comment on commit 97bfc37ce5bc67cc79fcd2d0083667587033cddb
File: kevoree-tools/org.kevoree.tools.annotation.processor/src/main/scala/org/kevoree/framework/annotation/processor/PostAptChecker.scala line 34
By gnain:

... and you are ;-) . The nbErrors == 0 is the (boolean) return statement of the check method and indicates if the checker detected errors or not. It is not an assignment.
Since errors' messages are printed directly in the console, the number of errors from each individual checker can be interesting, but I can not see the interest in giving this information to the developer.