code: public int errorCount() {
          if (delegateCompiler != null && delegateCompiler != this)
              return delegateCompiler.errorCount();
          else {
              if (werror && log.nerrors == 0 && log.nwarnings > 0) {
                  log.error("warnings.and.werror");
              }
          }
          return log.nerrors;
      }
docs: The number of errors reported so far.