message: Return false instead of exiting
diff: @@ -121,7 +121,7 @@ bool RunIndexTests(const std::string& filter_path, bool enable_update) {
  std::cerr << "Index tests must be run using clang version \""
  << kRequiredClangVersion << "\" (cquery is running with \""
  << GetClangVersion() << "\")" << std::endl;
  - exit(1);
  + return false;
  }
  bool success = true;
  