class Xcodeproj::Project::Object::PBXCopyFilesBuildPhase

def symbol_dst_subfolder_spec=(value)
  numeric_value = Constants::COPY_FILES_BUILD_PHASE_DESTINATIONS[value]
  raise "[Xcodeproj] Value checking error: got `#{value.inspect}` for" \
      ' attribute: dst_subfolder_spec' if numeric_value.nil?
  self.dst_subfolder_spec = numeric_value
end