asset_file_path!

# File actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb, line 134
          def asset_file_path!(absolute_path, error_if_file_is_uri = false)
            if asset_paths.is_uri?(absolute_path)
              raise(Errno::ENOENT, "Asset file #{path} is uri and cannot be merged into single file") if error_if_file_is_uri
            else
              raise(Errno::ENOENT, "Asset file not found at '#{absolute_path}'" ) unless File.exist?(absolute_path)
              return absolute_path
            end
          end