```
% pandoc -t native -s --metadata-file command/5700-metadata-file-1.yml --metadata-file command/5700-metadata-file-2.yml
^D
Pandoc
  Meta
    { unMeta =
        fromList
          [ ( "desc"
            , MetaInlines
                [ Str "Both"
                , Space
                , Str "of"
                , Space
                , Str "these"
                , Space
                , Str "files"
                , Space
                , Str "should"
                , Space
                , Str "be"
                , Space
                , Str "loaded."
                ]
            )
          , ( "title"
            , MetaInlines
                [ Str "Multiple"
                , Space
                , Str "metadata"
                , Space
                , Str "files"
                , Space
                , Str "test"
                ]
            )
          ]
    }
  []
```