buf, err = json.Marshal([]Trash{{
SizedDigest: arvados.SizedDigest("acbd18db4cc2f85cedef654fccc4a4d8+3"),
From: mnt,
Mtime: 123456789}})
c.Check(err, check.IsNil)
buf, err = json.Marshal([]Trash{{
SizedDigest: arvados.SizedDigest("acbd18db4cc2f85cedef654fccc4a4d8+3"),
From: mnt,
Mtime: 123456789}})
c.Check(err, check.IsNil)