/usr/lib/ocaml/deriving/deriving_num.mli is in libderiving-ocsigen-ocaml-dev 0.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | module Show_num : Deriving_Show.Show with type a = Num.num
module Eq_num : Deriving_Eq.Eq with type a = Num.num
module Typeable_num : Deriving_Typeable.Typeable with type a = Num.num
module Dump_num : Deriving_Dump.Dump with type a = Num.num
module Pickle_num : Deriving_Pickle.Pickle with type a = Num.num
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