/usr/lib/ghc-doc/hoogle/strptime.txt is in libghc-strptime-doc 1.0.6-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-strptime-doc/html/strptime.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-strptime-doc/html/strptime.txt