/usr/include/thrust/detail/functional/ is in libthrust-dev 1.8.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/thrust/detail/functional/actor.h
/usr/include/thrust/detail/functional/actor.inl
/usr/include/thrust/detail/functional/argument.h
/usr/include/thrust/detail/functional/composite.h
/usr/include/thrust/detail/functional/operators/
/usr/include/thrust/detail/functional/operators.h
/usr/include/thrust/detail/functional/operators/arithmetic_operators.h
/usr/include/thrust/detail/functional/operators/assignment_operator.h
/usr/include/thrust/detail/functional/operators/bitwise_operators.h
/usr/include/thrust/detail/functional/operators/compound_assignment_operators.h
/usr/include/thrust/detail/functional/operators/logical_operators.h
/usr/include/thrust/detail/functional/operators/operator_adaptors.h
/usr/include/thrust/detail/functional/operators/relational_operators.h
/usr/include/thrust/detail/functional/placeholder.h
/usr/include/thrust/detail/functional/value.h