This file is indexed.

/usr/include/diet/features.h is in dietlibc-dev 0.33~cvs20120325-6+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#ifndef _FEATURES_H
#define _FEATURES_H

#ifndef __dietlibc__
#error "not using the diet wrapper?!"
#endif

#endif