This file is indexed.

/usr/include/diet/dietref.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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/* diet includes this file to create linker dependencies on the diet
 * libc, so trying to link an object file compiled with diet against
 * glibc will fail. */

#ifndef NODIETREF
#ifdef __ASSEMBLER__
#include <endian.h>
.section .note
.long	4
.long	2f-1f
.long	0
.ascii	"diet"
1:
#if (__WORDSIZE == 64)
.quad __you_tried_to_link_a_dietlibc_object_against_glibc
#else
.long __you_tried_to_link_a_dietlibc_object_against_glibc
#endif
2:
.previous
#else
#include <dietrefdef.h>
__dietref("__you_tried_to_link_a_dietlibc_object_against_glibc");
#endif
#endif