This file is indexed.

/usr/share/cmake-3.5/Modules/CheckIncludeFile.c.in is in cmake-data 3.5.1-1ubuntu1.

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

The actual contents of the file can be viewed below.

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#include <${CHECK_INCLUDE_FILE_VAR}>

#ifdef __CLASSIC_C__
int main()
{
  return 0;
}
#else
int main(void)
{
  return 0;
}
#endif