This file is indexed.

/usr/include/lua5.2/lua-socket-serial.h is in lua-socket-dev 3.0~rc1+git+ac3201d-4.

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

The actual contents of the file can be viewed below.

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/* This file has been automatically generated by dh-lua */

extern int luaopen_socket_serial(lua_State*);

/* eof */