/usr/share/tcltk/tcllib1.16/doctools2base/paths.tcl is in tcllib 1.16-dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
#	Generic path list management, for use by import management.
#
# Copyright (c) 2009 Andreas Kupries <andreas_kupries@sourceforge.net>
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# 
# RCS: @(#) $Id: paths.tcl,v 1.2 2009/04/29 02:09:46 andreas_kupries Exp $
# Each object manages a list of paths.
# ### ### ### ######### ######### #########
## Requisites
package require Tcl 8.4
package require snit
# ### ### ### ######### ######### #########
## API
snit::type ::doctools::paths {
    # ### ### ### ######### ######### #########
    ## Options :: None
    # ### ### ### ######### ######### #########
    ## Creation, destruction
    # Default constructor.
    # Default destructor.
    # ### ### ### ######### ######### #########
    ## Methods :: Querying and manipulating the list of paths.
    method paths {} {
	return $mypaths
    }
    method add {path} {
	set pos [lsearch $mypaths $path]
	if {$pos >= 0 } return
	lappend mypaths $path
	return
    }
    method remove {path} {
	set pos [lsearch $mypaths $path]
	if {$pos < 0} return
	set  mypaths [lreplace $mypaths $pos $pos]
	return
    }
    method clear {} {
	set mypaths {}
	return
    }
    # ### ### ### ######### ######### #########
    ## Internal methods :: None
    # ### ### ### ######### ######### #########
    ## State :: List of paths.
    variable mypaths {}
    ##
    # ### ### ### ######### ######### #########
}
# ### ### ### ######### ######### #########
## Ready
package provide doctools::paths 0.1
return
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