/usr/lib/tcltk/rivet2.3/rivet-tcl/lempty.tcl is in libapache2-mod-rivet 2.3.5-1.
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## lempty <list>
##
## Returns 1 if <list> is empty or 0 if it has any elements. This command
## emulates the TclX lempty command.
##
## $Id: lempty.tcl 1300262 2012-03-13 18:05:13Z mxmanghi $
##
###
namespace eval ::rivet {
proc lempty {list} {
if {[catch {llength $list} len]} { return 0 }
return [expr {$len == 0}]
}
}
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