This file is indexed.

/usr/share/xcrysden/util/tcl_index is in xcrysden-data 1.5.60-1build3.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
#this line restarts tclsh \
exec tclsh "$0" "$@"

if { [glob -nocomplain -- *.tcl] != {} } {
    auto_mkindex [pwd] *.tcl
}
exit