can't read "argv": no such variable
    while executing
"lindex $argv 0"
    (in namespace eval "::request" script line 2)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
 package require vfs
 set __load [lindex $argv 0]
 set ext [file extension $__load]
 switch -exact -- $ext {
     .tar {
         package require vfs::tar
         set cmd vfs::tar::Mount
     }
     .zip {
         package require vfs::zip
         set cmd vfs::zip::Mount
     }
     .kit {
         package require vfs::mk4
         set cmd vfs::mk4::Mount
     }
     default {error "unknown extension : $ext"}
 }

 $cmd $__load $__load.0
 set argv0 [lindex $argv 0]
 set argv [lrange $argv 1 end]
 lappend auto_path $__load.0/lib
 source $__load.0/main.tcl