can't read "dir": no such variable
    while executing
"file join $dir core.tcl"
    (in namespace eval "::request" script line 3)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
if {![package vsatisfies [package provide Tcl] 8.5]} {return}

package ifneeded tcl::chan::core 1   [list source [file join $dir core.tcl]]
package ifneeded tcl::chan::events 1 [list source [file join $dir events.tcl]]

if {![package vsatisfies [package provide Tcl] 8.6]} {return}

package ifneeded tcl::transform::core 1 [list source [file join $dir transformcore.tcl]]