can't read "dir": no such variable
    while executing
"file join $dir generator.tcl"
    (in namespace eval "::request" script line 3)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
# Requires Tcl 8.6 and higher, to have the coroutines underlying generators.
if {![package vsatisfies [package provide Tcl] 8.6]} return
package ifneeded generator 0.1 [list source [file join $dir generator.tcl]]