can't read "dir": no such variable
    while executing
"file join $dir coroutine.tcl"
    (in namespace eval "::request" script line 2)
    invoked from within
"namespace eval ::request $script"
    ("::try" body line 12)
OUTPUT BUFFER:
if {![package vsatisfies [package provide Tcl] 8.6]} {return}
package ifneeded coroutine       1.2   [list source [file join $dir coroutine.tcl]]
package ifneeded coroutine::auto 1.1.3 [list source [file join $dir coro_auto.tcl]]