Small bug in thread.tcl in Thread_Start proc...
in 3.5x releases...
Was
proc Thread_Start {} {
global auto_path tcl_library
set id [Thread_Create]
Thread_Send $id \
{Stderr "Thread starting."}
...........
Should be
proc Thread_Start {} {
global auto_path tcl_library
set id [Thread_Create]
Thread_Send $id \
{catch {puts stderr "Thread starting."}}
.............