I've been evaling threads into existence in my REPL for as long as can remember.

Each line (or set of lines) below is evaled when a double colon ;; is seen:

[0] Perl> use threads; use threads::shared;;
[Bad file descriptor] Perl> 
async{ sleep 5; print, sleep 1 for 1.. 10 }->detach; 
print, sleep 1 for 1.. 20;;
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