{$spawn {
{$loop {
{$stdout writeln a}
}}
}}
spawn executes a list of statements in a new thread.
{$co {
{$map i [$range 1 20] {
{$stdout writeln $i}
}}
}}
co puts a list of statements in a queue. If the queue is empty, co starts a thread that calls each item in the queue, then exits.
The statements must not block.