I want to end/exit/destroy a sporked shred. In this example code, I attempt to exit a sporked function. When executed, the shred doesn't stop as I'd expect. fun void foo(){ 1::week => now;

} spork ~ foo() @=> Shred shred; 2::second => now; shred.exit(); 1::week => now;

How can I exit the sporked shred?