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 =={{header|Sidef}}==
 <lang ruby>var x = 42;
-var child = { x += 1 }.fork;
+{ x += 1; say x }.fork.wait;     # x is 43 here
+say x;                           # but here is still 42</lang>
-say child.wait; # prints: 43
-say x;          # but x is still 42</lang>
 =={{header|Slate}}==