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async BLOCK; "async" creates a thread to execute the block immediately foll +owing it. This block is treated as an anonymous subroutine, and so m +ust have a semicolon after the closing brace.
Threads are implemented in a way that make them easy to misuse. Few people know how to use them correctly or will be able to provide h +elp. The use of interpreter-based threads in perl is officially discouraged +.