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<?hh function yieldInfiniteInts(): Continuation<int> { $i = 0; while (true) { yield $i++; echo "hola" } } $generator = yieldInfiniteInts();
based on umM0k
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'function' (T_FUNCTION) in /in/3hAa8 on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh function yieldInfiniteInts(): Continuation<int> { $i = 0; while (true) { yield $i++; echo "hola" } } $generator = yieldInfiniteInts();