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<?hh ($a = (($x) ==> $x + 1) )(3);
based on MgsKt
Output for 5.4.34
Parse error: syntax error, unexpected '>' in /in/A2C1Q on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh ($a = (($x) ==> $x + 1) )(3);