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<?hh $f = ($v)==> {echo $v;}; $f(3);
based on AdmVS
Output for 5.4.34
Parse error: syntax error, unexpected '$f' (T_VARIABLE) in /in/7eqNE on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh $f = ($v)==> {echo $v;}; $f(3);