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<?hh var_dump(fun('function_exists'));
based on RuhRp
Output for 5.4.34
Parse error: syntax error, unexpected 'var_dump' (T_STRING) in /in/E1Jig on line 2
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh var_dump(fun('function_exists'));