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<?hh function foo() : ?string{ return null; } var_dump(foo());
based on Uck6Z
Output for 5.4.34
Parse error: syntax error, unexpected 'function' (T_FUNCTION) in /in/J81rp on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh function foo() : ?string{ return null; } var_dump(foo());