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<?hh enum Foo : int { Blah = 1; } function f(Foo $x) {} f(Foo::Blah); f('hi');
based on 6KsOs
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected 'enum' (T_STRING) in /in/JaaKI on line 3
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<?hh enum Foo : int { Blah = 1; } function f(Foo $x) {} f(Foo::Blah); f('hi');