- Output for 7.0.0 - 7.1.0RC4
- Array (  => foo  => bar  => baz )
- Output for 4.3.0 - 5.6.21, hhvm-3.12.0
- Warning: Constants may only evaluate to scalar values in /in/LYVgb on line 3 Notice: Use of undefined constant WORDS - assumed 'WORDS' in /in/LYVgb on line 5 WORDS
- Output for hhvm-3.10.0
Process exited with code 153.