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<?php trait f { abstract function foo(); } class c{ use f; }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Class c contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (c::foo) in /in/5QTGp on line 7
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Class c contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (c::foo) in /in/5QTGp on line 9
Process exited with code 255.

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