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<?php trait C { public $FOO = self::NAME . ' FOO'; } class D { use C; const NAME = 'D'; } class E { use C; const NAME = 'E'; } var_dump(D::$FOO); var_dump(E::$FOO);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Access to undeclared static property D::$FOO in /in/BY8hJ:17 Stack trace: #0 {main} thrown in /in/BY8hJ on line 17
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Access to undeclared static property: D::$FOO in /in/BY8hJ:17 Stack trace: #0 {main} thrown in /in/BY8hJ on line 17
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Fatal error: Access to undeclared static property: D::$FOO in /in/BY8hJ on line 17
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38
Parse error: syntax error, unexpected '.', expecting ',' or ';' in /in/BY8hJ on line 4
Process exited with code 255.

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