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<?php enum E : string { case A = 'a'; } E::from('b');
Output for git.master_jit, git.master, rfc.property-hooks
Fatal error: Uncaught ValueError: "b" is not a valid backing value for enum E in /in/N7Mc4:7 Stack trace: #0 /in/N7Mc4(7): E::from('b') #1 {main} thrown in /in/N7Mc4 on line 7
Process exited with code 255.

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