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<?php class Demo { public function __construct( final public string $v ) {} } $d = new Demo( "FOO" ); var_dump( $d ); $r = new ReflectionProperty( Demo::class, 'v' ); var_dump( $r->isFinal() );
Output for git.master_jit, git.master
Fatal error: Cannot use the final modifier on a parameter in /in/t2Pra on line 5
Process exited with code 255.

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