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<?php $a = [ 'bar', 'baz' ]; class Foo { public $bar = 'zzz'; } var_dump((new Foo)->$a[0]);
Output for git.master, git.master_jit
Warning: Array to string conversion in /in/X9UQX on line 8 Warning: Undefined property: Foo::$Array in /in/X9UQX on line 8 Warning: Trying to access array offset on value of type null in /in/X9UQX on line 8 NULL
Output for rfc.property-hooks
Warning: Array to string conversion in /in/X9UQX on line 8 Warning: Undefined property: Foo::$Array in /in/X9UQX on line 8 Warning: Trying to access array offset on null in /in/X9UQX on line 8 NULL

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