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<?php namespace A { class Foo { public $foo; public function __construct() { $this->foo = function (int $a) { var_dump("foo"); }; } } } namespace { ((new A\Foo)->foo)(null); echo "Done\n"; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: A\Foo::A\{closure}(): Argument #1 ($a) must be of type int, null given, called in /in/tDjfk on line 16 and defined in /in/tDjfk:8 Stack trace: #0 /in/tDjfk(16): A\Foo->A\{closure}(NULL) #1 {main} thrown in /in/tDjfk on line 8
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to A\Foo::A\{closure}() must be of the type int, null given, called in /in/tDjfk on line 16 and defined in /in/tDjfk:8 Stack trace: #0 /in/tDjfk(16): A\Foo->A\{closure}(NULL) #1 {main} thrown in /in/tDjfk on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33
Fatal error: Uncaught TypeError: Argument 1 passed to A\Foo::A\{closure}() must be of the type integer, null given, called in /in/tDjfk on line 16 and defined in /in/tDjfk:8 Stack trace: #0 /in/tDjfk(16): A\Foo->A\{closure}(NULL) #1 {main} thrown in /in/tDjfk on line 8
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '(' in /in/tDjfk on line 16
Process exited with code 255.

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