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<?php interface I{ public function i(); } class C { public function i() { echo __CLASS__; } } class D { public function __construct(I $c) { echo __CLASS__; } } new D(new C);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: D::__construct(): Argument #1 ($c) must be of type I, C given, called in /in/pq0Be on line 22 and defined in /in/pq0Be:16 Stack trace: #0 /in/pq0Be(22): D->__construct(Object(C)) #1 {main} thrown in /in/pq0Be on line 16
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to D::__construct() must implement interface I, instance of C given, called in /in/pq0Be on line 22 and defined in /in/pq0Be:16 Stack trace: #0 /in/pq0Be(22): D->__construct(Object(C)) #1 {main} thrown in /in/pq0Be on line 16
Process exited with code 255.
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Catchable fatal error: Argument 1 passed to D::__construct() must implement interface I, instance of C given, called in /in/pq0Be on line 22 and defined in /in/pq0Be on line 16
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Fatal error: Argument 1 passed to D::__construct() must implement interface I, called in /in/pq0Be on line 22 and defined in /in/pq0Be on line 16
Process exited with code 255.
Output for 5.0.5
Fatal error: Argument 1 must implement interface I in /in/pq0Be on line 16
Process exited with code 255.
Output for 5.0.0 - 5.0.4

Process exited with code 139.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/pq0Be on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/pq0Be on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/pq0Be on line 3
Process exited with code 255.

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