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<?php class Test { public function __toString() { return $this; } } (string) (new Test);
Output for 8.4.3 - 8.4.12
Fatal error: Out of memory (allocated 71303168 bytes) (tried to allocate 2281472 bytes) in /in/Dbe6G on line 0 mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.4.1 - 8.4.2
Fatal error: Out of memory (allocated 71487488 bytes) (tried to allocate 2662400 bytes) in /in/Dbe6G on line 0 mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.3.16 - 8.3.25
Fatal error: Out of memory (allocated 72765440 bytes) (tried to allocate 3956736 bytes) in /in/Dbe6G on line 0 mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.3.5 - 8.3.15
Fatal error: Out of memory (allocated 73953280 bytes) (tried to allocate 5140480 bytes) in /in/Dbe6G on line 0 mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.3.0 - 8.3.4
Fatal error: Out of memory (allocated 23068672 bytes) (tried to allocate 24576 bytes) in /in/Dbe6G on line 0 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29

Process exited with code 139.
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Method Test::__toString() must return a string value in /in/Dbe6G:9 Stack trace: #0 {main} thrown in /in/Dbe6G on line 9
Process exited with code 255.
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Recoverable fatal error: Method Test::__toString() must return a string value in /in/Dbe6G on line 9
Process exited with code 255.

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