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<?php declare(strict_types=1); function foo(integer $a) { echo $a . PHP_EOL; } $integer = '42'; foo((integer) $integer); foo($integer);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: "integer" will be interpreted as a class name. Did you mean "int"? Write "\integer" to suppress this warning in /in/mRceK on line 4 Fatal error: Uncaught TypeError: foo(): Argument #1 ($a) must be of type integer, int given, called in /in/mRceK on line 7 and defined in /in/mRceK:4 Stack trace: #0 /in/mRceK(7): foo(42) #1 {main} thrown in /in/mRceK on line 4
Process exited with code 255.

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