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<?php var_dump( 2<<-1, 2<<0, 2<<1, 2<<2, 2<<3 );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArithmeticError: Bit shift by negative number in /in/AWiMf:3 Stack trace: #0 {main} thrown in /in/AWiMf on line 3
Process exited with code 255.

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