Issue #19323 has been updated by usa (Usaku NAKAMURA). Backport changed from 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED to 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED backported into `ruby_3_1` at 344249674f7a7835445a44695664897fa4b83f00 ---------------------------------------- Bug #19323: Integer overflow in `Integer#<<` https://bugs.ruby-lang.org/issues/19323#change-103592 * Author: nobu (Nobuyoshi Nakada) * Status: Closed * Priority: Normal * Backport: 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE, 3.2: REQUIRED ---------------------------------------- ```ruby require 'rbconfig/sizeof' char_bit = RbConfig::LIMITS["UCHAR_MAX"].bit_length size_max = RbConfig::LIMITS["SIZE_MAX"] size_bit_max = size_max * char_bit 1 << size_bit_max ``` The above code raises an "integer overflow" error. ``` -:5:in `<<': integer overflow: 4611686018427387905 * 4 > 18446744073709551615 (ArgumentError) from -:5:in `<main>' ``` It doesn't seem like a proper or intentional exception. -- https://bugs.ruby-lang.org/