From: naruse@... Date: 2017-03-11T14:48:10+00:00 Subject: [ruby-core:80021] [Ruby trunk Bug#12855] Inconsistent keys identity in compare_by_identity Hash when using literals Issue #12855 has been updated by Yui NARUSE. Backport changed from 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN to 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: DONE ruby_2_4 r57848 merged revision(s) 57278,57279. ---------------------------------------- Bug #12855: Inconsistent keys identity in compare_by_identity Hash when using literals https://bugs.ruby-lang.org/issues/12855#change-63442 * Author: Benoit Daloze * Status: Closed * Priority: Normal * Assignee: Aman Gupta * Target version: * ruby -v: ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux] * Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: DONE ---------------------------------------- This seems a regression since 2.2. I would guess it's due to some optimization for having a string literal between []=. That optimization should not trigger for compare_by_identity hashes, so both cases below are consistent. ~~~ruby h = {}.compare_by_identity h['pear'] = 1 h['pear'] = 2 p h.size # => 1 p h h = {}.compare_by_identity k1 = 'pear' h[k1] = 1 k2 = 'pear' h[k2] = 2 p h.size # => 2 p h ~~~ -- https://bugs.ruby-lang.org/ Unsubscribe: