From: ko1@... Date: 2014-10-02T06:22:29+00:00 Subject: [ruby-core:65368] [ruby-trunk - Bug #10315] [Open] Override policy for duplicated keywords Issue #10315 has been reported by Koichi Sasada. ---------------------------------------- Bug #10315: Override policy for duplicated keywords https://bugs.ruby-lang.org/issues/10315 * Author: Koichi Sasada * Status: Open * Priority: Normal * Assignee: Yukihiro Matsumoto * Category: core * Target version: current: 2.2.0 * ruby -v: 2.2-2.0 * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN ---------------------------------------- ```ruby p({k1: 'a', k1: 'b'}) #=> {:k1=>"b"} p({k1: 'a'}.merge({k1: 'b'})) #=> {:k1=>"b"} p(k1: 'a', k1: 'b') #=> {:k1=>"b"} p(k1: 'a', **{k1: 'b'}) #=> {:k1=>"a"} ``` IMO the last case should also output {:k1=>"b"}. Nobu said that we should show warning for such duplication (especially for 1st and 3rd cases) because we can detect duplication while parsing/compiling. -- https://bugs.ruby-lang.org/