From: nobu@... Date: 2014-10-11T04:46:56+00:00 Subject: [ruby-core:65609] [ruby-trunk - Bug #10315] [Closed] Override policy for duplicated keywords Issue #10315 has been updated by Nobuyoshi Nakada. Status changed from Open to Closed % Done changed from 0 to 100 Applied in changeset r47877. ---------- parse.y: precedence of duplicated keys * parse.y (assocs): concatenate splatted literal hashes. the former key has precedence even if duplicated literal keys follow. [ruby-core:65368] [Bug #10315] ---------------------------------------- Bug #10315: Override policy for duplicated keywords https://bugs.ruby-lang.org/issues/10315#change-49348 * Author: Koichi Sasada * Status: Closed * 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/