From: merch-redmine@... Date: 2019-12-10T23:23:15+00:00 Subject: [ruby-core:96192] [Ruby master Bug#16414] Incompatible behavior of Proc/lambda with single argument when using `Enumerator::Lazy#with_index` Issue #16414 has been updated by jeremyevans0 (Jeremy Evans). I have a possible fix for this: https://github.com/ruby/ruby/pull/2742 After CI completes, I'll try to merge it so it makes 2.7.0-rc1. ---------------------------------------- Bug #16414: Incompatible behavior of Proc/lambda with single argument when using `Enumerator::Lazy#with_index` https://bugs.ruby-lang.org/issues/16414#change-83075 * Author: tomog105 (Tomohiro Ogoke) * Status: Open * Priority: Normal * Assignee: * Target version: * ruby -v: ruby 2.7.0dev (2019-12-10T10:12:21Z master af11efd377) [x86_64-darwin18] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN ---------------------------------------- The following code raised an error `wrong number of arguments (given 1, expected 2) (ArgumentError)` in master. ``` $ ruby -e 'lambda = -> (s, i) { "#{i}:#{s}" }; p %w(a b c).each.lazy.with_index.map(&lambda).first(2)' # expected result => ["0:a", "1:b"] ``` This code is valid up till Ruby 2.6.5 and 2.7.0-preview1, but it raised the error in Ruby 2.7.0-preview2 or later. Maybe, this behavior has been there since the implementation of `Enumerator::Lazy#with_index`. Is this behaviour intended? -- https://bugs.ruby-lang.org/ Unsubscribe: