From: headius@... Date: 2016-08-12T06:46:32+00:00 Subject: [ruby-core:76851] [Ruby trunk Bug#12671] Hash#to_proc result is not a lambda, but enforces arity Issue #12671 has been updated by Charles Nutter. JRuby implements Hash#to_proc as: ```ruby class Hash def to_proc method(:[]).to_proc end end ``` This allows us to present the proc as a lambda with correct arity: ``` $ jruby -e "pr = {}.to_proc; puts pr.arity; puts pr.lambda?" 1 true ``` It works for MRI too: ``` $ ruby23 -e "class Hash; def to_proc; method(:[]).to_proc; end; end; pr = {}.to_proc; puts pr.arity; puts pr.lambda?" 1 true ``` I think this is more representative of this proc's behavior. Can MRI do it this way? ---------------------------------------- Bug #12671: Hash#to_proc result is not a lambda, but enforces arity https://bugs.ruby-lang.org/issues/12671#change-60076 * Author: Charles Nutter * Status: Open * Priority: Normal * Assignee: * ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin14] * Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN ---------------------------------------- ``` $ ruby23 -e 'pr = {foo:1}.to_proc; puts pr.lambda?; pr.call rescue puts $!; pr.call(1, 2) rescue puts $!' false wrong number of arguments (given 0, expected 1) wrong number of arguments (given 2, expected 1) ``` I believe it should be marked as a lambda, since it enforces arity. -- https://bugs.ruby-lang.org/ Unsubscribe: