From: "rits (First Last)" Date: 2013-12-18T03:19:13+09:00 Subject: [ruby-core:59160] [ruby-trunk - Bug #9251] ! operator has lower precedence than = in an assignment expression Issue #9251 has been updated by rits (First Last). rits (First Last) wrote: > Dave Thomas is the author of "programming ruby" not the "the ruby programming language" to which I referred. matz is the author of "the ruby programming language", so if he confirms the current behavior as correct, he might be inclined to add a clarification there (if not present already), so you should probably assign this to him, not Dave ---------------------------------------- Bug #9251: ! operator has lower precedence than = in an assignment expression https://bugs.ruby-lang.org/issues/9251#change-43724 Author: rits (First Last) Status: Third Party's Issue Priority: Low Assignee: pragdave (Dave Thomas) Category: doc Target version: ruby -v: ruby 2.0.0p353 (2013-11-22 revision 43784) [i686-linux] Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN irb(main):001:0> !a = 1 (irb):1: warning: found = in conditional, should be == => false irb(main):002:0> a => 1 ! is supposed to have higher precedence than =, so !a = 1 should be (!a) = 1, and thus an error, not !(a = 1) -- http://bugs.ruby-lang.org/