From: "rits (First Last)" <redmine@...>
Date: 2013-12-16T13:06:03+09:00
Subject: [ruby-core:59129] [ruby-trunk - Bug #9251] ! operator has lower	precedence than = in an assignment expression


Issue #9251 has been updated by rits (First Last).


nobu (Nobuyoshi Nakada) wrote:
> Then do you want it be a syntax error?
> Assignment to a negated expression makes no sense.
> Or can you elaborate its semantics?

It seems self evident to me that the specified rules of precedence should hold. In this case it would be a syntax error.
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Bug #9251: ! operator has lower precedence than = in an assignment expression
https://bugs.ruby-lang.org/issues/9251#change-43691

Author: rits (First Last)
Status: Feedback
Priority: Low
Assignee: 
Category: 
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) 



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