[#58730] [ruby-trunk - misc #9188][Open] r43870 make benchmark/bm_so_k_nucleotide.rb slow — "authorNari (Narihiro Nakamura)" <authorNari@...>

17 messages 2013/12/01

[#58732] [ruby-trunk - Bug #9189][Open] Build failure on Windows in case of nonascii TEMP environment. — "phasis68 (Heesob Park)" <phasis@...>

11 messages 2013/12/01

[#58750] [ruby-trunk - Feature #9190][Open] Expose serial helper macros — "simeonwillbanks (Simeon Willbanks)" <sfw@...>

13 messages 2013/12/01

[#58756] [ruby-trunk - Bug #9192][Open] Inconsistent comparison between Float and BigDecimal — "vatsu (Gustavo Sales)" <vatsu21@...>

18 messages 2013/12/02

[#58797] [ruby-trunk - Bug #9198][Open] Segfault in TestException#test_machine_stackoverflow — "vo.x (Vit Ondruch)" <v.ondruch@...>

11 messages 2013/12/02

[#58833] [ruby-trunk - Bug #9205][Open] Assertion failed: heap_pages_deferred_final == 0 — "phasis68 (Heesob Park)" <phasis@...>

11 messages 2013/12/03

[#58866] [ruby-trunk - misc #9215][Open] Maintenance Policy for Future Releases (2.1.0 & beyond) — "hone (Terence Lee)" <hone02@...>

17 messages 2013/12/05

[#58876] [ruby-trunk - Bug #9221][Open] Time.parse performance becomes exponentially worse as string length grows — "mpelzsherman (Michael Pelz-Sherman)" <mpelzsherman@...>

15 messages 2013/12/05

[#58948] [ruby-trunk - Bug #9226][Open] Getting method `inspect' called on unexpected T_NODE object (0x000000025ddea8 flags=0x109089c klass=0x0) (NotImplementedError) from Hash#inspect — "myronmarston (Myron Marston)" <myron.marston@...>

11 messages 2013/12/07

[#59032] [ruby-trunk - Bug #9239][Open] Array#to_h ignores flat arrays — "sawa (Tsuyoshi Sawada)" <sawadatsuyoshi@...>

15 messages 2013/12/10

[#59122] [ruby-trunk - Bug #9251][Open] ! operator has lower precedence than = in an assignment expression — "rits (First Last)" <redmine@...>

26 messages 2013/12/15

[#59198] [ruby-trunk - Bug #9262][Open] global_method_cache should be configurable or grow automatically — "tmm1 (Aman Gupta)" <ruby@...1.net>

28 messages 2013/12/19

[#59209] [ruby-trunk - Bug #9264][Open] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — "spastorino (Santiago Pastorino)" <santiago@...>

15 messages 2013/12/19
[#59211] [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — "zzak (Zachary Scott)" <e@...> 2013/12/19

[#59212] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Santiago Pastorino <spastorino@...> 2013/12/19

zzak, make distclean is the first thing I've ran. Read the gist again :),

[#59213] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Zachary Scott <e@...> 2013/12/19

Sorry I missed the gist, can you try building outside of $srcdir?

[#59214] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Santiago Pastorino <spastorino@...> 2013/12/19

It works if I do ...

[#59215] Re: [ruby-trunk - Bug #9264][Feedback] Compiling error: encdb.bundle Undefined symbols for architecture x86_64 — Zachary Scott <e@...> 2013/12/19

I've been using the following:

[#59255] [ruby-trunk - Bug #9276][Open] "RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead" warning should not be issued when both ENV vars are set. — "myronmarston (Myron Marston)" <myron.marston@...>

10 messages 2013/12/21

[#59260] [ruby-trunk - Feature #9278][Open] Magic comment "immutable: string" makes "literal".freeze the default for that file — "colindkelley (Colin Kelley)" <colin@...>

12 messages 2013/12/22

[#59343] [ruby-trunk - Bug #9309][Open] Crash while running tests — "mdemare (Michiel de MAre)" <merloen@...>

12 messages 2013/12/27

[#59345] [ruby-trunk - Bug #9310][Open] inheritance.rb: 27: [BUG] Segmentation fault at 0x00000c — "jasnow (Al Snow)" <jasnow@...>

10 messages 2013/12/27

[#59349] [ruby-trunk - Bug #9312][Open] Build the ruby executable in bin/ — "postmodern (Hal Brodigan)" <postmodern.mod3@...>

13 messages 2013/12/28

[#59365] [ruby-trunk - Bug #9316][Open] BigDecimal division in Ruby 2.1 — "abernardes (Andre Oliveira)" <abernardes@...>

15 messages 2013/12/28

[#59398] [ruby-trunk - Bug #9321][Open] rb_mod_const_missing does not generate a c-return event — "drkaes (Stefan Kaes)" <stkaes@...>

41 messages 2013/12/30

[#59429] [ruby-trunk - Feature #9330][Open] [PATCH 0/3] avoid redundant fcntl/fstat syscalls for cloexec sockets — "normalperson (Eric Wong)" <normalperson@...>

10 messages 2013/12/31

[ruby-core:59127] [ruby-trunk - Bug #9251] ! operator has lower precedence than = in an assignment expression

From: "rits (First Last)" <redmine@...>
Date: 2013-12-16 03:31:02 UTC
List: ruby-core #59127
Issue #9251 has been updated by rits (First Last).


shyouhei (Shyouhei Urabe) wrote:
> When you want to use it in while loop your supposition is not that concrete.

not clear what you're saying

> 
> 
>   while ! line = gets do
>      ....
>   end

your example merely illustrates the current behavior, it does not address its correctness

First of all, it doesn't matter where the expression appears, the rules of precedence don't vary (at least I would hope not), so there is no reason to introduce context into the discussion, is there?

The precedence rules are pretty clearly spelled out in "the ruby programming language" book, the ! operator has higher precedence than the = operator, therefore "!a = b" is "(!a) = b" not "!(a = b)"

 

----------------------------------------
Bug #9251: ! operator has lower precedence than = in an assignment expression
https://bugs.ruby-lang.org/issues/9251#change-43689

Author: rits (First Last)
Status: Open
Priority: Normal
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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