[#51329] [ruby-trunk - Feature #7677][Open] YAML load mode that does instantiate Ruby — "trans (Thomas Sawyer)" <transfire@...>
7 messages
2013/01/09
[#51347] [ruby-trunk - Bug #7679][Open] IRB history is broken — "zzak (Zachary Scott)" <zachary@...>
15 messages
2013/01/10
[#51348] [ruby-trunk - Bug #7680][Open] IRB autocompletion doesn't autocomplete methods — "zzak (Zachary Scott)" <zachary@...>
8 messages
2013/01/10
[#51389] [ruby-trunk - Bug #7688][Open] Error hiding with rb_rescue() on Comparable#==, #coerce and others — "Eregon (Benoit Daloze)" <redmine@...>
34 messages
2013/01/11
[#59674] [ruby-trunk - Feature #7688] Error hiding with rb_rescue() on Comparable#==, #coerce and others
— "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
2014/01/09
[#59675] [ruby-trunk - Feature #7688] Error hiding with rb_rescue() on Comparable#==, #coerce and others
— "marcandre (Marc-Andre Lafortune)" <ruby-core@...>
2014/01/09
[#59679] Re: [ruby-trunk - Feature #7688] Error hiding with rb_rescue() on Comparable#==, #coerce and others
— "Martin J. Dürst" <duerst@...>
2014/01/10
On 2014/01/10 7:42, marcandre (Marc-Andre Lafortune) wrote:
[#51391] [ANN] Implementer Meeting — Aaron Patterson <tenderlove@...>
Hey everyone,
9 messages
2013/01/11
[#51421] Re: [ANN] Implementer Meeting
— Mark Rada <markrada26@...>
2013/01/14
Hello Aaron,
[#51431] Re: [ANN] Implementer Meeting
— Marc-Andre Lafortune <ruby-core-mailing-list@...>
2013/01/14
I'm worried about issues with Enumerator::Lazy. Should we discuss this at
[#51399] [ruby-trunk - Bug #7689][Open] Crash @enumerator.so with ruby 1.9.3/thin/RoR 3.2.11 — "saepia (Marcin Lewandowski)" <marcin@...>
6 messages
2013/01/12
[#51441] [ruby-trunk - Bug #7699][Open] rubyspec failed: BigDecimal#divmod Can be reversed with * and + — "mrkn (Kenta Murata)" <muraken@...>
8 messages
2013/01/15
[#51453] [REMINDER] Implemeter Meeting — Aaron Patterson <tenderlove@...>
Hey everyone,
5 messages
2013/01/15
[#51454] [CommonRuby - Feature #7701][Open] Non-optional (required) keyword args — "headius (Charles Nutter)" <headius@...>
31 messages
2013/01/15
[#53256] [CommonRuby - Feature #7701] Non-optional (required) keyword args
— "headius (Charles Nutter)" <headius@...>
2013/03/09
[#51496] Ruby 2.0 Meeting Schedule — Aaron Patterson <tenderlove@...>
At the Implemeters Meeting, we talked about meeting again in 2 weeks
5 messages
2013/01/17
[#51497] Schedule next developer meeting — Aaron Patterson <tenderlove@...>
At the last meeting, we agreed upon having another meeting four weeks
5 messages
2013/01/17
[#51499] [ruby-trunk - Feature #7712][Open] Add .txt extensions to all plain-text documentation files for Windows users — "postmodern (Hal Brodigan)" <postmodern.mod3@...>
9 messages
2013/01/18
[#51545] Haiku port problem — Paulo Geyer <paulogeyer@...>
I'm trying to port ruby 1.9.3-p347 to Haiku (http://www.haiku-os.org/)
5 messages
2013/01/21
[#51578] [ruby-trunk - Bug #7729][Open] __dir__ returns a absolute dir path — "authorNari (Narihiro Nakamura)" <authorNari@...>
8 messages
2013/01/23
[#51623] [ruby-trunk - Feature #7739][Open] Define Hash#| as Hash#reverse_merge in Rails — "alexeymuranov (Alexey Muranov)" <redmine@...>
24 messages
2013/01/24
[#51726] [ruby-trunk - Feature #7751][Open] How to encapsulate File.delete and File.rename into one 'transaction'? — "mghomn (Justin Peal)" <yujianbin@...>
5 messages
2013/01/29
[#51735] [ruby-trunk - Bug #7752][Open] Rational/Float/Fixnum/Bignum `.to_s.encoding` is US-ASCII — "coffeejunk (Maximilian Haack)" <mxhaack@...>
6 messages
2013/01/29
[ruby-core:51657] [ruby-trunk - Bug #5715] +/-1 ** Bignum returns different results than +/-1 ** Fixnum
From:
"marcandre (Marc-Andre Lafortune)" <ruby-core@...>
Date:
2013-01-25 05:46:33 UTC
List:
ruby-core #51657
Issue #5715 has been updated by marcandre (Marc-Andre Lafortune).
Target version set to 2.0.0
----------------------------------------
Bug #5715: +/-1 ** Bignum returns different results than +/-1 ** Fixnum
https://bugs.ruby-lang.org/issues/5715#change-35620
Author: john_firebaugh (John Firebaugh)
Status: Assigned
Priority: Normal
Assignee: marcandre (Marc-Andre Lafortune)
Category: core
Target version: 2.0.0
ruby -v: ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin10.8.0]
=begin
Consider (({1 ** expt})) and (({(-1) ** expt})).
When ((|expt|)) is a Fixnum, the result is always 1, -1, Rational(1/1), or Rational(-1,1) depending on the signs of the operands and parity of the exponent.
When ((|expt|)) is a Bignum, Float 1.0 is always returned. Either the behavior for Fixnum exponents should be followed exactly (preferred), or at the very least -1.0 should be returned when the base is -1 and the exponent is odd.
$VERBOSE = nil
wordsize = 8 * 1.size
fixnum_max = 2 ** (wordsize - 2) - 1
fixnum_min = -2 ** (wordsize - 2)
[1, -1].each do |a|
[ 1, 2, fixnum_max, fixnum_max + 1, fixnum_max + 2,
-1, -2, fixnum_min, fixnum_min - 1, fixnum_min - 2].each do |b|
puts "%5s ** %20s (%s) == %5s" % [a, b, b.class, a ** b]
end
end
Output:
1 ** 1 (Fixnum) == 1
1 ** 2 (Fixnum) == 1
1 ** 4611686018427387903 (Fixnum) == 1
1 ** 4611686018427387904 (Bignum) == 1
1 ** 4611686018427387905 (Bignum) == 1
1 ** -1 (Fixnum) == 1/1
1 ** -2 (Fixnum) == 1/1
1 ** -4611686018427387904 (Fixnum) == 1/1
1 ** -4611686018427387905 (Bignum) == 1.0 # Bug
1 ** -4611686018427387906 (Bignum) == 1.0 # Bug
-1 ** 1 (Fixnum) == -1
-1 ** 2 (Fixnum) == 1
-1 ** 4611686018427387903 (Fixnum) == -1
-1 ** 4611686018427387904 (Bignum) == 1
-1 ** 4611686018427387905 (Bignum) == -1
-1 ** -1 (Fixnum) == -1/1
-1 ** -2 (Fixnum) == 1/1
-1 ** -4611686018427387904 (Fixnum) == 1/1
-1 ** -4611686018427387905 (Bignum) == 1.0 # Bug
-1 ** -4611686018427387906 (Bignum) == 1.0 # Bug
=end
--
http://bugs.ruby-lang.org/