Activity
From 09/30/2021 to 10/06/2021
10/06/2021
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09:03 PM Bug #18232: Ractor.make_shareable is broken in code loaded with RubyVM::InstructionSequence.load_from_binary
- I've attached a patch that fixes this (for me) along with a test. I had to change the information that we dump when ...
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- It looks like the [outer variables list](https://github.com/ruby/ruby/blob/e4d85d3a2d0c7d4a1abf981fb1ba557e21cad968/v...
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06:38 PM Bug #18232: Ractor.make_shareable is broken in code loaded with RubyVM::InstructionSequence.load_from_binary
- (this comment was moved to https://bugs.ruby-lang.org/issues/18243, replied to the wrong issue)
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- FYI the way it currently works for OpenStruct seems buggy on the Ractor side: #18243
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09:22 AM Bug #18232: Ractor.make_shareable is broken in code loaded with RubyVM::InstructionSequence.load_from_binary
- Because [OpenStruct was recently changed to use `make_shareable`](https://github.com/ruby/ostruct/pull/29), this bug ...
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08:58 PM Feature #10883 (Closed): Passing a block to itself
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08:56 PM Feature #18242: Parser makes multiple assignment sad in confusing way
- jeremyevans0 (Jeremy Evans) wrote in #note-1:
> [...] Attached is a patch that implements the necessary parser rules... -
- The parser is currently not setup to handle this, so I don't think it is a bug. You would have to add new parser rul...
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- Example:
``` ruby
a, b = 2, 1 if 1 < 2 # Works
a, b = [2, 1] if 1 < 2 # Works
(a, b) = 2, 1 if 1 ... -
08:51 PM Revision fb122042 (git): Enhanced RDoc for Enumerable (#4941)
- Treated:
#sum
#uniq
#compact -
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- This was fixed in Ruby 2.2:
```
$ ruby22 -ve 's = "foo"; class << s; def =~ (rhs); raise "a"; end; end; s =~ /foo... -
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- This feature was implemented as `transform_keys`, `transform_values`, and `to_h`.
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- This feature was implemented as `transform_keys`, `transform_values`, and `to_h`.
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- This was implemented by `Hash#to_h` taking a block starting in Ruby 2.6.
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07:38 PM Bug #18023 (Closed): Ractor#make_shareable changes the values of closured shareable objects
- Applied in changeset commit:git|76228191474c76810043b294a74bbb2f1808b3d9.
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Fix Ractor.make_shareable chang... - 07:38 PM Revision 121424a0 (git): * 2021-10-07 [ci skip]
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- env_copy() uses rb_ary_delete_at() with a loop counting up while
iterating through the list of read only locals. rb_a... -
- Smaller repro:
```
$ ruby -e 'Object.new.instance_eval { p object_id; proc = Ractor.make_shareable -> { self }; Rac... -
- ```ruby
class C
attr_accessor :foo
def setter_proc
Ractor.make_shareable(-> v { @foo = v })
end
end
... -
- This proposal has basically been implemented, with single-line pattern matching and valueless hash creation syntax:
... -
- I submitted a pull request to irb to fix this by calling super if UncaughtThrowError is raised by IRB::Context#exit: ...
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12:46 PM Feature #12075: some container#nonempty?
- Probably not, considering that some classes I named earlier, File::Stat and Enumerator, only have #size and no #lengt...
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11:19 AM Feature #12075: some container#nonempty?
- If `size?` will be chosen, should we also add `length?` as `size` and `length` are aliases?
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06:42 AM Revision d5349371 (git): Add the dependency of GNUmakefile itself [ci skip]
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- `rb_encoding` is defined as `const OnigEncodingType`.
Fix lots of C4114 warnings for each files by MSVC. -
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- Ruby cannot guarantee the resolutions of underlying filesystems.
10/05/2021
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- Treats:
#slice_after
#slice_when
#chunk_while -
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- Fixes [Feature #18148]
When set, all the loaded objects are returned as frozen.
If a proc is provided, it is called... -
- Applied in changeset commit:git|afcbb501ac17ba2ad5370ada5fd26e8dda9a5aaa.
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marshal.c Marshal.load accepts ... -
- * Enhanced RDoc for Enumerable#slice_before
* Enhanced RDoc for Enumerable#slice_before -
03:41 PM Bug #18241 (Closed): Question on String Concatentation Documentation
- Applied in changeset commit:git|c6706f15af123bdbb3b39a21903d85c78462d047.
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Fix documentation for String#{<... -
- This is a documentation bug. Both String#<< and String#concat mutate and return the receiver. I'll fix this shortly.
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03:22 PM Bug #18241: Question on String Concatentation Documentation
- edit: to be clear, I'm making a distinction between "new string" in the contents-sense, and "new string" in the memor...
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- Hello,
I noticed that the documentation for `<<` and `concat` both state that the result of each operation is a ne... - 03:41 PM Revision f883f550 (git): * 2021-10-06 [ci skip]
- 03:40 PM Revision 1bf3f3f4 (git): * remove trailing spaces. [ci skip]
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- These methods mutate and return the receiver, they don't create
and return a new string.
Fixes [Bug #18241] -
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03:33 PM Bug #18240: Random segfault on a local Rails server
Thanks Jeremy for your answer. We're gonna try to disable the C extensions one by one to identify if one behaves ba...-
- Unfortunately, I don't think there is enough information provided to help diagnose the specific cause of the issue (t...
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- Hello
I am having random segfault locally when rails a basic rails app.
The control frame is weird:
| -- Co... -
- Regarding ABI compatibility, AFAIK CRuby doesn't care about it for development versions.
I.e., conceptually we can t... -
01:08 PM Feature #18239: Variable Width Allocation: Strings
- Hi @duerst. Thank you for adding it to the developer meeting.
I understand your concern for gem incompatibility. S... -
02:22 PM Revision f2ca6526 (git): debug.gem v1.2.4
- This version fixes test failures on MacOS enviornment.
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01:33 PM Revision dc8fa269 (git): [ruby/reline] Reduce window size so that it can be displayed in my desktop
- https://github.com/ruby/reline/commit/22359d50ab
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- https://github.com/ruby/reline/commit/5f4a75c7a0
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- So testing is no longer necessary.
https://github.com/ruby/reline/commit/c59589548b -
- https://github.com/ruby/reline/commit/df2a1b4e08
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- I dislike unnatural casts.
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- The former uses the current location, while the latter takes a
non-null location. -
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- When Bison reports "memory exhausted", it means the parser stack
depth reached the limit `YYMAXDEPTH` which is defaul... -
- This version uses tempdir instead of homedir to store UNIX domain
socket. -
05:18 AM Revision f032c09b (git): rb_enc_left_char_head(): take void*
- Nobu doesn't like (char*) cast.
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- These functions assume ASCII compatibility. That has to be ensured in
their caller. -
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- Less macros == huge win.
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- 2,291 lines are too much! include/ruby/encoding.h became the biggest
header file once it had doxygen comments. Let ... -
- My bad. The document is clearly broken. Maybe I pressed my delete key
too much. [ci skip] -
- Why did they even exist?
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- After the change to use realpath on loaded features, Solaris CI
started failing in test_no_curdir (which tests behavi... - 04:06 AM Revision 16ce578d (git): Enable inline assembly of SET_MACHINE_STACK_END on AIX
10/04/2021
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11:55 PM Feature #18239: Variable Width Allocation: Strings
- This is impressive work. I haven't time to study all the details, in particular the benchmark results.
But I'm som... -
- Ah, fool question. Sorry. It was arguments on rdoc benchmark (I misunderstood that it is for general characteristics).
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- Yes, [rdoc generation](#rdoc-generation). Speed is 0.95x but memory usage dropped to 0.81x (0.89x for jemalloc).
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- > The performance decrease is small but the memory decrease is large.
Sorry, which results do you say? rdoc genera... -
- Your concerns about memory usage and performance are all valid. A solution is we could make VWA enabled by default bu...
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- > I can't make good reason why VWA is slower than FWA on your benchmark.
The only benchmark above where VWA is slo... -
- * Performance:
* P4. `GC.compact` can be slower than FWA because it should be copy the body. But maybe it is not a... -
- Thank you for your reply.
peterzhu2118 (Peter Zhu) wrote in #note-3:
> - The RString layout does not change much.... -
- Sorry for incremental questions.
Why do we need to enable it now? Current benchmark you showed illustrate not so dif... -
- Hi @ko1, thank you for the feedback.
- The RString layout does not change much. The only big change is that the le... -
- ko1 (Koichi Sasada) wrote in #note-1:
> * Could you explain the variable size page strategy? https://bugs.ruby-lang.... -
- Thank you for your work. I have several questions.
* Could you explain the RString layout?
* Could you explain th... -
- # GitHub PR: https://github.com/ruby/ruby/issues/4933
# Feature description
Since merging #18045 which introduc... -
- - [Feature #18239] Variable Width Allocation: Strings
- Discuss deployment schedule and binary incompatibility iss... -
- Solaris CI still has a problem even with these commits, so it doesn't
appear to fix the issue. Reverting both 84e8e2... -
- Some comments:
* For debugger, `Thread::Backtrace::Location#script_lines` is enough.
* If we introduce this featu... -
- I clarified a bit with @ko1.
First, `script_lines` returns all lines, not the lines of a specific method (I missed t... -
- > For what else do you need to get the source? Ruby::AbstractSyntaxTree::Node?
> How do you get the Ruby::AbstractSy... -
- ko1 (Koichi Sasada) wrote in #note-13:
> Do you talking about `toSource` method in JS?
Yeah it's JS Function's `t... -
- Eregon (Benoit Daloze) wrote in #note-12:
> We already have something similar to "code locations" objects: `Thread::... -
- We already have something similar to "code locations" objects: `Thread::Backtrace::Location`.
We could add `#{first,... -
03:05 AM Feature #18231: `RubyVM.keep_script_lines`
- I don't want to bother progressing here, so I accept `RubyVM.keep_script_lines` with the indication of implementation...
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- For the `test-bundled-gems`, make `debug.so` with extconf.rb and
`make` command directly because `rake-compiler` assu... -
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05:07 PM Revision cbb11521 (git): Enabled to build extensions with the bundled gems
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- Applied in changeset commit:git|b44c5187b4d05d8644242e532f2243210d0b74df.
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Expose instruction information ... -
- Remove temporary skip of test_no_curdir to see if this fixes the
problem. -
- This appears to be only necessary on Solaris, but this commit
enables it unconditionally to test breakage. The follo... -
- 03:41 PM Revision aa2a1fb0 (git): * 2021-10-05 [ci skip]
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- * Split the sorting types into classes.
* Apply the same sorting to method sorting under the parallel
test. -
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- So that rubygems installer will work to build extension gems.
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- Extension gems will be installed by the installed standard
libraries. -
08:43 AM Bug #18238 (Third Party's Issue): CSV encoding issue with parsing from Zlib::GzipReader stream
- Could you open this on https://github.com/ruby/csv ? ruby/csv is the upstream of csv.
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08:41 AM Bug #18238 (Third Party's Issue): CSV encoding issue with parsing from Zlib::GzipReader stream
- Hi,
I found an issue with parsing CSVs directly from a `Zlib::GzipReader` IO which I am trying to debug. Unfortuna... -
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- From recent results, `check` and `test-all` will finish within 10
minutes on macOS or 30 minutes on MinGW, otherwise... -
- Closing since this seems not acceptable.
Feel free to reopen if any progress. -
- https://github.com/ruby/irb/commit/692eb9b9b5
10/03/2021
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11:21 PM Revision e54d1e99 (git): Move rb_ractor_p definition
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11:15 PM Revision 3f5b52bf (git): Function `w32_error` does not return
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- 03:14 PM Revision 76138316 (git): * 2021-10-04 [ci skip]
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- https://github.com/ruby/reline/commit/852e855d82
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01:16 PM
Bug #18237 (Closed): Remove unnecessary checks for `Time` in `Range#each` as per the comment
- Applied in changeset commit:git|fb03598666ddbb9f8b35eb4f599e75654ca7ca06.
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Remove unnecessary checks in `R... -
11:50 AM Bug #18237 (Closed): Remove unnecessary checks for `Time` in `Range#each` as per the comment
- In commit:7817a438eb1803e7b3358f43bd1f38479badfbdc, the implementation of `Time#succ`, which had been deprecated for ...
- 01:16 PM Revision fb035986 (git): Remove unnecessary checks in `Range#each` [Bug #18237]
- In commit:7817a438eb1803e7b3358f43bd1f38479badfbdc, the implementation
of `Time#succ`, which had been deprecated for ... -
- Applied in changeset commit:git|19f9d9cf739e7fc185ef90d5da5b4b12cf902a52.
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Remove extraneous conversion to... -
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12:51 PM Revision 853ca5cc (git): [ruby/irb] Remove `require` in signal handler to avoid ThreadError
- `rdoc` has been required so it looks unnecessary
https://github.com/ruby/irb/commit/5f749c613c -
- https://github.com/ruby/reline/commit/12ea63e6e0
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- https://github.com/ruby/irb/commit/15bcbbb284
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- https://github.com/ruby/irb/commit/800e83eabd
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- https://github.com/ruby/reline/commit/1c6c0c82f0
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- https://github.com/ruby/reline/commit/b42c0980d9
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- I forgot to mention, it's also much better if all instances of a class (and potential subclasses) are immutable, if o...
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- I think nobody expects #freeze or #deep_freeze to ever freeze (non-singleton) classes/modules, so IMHO these methods ...
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- duerst (Martin Dürst) wrote in #note-8:
> Can you say exactly what the problem is? Is it that the file may get chang... -
- ko1 (Koichi Sasada) wrote in #note-6:
> > I would think having code_location on exceptions and methods is also enoug... -
- Eregon (Benoit Daloze) wrote in #note-5:
> I am strongly against this proposal as it currently stands.
> For `err... -
- https://github.com/ruby/reline/commit/1b00cae0fd
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- Applied in changeset commit:git|ea64e742f5feddbdfb6526cd0a54a9986097a34d.
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Revert "mkmf.rb: try linking at... -
- This reverts commit 524513be399e81bb170ec88aa0d501f33cbde8c3,
which can return false positive by existing but unusabl... -
07:33 AM Bug #18184: Wrong key for `ruby2_keywords_hash` flag
- ruby_3_0 f192e01233ccd7966721a164e62a86707b4e6d9e merged revision(s) 7c0230b05d0978958f89434c84ddd9c82419c1a5,552728a...
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- ruby_3_0 5341eca588e738cd5031ab7d8bb5c300471c00e9 merged revision(s) ddb32e66160ab50849419ef7c7ac584913b79c34.
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- Check the entire name as `ruby2_keywords_flag` [Bug #18184]
---
marshal.c | 2 +-
... -
- [Bug #18173] Update loaded_features_index
If $LOADED_FEATURES is changed in the just required file, also the... -
- https://github.com/ruby/reline/commit/b283791dc5
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- https://github.com/ruby/reline/commit/7fe9ecf945
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- https://github.com/ruby/reline/commit/5414a42b0e
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- If the argument prompt disappears when pasting is finished, rerender the
whole buffer.
https://github.com/ruby/relin... -
- https://github.com/ruby/reline/commit/65b27dd2ff
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05:26 AM Revision ef350b3a (git): [ruby/reline] Simplify SIGWINCH handler to avoid aborting when resizing.
- https://github.com/ruby/reline/commit/481add0537
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- https://github.com/ruby/reline/commit/2a60aacebb
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- https://github.com/ruby/reline/commit/179c52bca8
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- https://github.com/ruby/reline/commit/737b23beae
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- https://github.com/ruby/reline/commit/da35902d78
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- Because Ctrl+j and Enter are the same on Windows.
https://github.com/ruby/reline/commit/fa885ed449 -
- 02:23 AM Revision ceeae319 (git): Avoid using the altzone variable in AIX
- In AIX, altzone exists in the standard library but is not declared
in time.h. By 524513be399e81bb170ec88aa0d501f33cb... - 02:09 AM Revision 2962c421 (git): [DOC] fix small mistake in doc/marshal.rdoc [ci skip]
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10/02/2021
- 11:05 PM Revision 84267324 (git): * 2021-10-03 [ci skip]
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- Applied in changeset commit:git|79a4484a072e9769b603e7b4fbdb15b1d7eccb15.
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Do not load file with same real... -
- This fixes issues with paths being loaded twice in certain cases
when symlinks are used.
It took me multiple attempt... -
- Instead of relying on setting an unsetting ruby_verbose, which is
not thread-safe, restructure require_internal and l... -
- I agree `RubyVM` namespace is not portable, and not well-considered API.
So I think:
* Ruby users should not us... -
- > I would think having code_location on exceptions and methods is also enough for the debugger.
How to get the pro... -
- I am strongly against this proposal as it currently stands.
This is yet another hack added under RubyVM.
I think add... -
01:57 PM Bug #18236 (Closed): Conversion to float not working for object with to_f method
- Following code works on all previous versions (1.8.7-p375, 1.9.3-p551, 2.0.0-p648, 2.1.10, 2.2.10, 2.4.10, 2.5.9, 2.6...
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- [BCryptGenRandom] is available since Windows Vista / Windows
Server 2008.
Regarding [CryptGenRandom]:
> This API is ... -
10:58 AM Revision b8327fb8 (git): [ruby/reline] Refactoring Reline::Key.match? and add test.
- https://github.com/ruby/reline/commit/90e8999ae4
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- Applied in changeset commit:git|abc0304cb28cb9dcc3476993bc487884c139fd11.
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Avoid race condition in Regexp#... -
- In certain conditions, Regexp#match could return a MatchData with
missing captures. This seems to require at the lea... -
- Applied in changeset commit:git|d08721465850a6e6954b43bbfebe2ed5a7256dec.
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Restore Hash#compare_by_identit... -
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- ruby_3_0 efa1ba15fd5007210f819e6d11002ca829c989bf merged revision(s) fa05697e4832fbd67a4f91b9bb362471902faab3.
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- Use `%printer` directive for Bison 3.8
---
parse.y | 74 ++++++++++++++++++++++++++-----------------...
10/01/2021
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- The compilation time pragma seems not applied to inline functions
expanded by the link time optimization. The local ... -
- Treated:
#drop
#drop_while
#cycle -
- Treats:
#zip
#take
#take_while - 05:13 PM Revision eaeb0a00 (git): * 2021-10-02 [ci skip]
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04:39 PM Bug #18235 (Closed): try_var in mkmf.rb recognizes a variable that is not declared
- In 524513be399e81bb170ec88aa0d501f33cbde8c3, `try_var` in mkmf.rb has been modified to recognize a variable that exis...
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12:25 PM Bug #18156: 3.0.2 configuration checks by default for C++ compiler instead of C?
- Thank you for the patch to fix the warning about AC_C_BIGENDIAN.
For the patch `912a8dcfc5369d840dcd6bf0f88ee0bac7... -
- Applied in changeset commit:git|ca3cc677b31897e7306ac3b4565a0dd928168b08.
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Define ACTION-IF-UNIVERSAL of `... -
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- Applied in changeset commit:git|60d0421ca861944459f52292d65dbf0ece26e38a.
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Fix the encoding of loaded feat... -
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- The feature names loaded from the default load paths should also
be in the file system encoding. -
05:10 AM Feature #18228: Add a `timeout` option to `IO.copy_stream`
- "ioquatix (Samuel Williams)" <[email protected]> wrote:
> Just FYI: `sendfile` is less flexible and you should ... -
- "Eregon (Benoit Daloze)" <[email protected]> wrote:
> I wonder, can `sendfile(2)` be interrupted by a signal li... -
02:14 AM Revision 8e9d696e (git): Use macos-11 instead of macos-latest
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- https://github.blog/changelog/2021-09-29-github-actions-jobs-running-on-macos-latest-are-now-running-on-macos-big-sur...
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- As we do not use config.h.in, just define the helper macro
instead. -
- for debugger/error_highlight we need source code other than methods so `Method` is not enough.
I agree `Method#scrip...
09/30/2021
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11:38 PM Misc #18233: Intermediate Representation for Ruby's JIT
- > MIR is designed to be used for different languages, including C. Standard ruby methods implemented on C, e.g. times...
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- This is for discussing an IR design for Ruby's JIT. This thread is spun out from [Feature #18229] to let it focus on ...
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- Applied in changeset commit:git|1f5f8a187adb746b01cc95c3f29a0a355f513374.
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Make Array#min/max optimization... -
- Pass in ec to vm_opt_newarray_{max,min}. Avoids having to
call GET_EC inside the functions, for better performance.
... -
- Treats:
#each_with_index
#reverse_each
#each_entry
#each_slice
#each_cons
#each_with_object - 08:07 PM Revision 40ef0345 (git): * 2021-10-01 [ci skip]
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08:06 PM Revision bb488a1a (git): Use faster any_hash logic in rb_hash
- From the documentation of rb_obj_hash:
> Certain core classes such as Integer use built-in hash calculations and
> d... -
- byroot (Jean Boussier) wrote in #note-8:
> However if we use a signal to interrupt it (assuming it's possible, becau... -
- > Once a timeout occurs, are you sure we can make such a guarantee about the number of bytes that are copied reliably...
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10:02 AM Feature #18228: Add a `timeout` option to `IO.copy_stream`
- > As for the return value in case of a timeout, it is important to convey both that a timeout happened, and the numbe...
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- ko1 (Koichi Sasada) wrote in #note-2:
> It is ISeq/AST related API so it should be internal.
I don't see how it i... -
- > This new API must be implement-able for other Ruby implementations.
It is ISeq/AST related API so it should be i... -
- This new API must be implement-able for other Ruby implementations.
Hence, it must not be on `RubyVM`, and it should... -
- This ticket proposes the method `RubyVM.keep_script_lines` to manage the flag to keep the source code.
Now, `SCRIP... -
- `exit` after `binding.irb' calls IRB's `exit` and raises an error.
expected:
```ruby
# binding.irb
exit #=> t... -
- > Yes, please. It's always very interesting to follow discussions about how to make Ruby faster.
Created a new thr... -
02:44 PM Feature #18229: Proposal to merge YJIT
- The upstreaming work is now in progress and we've created a checklist:
https://github.com/Shopify/yjit/issues/257 -
01:45 PM Feature #18229: Proposal to merge YJIT
- maximecb (Maxime Chevalier-Boisvert) wrote in #note-9:
> I have looked at MIR and it looks close to machine code, t... -
- k0kubun (Takashi Kokubun) wrote in #note-10:
> > We should probably continue this specific thread of discussion by e... -
03:22 AM Feature #18229: Proposal to merge YJIT
- Great!
I'll release Ruby 3.1.0-preview1 after YJIT is merged! -
- https://github.com/ruby/ruby/pull/4866 was merged as commit:529fc204af84f825f98f83c34b004acbaa802615, closing.
- 02:50 PM Revision 529fc204 (git): marshal.c: don't call the proc with partially initialized objects. (#4866)
- For cyclic objects, it requires to keep a st_table of the partially
initialized objects. -
- > As vo.x (Vit Ondruch) says in comment #note-1, we must call AC_PROG_CC somewhere.
I see the following commit:git... -
- jaruga (Jun Aruga) wrote in #note-7:
> > When a C++ compiler is not installed, the ./configure fails. Is this a expe... -
- This was first reported as a Bootsnap bug: https://github.com/Shopify/bootsnap/issues/376
But I reduced it to:
... -
- Although `AC_PROG_CC_C99` has been obsolete, `AC_PROG_CC` is not
and the latter is necessary not to make C++ compiler... -
- Must not be a bad idea to improve documents.
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