Use min_specialization in libcore #73565

matthewjasper · 2020-06-20T22:15:58Z

Getting TrustedRandomAccess to work is the main interesting thing here.

get_unchecked is now an unstable, hidden method on Iterator
The contract for TrustedRandomAccess is made clearer in documentation
Fixed a bug where Debug would create aliasing references when using the specialized zip impl
Added tests for the side effects of next_back and nth.

closes #68536

rust-highfive · 2020-06-20T22:16:01Z

r? @cramertj

(rust_highfive has picked a reviewer for you, use r? to override)

nagisa

Only made a very basic initial pass, got distracted before I could go through the whole PR.

src/libcore/str/mod.rs

nagisa · 2020-06-21T12:44:48Z

src/libcore/iter/adapters/zip.rs

+#[doc(hidden)]
+#[unstable(feature = "trusted_random_access", issue = "none")]
+#[rustc_specialization_trait]
+pub unsafe trait TrustedRandomAccess: Sized {


Why does this need to become pub?

It's now used in the interface of Iterator

nagisa · 2020-06-21T12:47:31Z

src/libcore/iter/adapters/zip.rs

+///
+/// `size` may not be overridden.
+///
+/// `<Self as Iterator>::get_unchecked` must be overridden. It must be safe to


Given that the default implementation simply panic!()s, this is not an unsafety invariant, is it?

bors · 2020-06-23T11:52:36Z

☔ The latest upstream changes (presumably #73643) made this pull request unmergeable. Please resolve the merge conflicts.

Muirrum · 2020-07-09T14:15:51Z

@rustbot modify labels to: +S-waiting-on-author -S-waiting-on-review

JohnTitor · 2020-08-05T02:49:23Z

Let's r? @nagisa as they left some review comments.

nagisa

@bors r+

nagisa · 2020-08-16T21:54:53Z

src/libcore/tests/iter.rs

+    assert_eq!(iter.next_back(), Some((40, 5000)));
+    assert_eq!(iter.next_back(), Some((30, 4000)));
+    assert_eq!(a, vec![6, 5, 4, 3]);
+    assert_eq!(b, vec![800, 700, 600, 500, 400]);


Do we actually want to enforce that the 2nd iterator consumes 1 more value than from the first iterator? I think this could go either way, but I would at least leave a comment to that effect so that a change in this behaviour wouldn’t immediately appear invalid.

nagisa · 2020-08-16T22:07:52Z

Oh well, this will need a rebase, but r=me once that's done.

Sorry for taking so long to get around to this.

matthewjasper · 2020-08-19T21:04:47Z

@bors r=nagisa

bors · 2020-08-19T21:04:48Z

📌 Commit dbad8c9 has been approved by nagisa

bors · 2020-08-19T22:21:50Z

⌛ Testing commit dbad8c9 with merge 1dc99bb058f144c8f4f64b005e546c10f301901b...

rust-log-analyzer · 2020-08-19T22:47:22Z

The job mingw-check of your PR failed (pretty log, raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

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Build completed successfully in 0:02:10
+ /scripts/validate-toolstate.sh
Cloning into 'rust-toolstate'...
<Nothing changed>
Traceback (most recent call last):
  File "../../src/tools/publish_toolstate.py", line 283, in <module>
    validate_maintainers(repo, github_token)
  File "../../src/tools/publish_toolstate.py", line 84, in validate_maintainers
    'Accept': 'application/vnd.github.hellcat-preview+json',
  File "/usr/lib/python3.6/urllib/request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/usr/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.6/urllib/request.py", line 570, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden
  local time: Wed Aug 19 22:47:09 UTC 2020
  network time: Wed, 19 Aug 2020 22:47:09 GMT
== end clock drift check ==
== end clock drift check ==
##[error]Process completed with exit code 1.
Terminate orphan process: pid (6409) (node)
Terminate orphan process: pid (6433) (python)

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @rust-lang/infra. (Feature Requests)

bors · 2020-08-19T22:48:37Z

💔 Test failed - checks-actions

matthewjasper · 2020-08-20T06:47:14Z

@bors retry

bors · 2020-08-20T07:12:59Z

⌛ Testing commit dbad8c9 with merge 2f15b6b842776d00d2eb9369deeb7dcd1b3a3baa...

bors · 2020-08-20T09:22:32Z

💔 Test failed - checks-azure

matthewjasper · 2020-08-20T12:04:03Z

@bors retry

bors · 2020-08-20T23:05:37Z

⌛ Testing commit dbad8c9 with merge d9d4d39...

bors · 2020-08-21T00:57:11Z

☀️ Test successful - checks-actions, checks-azure
Approved by: nagisa
Pushing d9d4d39 to master...

the8472 · 2021-01-03T20:36:20Z

@matthewjasper I'm currently thinking how to extend TrustedRandomAccess to drop types, one piece I am currently not understanding is why __iterator_get_unchecked was moved from TrustedRandomAccess to Iterator but not its other methods.

matthewjasper · 2021-01-10T20:06:38Z

__iterator_get_unchecked was moved because it sometimes needs the bounds on the Iterator impl. The other methods were not because I wanted to minimize what was added to Iterator.

rust-highfive assigned cramertj Jun 20, 2020

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 20, 2020

nagisa reviewed Jun 21, 2020

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rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 9, 2020

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matthewjasper added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 25, 2020

rust-highfive assigned nagisa and unassigned cramertj Aug 5, 2020

nagisa approved these changes Aug 16, 2020

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matthewjasper force-pushed the core-min-spec branch from 66b60da to 1a4d826 Compare August 17, 2020 19:14

Use min_specialization in libcore

dbad8c9

matthewjasper force-pushed the core-min-spec branch from 1a4d826 to dbad8c9 Compare August 19, 2020 19:08

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 19, 2020

bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Aug 19, 2020

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 20, 2020

bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Aug 20, 2020

bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Aug 20, 2020

bors added the merged-by-bors This PR was explicitly merged by bors. label Aug 21, 2020

bors mentioned this pull request Aug 21, 2020

specialize some collection and iterator operations to run in-place #70793

Merged

bors merged commit d9d4d39 into rust-lang:master Aug 21, 2020

matthewjasper deleted the core-min-spec branch August 21, 2020 07:06

cuviper added a commit to cuviper/rust that referenced this pull request Sep 5, 2020

Move ArrayChunksMut::get_unchecked per rust-lang#73565

86b9f71

cuviper mentioned this pull request Sep 5, 2020

Add slice::array_chunks_mut #75021

Merged

tesuji mentioned this pull request Sep 8, 2020

regression: get_unchecked resolves to unstable feature use #76479

Closed

steffahn mentioned this pull request Jun 1, 2021

Fix typo in internal documentation for TrustedRandomAccess #85888

Merged

the8472 mentioned this pull request Feb 5, 2023

Improve the array::map codegen #107634

Merged

cuviper added this to the 1.47.0 milestone May 2, 2024

workingjubilee added the F-min_specialization `#![feature(min_specialization)]` label Oct 1, 2024

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Use min_specialization in libcore #73565

Use min_specialization in libcore #73565

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Use min_specialization in libcore #73565

Use min_specialization in libcore #73565

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