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Implement RFC 1268 "Allow overlapping implementations for marker traits" #41309

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merged 7 commits into from
Apr 15, 2017

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Rebased version of #40097.

Tracking issue: #29864.

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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @eddyb (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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@frewsxcv frewsxcv mentioned this pull request Apr 15, 2017
@frewsxcv frewsxcv force-pushed the sg-implement-rfc-1268 branch from fd5d164 to 075b4ab Compare April 15, 2017 00:41
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frewsxcv commented Apr 15, 2017

Considering @nikomatsakis already approved #40097 and all I did was rebase and add an unstable book entry, I hope I'm not overstepping my bounds just to do:

@bors r=nikomatsakis

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bors commented Apr 15, 2017

📌 Commit 075b4ab has been approved by nikomatsakis

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bors commented Apr 15, 2017

💡 This pull request was already approved, no need to approve it again.

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bors commented Apr 15, 2017

📌 Commit 075b4ab has been approved by nikomatsakis

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bors commented Apr 15, 2017

🔒 Merge conflict

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bors commented Apr 15, 2017

☔ The latest upstream changes (presumably #41305) made this pull request unmergeable. Please resolve the merge conflicts.

sgrif and others added 7 commits April 14, 2017 22:04
This patch allows overlap to occur between any two impls of a trait for
traits which have no associated items.

Several compile-fail tests around coherence had to be changed to add at
least one item to the trait they test against.

Ref rust-lang#29864
I've added some explicit tests that negative impls are allowed to
overlap, and also to make sure that the feature doesn't interfere with
specialization. I've not added an explicit test for positive overlapping
with negative, as that's already tested elsewhere.
@frewsxcv frewsxcv force-pushed the sg-implement-rfc-1268 branch from 075b4ab to ae9f571 Compare April 15, 2017 02:05
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Rebased.

@bors r=nikomatsakis

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bors commented Apr 15, 2017

📌 Commit ae9f571 has been approved by nikomatsakis

frewsxcv added a commit to frewsxcv/rust that referenced this pull request Apr 15, 2017
…ikomatsakis

Implement RFC 1268.

Rebased version of rust-lang#40097.

Tracking issue: rust-lang#29864.
bors added a commit that referenced this pull request Apr 15, 2017
Rollup of 2 pull requests

- Successful merges: #41125, #41309
- Failed merges:
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bors commented Apr 15, 2017

⌛ Testing commit ae9f571 with merge be1a74e...

@bors bors merged commit ae9f571 into rust-lang:master Apr 15, 2017
@petrochenkov petrochenkov changed the title Implement RFC 1268. Implement RFC 1268 "Allow overlapping implementations for marker traits" Apr 15, 2017
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[meta] I've edited the PR name to include the RFC name.
Maybe CONTRIBUTING.md should tell people not to name PRs like "Fix #12345", but I'm not sure anybody reads it :(

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@frewsxcv thanks for adding the book entry! I've been hoping to get to that.

@frewsxcv frewsxcv deleted the sg-implement-rfc-1268 branch April 18, 2017 14:49
@Centril Centril added the F-marker_trait_attr `#![feature(marker_trait_attr)]` label Jan 9, 2020
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