traits with self-containing supertraits are not object safe #38603

arielb1 · 2016-12-25T17:57:14Z

This should be the last time I fix this function.

rust-highfive · 2016-12-25T17:57:18Z

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

arielb1 · 2016-12-25T17:58:23Z

This fixes the ICE, but we still permit stuff such as

trait Q<T:?Sized> {}
trait Foo where u32: Q<Self> {}

fn main() {
    let f: Box<Foo> = ...;
}

That shouldn't cause an ICE because non-supertrait bounds are never used, but I still think I should future-compatibility-warning this.

eddyb · 2016-12-25T20:36:31Z

cc @rust-lang/compiler @brson We should probably gate this on Crater.

arielb1 · 2016-12-25T23:39:01Z

The current patch is pretty non-aggressive, prohibiting only cases that tend to ICE. I think we want to crater a more aggressive version of it (cc #38604).

arielb1 · 2016-12-31T00:42:07Z

now ready for crater

nikomatsakis · 2017-01-02T20:17:02Z

cc @brson -- can you run this through craterbomb?

brson · 2017-01-03T21:45:07Z

I'll run it through crater. Cargobomb isn't quite ready for this yet.

brson · 2017-01-04T22:50:32Z

Still cratering.

brson · 2017-01-06T01:10:39Z

Crater says https://gist.github.com/anonymous/3409c01561daa0670445c1ac9f967f6b

Some false positives but some legit errors.

nikomatsakis · 2017-01-09T22:58:54Z

arielb1 · 2017-01-10T10:08:58Z

I am not sure what's behind the rmt_serialize errors, but resolution finishes before my new code runs so it shouldn't be me.

All other errors look spurious.

nikomatsakis · 2017-01-10T21:58:31Z

@arielb1

I am not sure what's behind the rmt_serialize errors, but resolution finishes before my new code runs so it shouldn't be me.

That is odd. Do you have a local build? Can you give this a spin locally?

This should be the last time I fix this function. Fixes rust-lang#38404.

Fixes rust-lang#38604 needs a crater run

arielb1 · 2017-01-10T22:44:29Z

Looks like not our bug.

Compiling using the Cargo.lock in the repository works and uses the following versions:

   Compiling byteorder v0.3.13
   Compiling libc v0.2.8
   Compiling rustc-serialize v0.3.18
   Compiling rmp v0.7.3
   Compiling log v0.3.5
   Compiling rmp-serialize v0.7.0
   Compiling neovim-lib v0.1.1 (file:///home/ariel/Rust/neovim-lib)

While after a cargo update, or on crater, the following versions are used, triggering the error with both nightly and modified rustc:

   Compiling byteorder v1.0.0
   Compiling byteorder v0.4.2
   Compiling num-traits v0.1.36
   Compiling log v0.3.6
   Compiling rustc-serialize v0.3.22
   Compiling rmp v0.7.5
   Compiling rmp v0.8.1
   Compiling rmp-serialize v0.7.0

nikomatsakis · 2017-01-11T17:21:54Z

Looks like not our bug.

So you get the same results both with and without this PR?

Since this is being used as a library, the Cargo.lock that is found in the repo isn't meaningful anyway. Cargo.lock is only respected for the final target, iiuc.

arielb1 · 2017-01-14T15:29:51Z

@nikomatsakis

Exactly. When you use the Cargo.lock from source control, it works with both the old and new rustcs, and when you cargo update, it does not work.

nikomatsakis · 2017-01-17T22:27:02Z

@arielb1 I'm sort of confused by what you meant when you wrote "not our bug"

arielb1 · 2017-01-18T06:24:32Z

@nikomatsakis

That's it's broken, but not by our changes.

nikomatsakis · 2017-01-19T08:17:14Z

OK, I misread this comment at first:

When you use the Cargo.lock from source control, it works with both the old and new rustcs, and when you cargo update, it does not work.

Interesting.

nikomatsakis · 2017-01-19T08:17:52Z

@bors r+

bors · 2017-01-19T08:17:53Z

📌 Commit c85fb19 has been approved by nikomatsakis

bors · 2017-01-19T23:49:03Z

⌛ Testing commit c85fb19 with merge 7da72d5...

bors · 2017-01-20T01:18:53Z

💔 Test failed - status-appveyor

alexcrichton · 2017-01-20T01:19:41Z

@bors: retry * canceled to prioritize rollup

…

On Thu, Jan 19, 2017 at 5:18 PM, bors ***@***.***> wrote: 💔 Test failed - status-appveyor <https://ci.appveyor.com/project/rust-lang/rust/build/1.0.1613> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#38603 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAD95DENPdPNi8xHTyEm6EcO3u42gkknks5rUAt_gaJpZM4LVciT> .

bors · 2017-01-20T01:41:29Z

⌛ Testing commit c85fb19 with merge 8fa0690...

bors · 2017-01-20T01:48:30Z

💔 Test failed - status-appveyor

alexcrichton · 2017-01-20T01:53:30Z

@bors: retry * network error

…

On Thu, Jan 19, 2017 at 5:48 PM, bors ***@***.***> wrote: 💔 Test failed - status-appveyor <https://ci.appveyor.com/project/rust-lang/rust/build/1.0.1615> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#38603 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAD95IYzwrk6ODaKeiwNaXS52qFQMT1Uks5rUBJwgaJpZM4LVciT> .

bors · 2017-01-20T02:35:13Z

⌛ Testing commit c85fb19 with merge 6be85b4...

bors · 2017-01-20T02:56:23Z

💔 Test failed - status-appveyor

alexcrichton · 2017-01-20T02:57:22Z

@bors: retry * canceled to prioritize rollup

…

On Thu, Jan 19, 2017 at 6:56 PM, bors ***@***.***> wrote: 💔 Test failed - status-appveyor <https://ci.appveyor.com/project/rust-lang/rust/build/1.0.1618> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#38603 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAD95JTCyLL3M3nF0MNYm7IdZTqSQTsNks5rUCJZgaJpZM4LVciT> .

bors · 2017-01-20T03:48:26Z

⌛ Testing commit c85fb19 with merge d38430b...

alexcrichton · 2017-01-20T03:49:24Z

@bors: retry

prioritizing rollup

bors · 2017-01-20T03:49:32Z

⌛ Testing commit c85fb19 with merge 5a6ac84...

alexcrichton · 2017-01-20T03:53:14Z

@bors: retry

bors · 2017-01-20T04:54:27Z

⌛ Testing commit c85fb19 with merge b53d374...

traits with self-containing supertraits are not object safe This should be the last time I fix this function. Fixes #38404.

bors · 2017-01-20T07:17:27Z

☀️ Test successful - status-appveyor, status-travis
Approved by: nikomatsakis
Pushing b53d374 to master...

Rollup of 28 pull requests - Successful merges: #38603, #38761, #38842, #38847, #38955, #38966, #39062, #39068, #39077, #39111, #39112, #39114, #39118, #39120, #39132, #39135, #39138, #39142, #39143, #39146, #39157, #39166, #39167, #39168, #39179, #39184, #39195, #39197 - Failed merges: #39060, #39145

rust-highfive assigned eddyb Dec 25, 2016

arielb1 force-pushed the supertrait-self-3 branch from 992789a to 5a9fa5d Compare December 25, 2016 18:11

arielb1 added I-needs-decision Issue: In need of a decision. and removed I-needs-decision Issue: In need of a decision. labels Dec 25, 2016

eddyb added the S-waiting-on-crater Status: Waiting on a crater run to be completed. label Dec 25, 2016

Ariel Ben-Yehuda and others added 2 commits January 11, 2017 00:02

traits with self-containing supertraits are not object safe

4f542f9

This should be the last time I fix this function. Fixes rust-lang#38404.

forbid all self-referencing predicates

c85fb19

Fixes rust-lang#38604 needs a crater run

arielb1 force-pushed the supertrait-self-3 branch from ec742c6 to c85fb19 Compare January 10, 2017 22:02

bors added a commit that referenced this pull request Jan 20, 2017

Auto merge of #38603 - arielb1:supertrait-self-3, r=nikomatsakis

b53d374

traits with self-containing supertraits are not object safe This should be the last time I fix this function. Fixes #38404.

bors merged commit c85fb19 into rust-lang:master Jan 20, 2017

traits with self-containing supertraits are not object safe #38603

traits with self-containing supertraits are not object safe #38603

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arielb1 commented Dec 25, 2016 •

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