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Better errors when a Copy impl on a Struct is not self-consistent #94249

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merged 1 commit into from
Mar 24, 2022
Merged

Better errors when a Copy impl on a Struct is not self-consistent #94249

merged 1 commit into from
Mar 24, 2022

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@compiler-errors compiler-errors commented Feb 22, 2022 •
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As discovered in a Zulip thread with @nnethercote and @Mark-Simulacrum, it's not immediately obvious why a field on an ADT doesn't implement Copy. This PR attempts to give slightly more detailed information by spinning up a fulfillment context to try to dig down and discover transitive fulfillment errors that cause is_copy_modulo_regions to fail on a ADT field.

The error message still kinda sucks, but should only show up in the case that an existing error message was totally missing... so I think it's a good compromise for now?

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Feb 22, 2022
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r? @davidtwco

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 22, 2022
davidtwco
davidtwco requested changes Mar 1, 2022
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Apologies for the slow review, I think this is a sensible change and looks good. I've left a small comment, if it seems feasible to fix without a lot more work then we can do that before landing this, otherwise it can be a follow-up.

@davidtwco davidtwco 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 Mar 1, 2022
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@rustbot ready

I left a FIXME, but otherwise just rebased this code.

@rustbot rustbot 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 Mar 23, 2022
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@bors r+

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bors commented Mar 23, 2022

📌 Commit c8cbd3d has been approved by davidtwco

@bors 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 Mar 23, 2022
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bors commented Mar 23, 2022

⌛ Testing commit c8cbd3d with merge 5114b946e9d2e10226feb30bec8c2f2e24fe3113...

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bors commented Mar 23, 2022

💔 Test failed - checks-actions

@bors 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 Mar 23, 2022
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The job armhf-gnu failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot) 
failures:

---- [ui] ui/imports/glob-use-std.rs stdout ----

error: error pattern 'panic works' not found!
command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/remote-test-client" "run" "0" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/imports/glob-use-std/a"
--- stdout -------------------------------
uploaded "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/imports/glob-use-std/a", waiting for result
------------------------------------------
------------------------------------------
--- stderr -------------------------------
thread 'main' panicked at 'client.read_exact(&mut header) failed with Connection reset by peer (os error 104)', src/tools/remote-test-client/src/main.rs:310:9
------------------------------------------

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can someone bors-retry this? spurious error it seems.

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@bors retry

@bors 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 Mar 23, 2022
@matthiaskrgr matthiaskrgr mentioned this pull request Mar 23, 2022
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bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 23, 2022
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Auto merge of rust-lang#95250 - matthiaskrgr:rollup-ma4zl69, r=matthi…
37b55c8 
…askrgr

Rollup of 5 pull requests

Successful merges:

 - rust-lang#94249 (Better errors when a Copy impl on a Struct is not self-consistent)
 - rust-lang#95069 (Fix auto traits in rustdoc)
 - rust-lang#95221 (interpret/memory: simplify check_and_deref_ptr)
 - rust-lang#95225 (remove `[async output]` from `impl Future` pretty-printing)
 - rust-lang#95238 (Stop emitting E0026 for struct enums with underscores)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit af19a50 into rust-lang:master Mar 24, 2022
@rustbot rustbot added this to the 1.61.0 milestone Mar 24, 2022
@compiler-errors compiler-errors deleted the better-copy-errors branch April 7, 2022 04:33
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