[E0183] Add missing error code explanation #63022

Karrq · 2019-07-26T19:45:44Z

This is the continuation of #61225

CC #61137

Let me know if there's anything that needs change

This is part of the ongoing work for #61137

rust-highfive · 2019-07-26T19:45:48Z

Some changes occurred in diagnostic error codes

cc @GuillaumeGomez

rust-highfive · 2019-07-26T19:45:49Z

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @varkor (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 Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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.

Please see the contribution instructions for more information.

src/librustc_typeck/error_codes.rs

rust-highfive · 2019-07-26T20:05:40Z

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2019-07-26T19:46:20.0780415Z ##[command]git remote add origin https://github.com/rust-lang/rust
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2019-07-26T19:53:23.2054365Z     Finished release [optimized] target(s) in 1m 28s
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2019-07-26T19:53:23.3655914Z tidy error: /checkout/src/librustc_typeck/error_codes.rs:1592: trailing whitespace
2019-07-26T19:53:23.3656849Z tidy error: /checkout/src/librustc_typeck/error_codes.rs:1596: trailing whitespace
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src/librustc_typeck/error_codes.rs

GuillaumeGomez

Good work, but not in the expected order. 😄 So, beyond my small fix requests, the global format of the explanation isn't "good". Steps:

First you should state what the error.
Followed then by "Erroneous code example:".
Then comes the erroneous code example.
Here goes the explanation of the error and how to solve it.
Here comes the fixed code example from 3..

Also, please remember that those long error explanations are not only rendered into html but can also be seen into terminals when running rustc --explain [ERROR CODE] (which explains why I asked you to put empty lines before code blocks).

src/librustc_typeck/error_codes.rs

Karrq · 2019-07-26T20:12:28Z

I tried to gather info from the surrounding errors about the format to follow but I wasn't really able.
Thanks for the complete explanation, I'll reformat the error to adhere to your guidelines

Karrq · 2019-07-26T20:23:05Z

I was wondering tho, what's the actual error? When is this error emitted?
I don't seem to be able to get the compiler to emit the error...

Using self doesn't emit any error, and actually works... bug?
Not providing the tuple argument ICEs on cargo run.
Not adding the feature gate emits E0658.

rust-highfive · 2019-07-26T20:31:37Z

The job x86_64-gnu-llvm-6.0 of your PR failed (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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2019-07-26T20:18:24.7679924Z    Compiling serde_json v1.0.40
2019-07-26T20:18:29.1322223Z    Compiling tidy v0.1.0 (/checkout/src/tools/tidy)
2019-07-26T20:18:37.8355605Z     Finished release [optimized] target(s) in 1m 30s
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2019-07-26T20:18:38.0009820Z tidy error: /checkout/src/librustc_typeck/error_codes.rs:1592: trailing whitespace
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2019-07-26T20:18:39.7318078Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test src/tools/tidy
2019-07-26T20:18:39.7318210Z Build completed unsuccessfully in 0:01:33
2019-07-26T20:18:39.7318210Z Build completed unsuccessfully in 0:01:33
2019-07-26T20:18:41.0684123Z ##[error]Bash exited with code '1'.
2019-07-26T20:18:41.0717667Z ##[section]Starting: Checkout
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GuillaumeGomez · 2019-07-27T09:53:38Z

I was wondering tho, what's the actual error? When is this error emitted?
I don't seem to be able to get the compiler to emit the error...

@Karrq That's part of why we ask to show the error. It also helps to check that the error is still emitted. It's however a bit surprising that the error doesn't show up... I can only recommend you to take a look at how it's emitted in the compiler (generally it's not very complicated). Look for the error code directly.

If you still can't figure out, maybe you can give a try to another error code?

Karrq · 2019-07-27T14:37:57Z

@GuillaumeGomez I was able to figure out when the error is supposed to be emitted: librustc_typeck::coherence::enforce_trait_manually_implementable, and it should be emitted when the user tries to implement any of the Fn* traits manually (line 78 of mod.rs). I tried doing that but I wasn't able to get it to produce the error, again.

Upon digging more (searching rust-call ABI is subject to change) I was able to find some tests run for this feature. One of these files does the test to check what errors are emitted when trying to manually implement the Fn* traits (src/test/compile-fail/feature-gate-unboxed-closures-manual-impls.rs). As can be seen in the file there's a note that specifies that the error never triggers because other errors are raised before that. That note has been there since commit 09783d1dab, dated Jan 12 2015.

I believe there's no way from us to trigger this specific error, yet. Nevertheless, now that I know what's supposed to emit this error I'll update the description accordingly in the next commit.

Karrq · 2019-07-27T17:01:49Z

According to the unstable book, unboxed_closures should be used to enable the user to use the "rust-call" ABI, but the compiler suggests to enable fn_traits instead.

From what I gathered:

E0183 should tell the user to enable fn_traits since it's emitted when checking for the Fn* traits.
When trying to use the "rust-call" ABI, the compiler should suggest to enable unboxed_closures. I wasn't enable to find where this error is emitted.

previous guidelines followed regarding formatting

rust-highfive · 2019-07-27T19:39:14Z

The job x86_64-gnu-llvm-6.0 of your PR failed (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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2019-07-27T17:39:07.0319721Z ##[command]git remote add origin https://github.com/rust-lang/rust
2019-07-27T17:39:07.0544298Z ##[command]git config gc.auto 0
2019-07-27T17:39:07.0613482Z ##[command]git config --get-all http.https://github.com/rust-lang/rust.extraheader
2019-07-27T17:39:07.0675644Z ##[command]git config --get-all http.proxy
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2019-07-27T19:16:43.1729180Z .............thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/libcore/result.rs:1084:5
2019-07-27T19:16:43.1740766Z ....thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: "SendError(..)"', src/libcore/result.rs:1084:5
2019-07-27T19:16:43.1741721Z thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/libcore/result.rs:1084:5
2019-07-27T19:16:43.1770448Z ..............thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/libcore/result.rs:1084:5
2019-07-27T19:16:43.4116720Z ...................................thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/libcore/result.rs:1084:5
2019-07-27T19:16:43.4140447Z ....thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: "SendError(..)"', src/libcore/result.rs:1084:5
2019-07-27T19:16:43.4149924Z thread '<unnamed>.' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/libcore/result.rs:1084:5
2019-07-27T19:16:43.4178211Z ......thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: RecvError', src/libcore/result.rs:1084:5
2019-07-27T19:16:45.4949196Z ...............thread '<unnamed>' panicked at 'explicit panic', src/libstd/sync/mutex.rs:629:13
2019-07-27T19:16:45.4959746Z ..thread '<unnamed>' panicked at 'test panic in inner thread to poison mutex', src/libstd/sync/mutex.rs:584:13
2019-07-27T19:16:45.4966482Z ...thread '<unnamed>' panicked at 'test panic in inner thread to poison mutex', src/libstd/sync/mutex.rs:561:13
2019-07-27T19:16:45.4971555Z .thread '<unnamed>' panicked at 'explicit panic', src/libstd/sync/mutex.rs:689:13
---
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---
2019-07-27T19:38:19.9517353Z Testing error-index stage2
2019-07-27T19:38:19.9668079Z doc tests for: /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md
2019-07-27T19:38:54.0607076Z 
2019-07-27T19:38:54.0607285Z 
2019-07-27T19:38:54.0608274Z command did not execute successfully: "/checkout/obj/build/bootstrap/debug/rustdoc" "--test" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md" "--test-args" ""
2019-07-27T19:38:54.0631598Z 
2019-07-27T19:38:54.0632739Z stdout ----
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2019-07-27T19:38:54.0633115Z running 712 tests
---
2019-07-27T19:38:54.0929671Z test /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0732 (line 11888) ... ok
2019-07-27T19:38:54.0929713Z 
2019-07-27T19:38:54.0929764Z failures:
2019-07-27T19:38:54.0929788Z 
2019-07-27T19:38:54.0930048Z ---- /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0183 (line 2954) stdout ----
2019-07-27T19:38:54.0930259Z error[E0658]: use of unstable library feature 'fn_traits'
2019-07-27T19:38:54.0930493Z   --> /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md:2960:5
2019-07-27T19:38:54.0930535Z    |
2019-07-27T19:38:54.0930748Z 8  | /     extern "rust-call" fn call_once(self, args: (A,)) -> Self::Output {
2019-07-27T19:38:54.0930805Z 9  | |         args.0
2019-07-27T19:38:54.0930876Z    | |_____^
2019-07-27T19:38:54.0930926Z    |
2019-07-27T19:38:54.0930926Z    |
2019-07-27T19:38:54.0931259Z    = note: for more information, see ***/issues/29625
2019-07-27T19:38:54.0931309Z    = help: add `#![feature(fn_traits)]` to the crate attributes to enable
2019-07-27T19:38:54.0931933Z error: aborting due to previous error
2019-07-27T19:38:54.0931966Z 
2019-07-27T19:38:54.0932283Z For more information about this error, try `rustc --explain E0658`.
2019-07-27T19:38:54.0932283Z For more information about this error, try `rustc --explain E0658`.
2019-07-27T19:38:54.0932354Z Some expected error codes were not found: ["E0183"]
2019-07-27T19:38:54.0932422Z failures:
2019-07-27T19:38:54.0932711Z     /checkout/obj/build/x86_64-unknown-linux-gnu/test/error-index.md - Rust_Compiler_Error_Index::E0183 (line 2954)
2019-07-27T19:38:54.0932761Z 
2019-07-27T19:38:54.0932807Z test result: FAILED. 687 passed; 1 failed; 24 ignored; 0 measured; 0 filtered out
---
2019-07-27T19:38:54.0933115Z 
2019-07-27T19:38:54.0933140Z 
2019-07-27T19:38:54.0933185Z failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
2019-07-27T19:38:54.0933247Z Build completed unsuccessfully in 1:51:43
2019-07-27T19:38:54.9879298Z ##[error]Bash exited with code '1'.
2019-07-27T19:38:54.9920545Z ##[section]Starting: Checkout
2019-07-27T19:38:54.9922952Z ==============================================================================
2019-07-27T19:38:54.9923014Z Task         : Get sources
2019-07-27T19:38:54.9923064Z Description  : Get sources from a repository. Supports Git, TfsVC, and SVN repositories.

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 @TimNN. (Feature Requests)

varkor · 2019-07-28T19:53:13Z

r? @GuillaumeGomez

JohnTitor · 2019-08-04T08:26:10Z

Ping from triage: @Karrq and @GuillaumeGomez any updates on this?

GuillaumeGomez · 2019-08-04T08:32:08Z

I'm waiting on @Karrq. :)

Karrq · 2019-08-04T08:38:33Z

Doesn't look like that to me. I added 2 comments to the issue and a commit based on those comments. Haven't received a review/reply since.

I see that github says that there are changes requested, but I can't figure out how to remove that since the changes have happened.

@GuillaumeGomez @JohnTitor

Karrq

Outdated

Karrq · 2019-08-04T14:33:50Z

So, @GuillaumeGomez, as I commented previously there are some concerns that I think need to be discussed.

I'd like to know what you are waiting on me for. Is is the build errors for the pipeline? If that's so I'd like some guidance on how to resolve them, since I'm not able to figure out why they are being generated in the first place.

GuillaumeGomez · 2019-08-05T08:29:38Z

The error index aren't generated automatically, when you generate a new compiler error, you create a new error index alongside and normally you also provide the long error explanation (and a test where the error is checked to be emitted). It's possible that the path to the error isn't possible anymore and then you should just try your luck with another error code (one which has a test).

hdhoang · 2019-08-16T01:44:54Z

ping from triage @Karrq, any updates on this? Thanks for your time!

Karrq · 2019-08-16T10:46:56Z

Unfortunately I've been very busy recently and couldn't really take a look at the error index, but since the error itself doesn't seem to be able to be emitted I don't think there's much more I can do

JohnCSimon · 2019-08-24T00:05:39Z

From triage:
Thank you for the update.
@Karrq @GuillaumeGomez

GuillaumeGomez · 2019-08-30T08:58:14Z

I'll need to check later in the future.

JohnCSimon · 2019-09-07T01:40:51Z

Ping from triage:
@Karrq @GuillaumeGomez Can you please resolve the failed checks?
Thank you.

JohnTitor · 2019-09-15T03:24:31Z

Ping from triage: @Karrq @GuillaumeGomez any updates on this?

joelpalmer · 2019-09-23T10:18:27Z

Ping from Triage: @Karrq we are closing this due to inactivity. However, when you have updates, please re-open. Thank you for the PR.

ewk and others added 2 commits May 26, 2019 22:26

Add missing error code explanation for E0183

69db412

This is part of the ongoing work for #61137

Completed E0183 as per review

08b8b7d

rust-highfive assigned varkor Jul 26, 2019

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 26, 2019