jiebi/CodeConvo huggingface dataset:
Change:
<ins> error[E0277]: the trait bound `&T: std::io::Read` is not satisfied --> $DIR/suggest-change-mut.rs:12:48 | LL |         let mut stream_reader = BufReader::new(&stream); |                                                ^^^^^^^ the trait `std::io::Read` is not implemented for `&T` | = note: required by `BufReader::<R>::new` help: consider removing the leading `&`-reference | LL |         let mut stream_reader = BufReader::new(stream); |                                               -- help: consider changing this borrow's mutability | LL |         let mut stream_reader = BufReader::new(&mut stream); |                                                ^^^^ error[E0599]: the method `read_until` exists for struct `BufReader<&T>`, but its trait bounds were not satisfied --> $DIR/suggest-change-mut.rs:16:23 | LL |         stream_reader.read_until(b'n', &mut buffer).expect("Reading into buffer failed"); |                       ^^^^^^^^^^ method cannot be called on `BufReader<&T>` due to unsatisfied trait bounds | ::: $SRC_DIR/std/src/io/buffered/bufreader.rs:LL:COL | LL | pub struct BufReader<R> { | ----------------------- doesn't satisfy `BufReader<&T>: BufRead` | = note: the following trait bounds were not satisfied: `&T: std::io::Read` which is required by `BufReader<&T>: BufRead` error: aborting due to 2 previous errors Some errors have detailed explanations: E0277, E0599. For more information about an error, try `rustc --explain E0277`. </ins>

Discussion:
: We currently emit: What is likely desired instead is to use . Seen in the wild at <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
claim
Change:
if let ExprKind::Block(_, None) = right.kind => { self.sess.emit_err(IfExpressionMissingThenBlock { if_span: lo, <del> sub: IfExpressionMissingThenBlockSub::UnfinishedCondition( cond_span.shrink_to_lo().to(*binop_span) ), </del> <ins> missing_then_block_sub: IfExpressionMissingThenBlockSub::UnfinishedCondition(cond_span.shrink_to_lo().to(*binop_span)), let_else_sub: None, </ins> }); std::mem::replace(right, this.mk_expr_err(binop_span.shrink_to_hi())) },

Discussion:
<!-- Thank you for filing a bug report! Please provide a short summary of the bug, along with any information you feel relevant to replicating the bug. If you cannot produce a minimal reproduction case (something that would work in isolation), please provide the steps or even link to a repository that causes the problematic output to occur. --Given the following code: The current output is: <!-- The following is not always necessary. --Ideally the output should suggest removing the additional keyword in front of the . This mistake can occur due to muscle memory as , , and in the future are somewhat similar syntactically. Thanks. label +D-confusing +F-let-else <!-- If the problem is not self-explanatory, please provide a rationale for the change. --<!-- If dramatically different output is caused by small changes, consider also adding them here. If you're using the stable version of the compiler, you should also check if the bug also exists in the beta or nightly versions. The output might also be different depending on the Edition. --<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
I think the current suggestion is valid. Because one writes instead of writing . So the suggestion if changed maybe fall-negative.
We should likely add an alternative suggestion to remove the , but keep both. I think that the current suggestion is likely going to be the more common situation, so it should still come first.
claim
What would be the best way to go about adding an alternate suggestion? I'd like to try my hand at this. What I think needs to be done is adding help text to , add a variant to , and then add something to to add the alternate after the primary suggestion. Is this a good starting point?
it sounds like you are in the right path.
I looked a bit into this issue and have already found where to add text to the and the as mentioned, but i am a bit overwhelmed how and where to start in the in the . Does anyone have a hint for me?
claim
claim
You can add instructions in the parser to track your progress.

I'm not sure about the specifics out of the top of my head here of what type each step in the parse is, but you will have successfully parsed the , the condition and then you'll encounter an token when a body/block was expected. That's where the new recovery should kick in, pointing at the span saying that you might want to remove it.
claim
Change:
ex = ExprBreak(None); } hi = self.last_span.hi; <ins> } else if self.token.is_keyword(keywords::Let) { // Catch this syntax error here, instead of in `check_strict_keywords`, so // that we can explicitly mention that let is not to be used as an expression let mut db = self.fatal("expected expression, found statement (`let`)"); db.note("variable declaration using `let` is a statement"); return Err(db); </ins> } else if self.check(&token::ModSep) || self.token.is_ident() && !self.check_keyword(keywords::True) &&

Discussion:
This code isn't valid Rust: We have an okay, but not great, diagnostic here: It might be nice to add a when the keyword found is that mentions that is not an expression, and so cannot be used in this way.
want to work on this? It's a similar task to the other doc comment one, but much simpler since it's a very specific situation.
I'd be happy to help someone :)
So, the parser already has its ways to differentiate keywords from identifiers. All we have to do is find the right place where that error is thrown, check whether it's a and add a note along with the error. The parser has all sorts of code, and adding a note's also around there somewhere :) Code:
I would like to try this. :)
Awesome! Feel free to ask waffles or me for help (you can find us both on IRC on #rust-internals), or ask questions here. (self-assigning since I can't assign to you -- just to mark it as "being taken")
Change:
match self.size_and_align_of(metadata, &field)? { Some(size_and_align) => size_and_align, None => { <del> // A field with extern type.  If this field is at offset 0, we behave // like the underlying extern type. // FIXME: Once we have made decisions for how to handle size and alignment // of `extern type`, this should be adapted.  It is just a temporary hack // to get some code to work that probably ought to work. if sized_size == Size::ZERO { return Ok(None); } else { span_bug!( self.cur_span(), "Fields cannot be extern types, unless they are at offset 0" ) } </del> <ins> // A field with an extern type. We don't know the actual dynamic size // or the alignment. return Ok(None); </ins> } };

Discussion:
A slightly different reproducer that doesn't rely on constant propagation pass, and so should be more robust: label +A-const-eval +F-extern_types
Error: Malformed in master branch. missing field for key at line 156 column 1 Please let know if you're having trouble with this bot.
Change:
[few] hir_definitions: rustc_hir::definitions::Definitions, [] hir_owner: rustc_middle::hir::Owner<$tcx>, [] hir_owner_nodes: rustc_middle::hir::OwnerNodes<$tcx>, <ins> // Note that this deliberately duplicates items in the `rustc_hir::arena`, // since we need to allocate this type on both the `rustc_hir` arena // (during lowering) and the `librustc_middle` arena (for decoding MIR) [decode] asm_template: rustc_ast::ast::InlineAsmTemplatePiece, </ins> ], $tcx); ) }

Discussion:
Discovered when playing with new asm! macro with following code: asm! usage to building will result in error, because this is invalid register name ( this is 100% correct) back to (same code as in 1) build will result with ICE: disable incremental compilation : also fails on x86_64-pc-windows-gnu
cc
It looks like you're missing the modifier here:
That doesn't seem to work since isn't .
It looks like it's nececessary to declare in both and . The error is caused by the wrong trait being used (there are two - one for each crate that calls . Do you want to use your apporach, or should I open a PR with the arena changes?
I'm getting an ICE even after that looks like Is this caused by the same thing or do I submit a bug report?
It's the same issue.
Change:
<ins> error[E0277]: the trait bound `&dyn MyTrait: MyTrait` is not satisfied --> $DIR/issue-102140.rs:23:22 | LL |         MyTrait::foo(&self) |         ------------ -^^^^ |         |            | |         |            the trait `MyTrait` is not implemented for `&dyn MyTrait` |         |            help: consider removing the leading `&`-reference |         required by a bound introduced by this call error[E0277]: the trait bound `&dyn MyTrait: MyTrait` is not satisfied --> $DIR/issue-102140.rs:23:9 | LL |         MyTrait::foo(&self) |         ^^^^^^^^^^^^^^^^^^^ the trait `MyTrait` is not implemented for `&dyn MyTrait` | = help: the trait `MyTrait` is implemented for `Outer` error[E0277]: the trait bound `&dyn MyTrait: MyTrait` is not satisfied --> $DIR/issue-102140.rs:23:9 | LL |         MyTrait::foo(&self) |         ^^^^^^^^^^^^ the trait `MyTrait` is not implemented for `&dyn MyTrait` | = help: the trait `MyTrait` is implemented for `Outer` error: aborting due to 3 previous errors For more information about this error, try `rustc --explain E0277`. </ins>

Discussion:
Based on 's blog posts, I was playing around with RPITIT and dyn Trait. I fully understand that it shouldn't compile :sweat_smile:. It should probably give the same error as you get when is replaced with . Which would be: . Playground: <strongDetails:</strongI started with this code ("shadowing foo" and dot-notation): Which errors with , but recommends the ICE-ing code: . ICE's both on nightly and beta. <details<summary<strongBacktrace 1</strong</summary<p</p</details<details<summary<strongBacktrace 2</strong</summary<p</p</details
the that triggers. Maybe including is enough to fix it?
No, that will just mask the underlying issue.
label +F-returnpositionimpltraitin_trait
Change:
// have `foo.rs` in the repository root it will also match // against anything like `compiler/rustc_foo/src/foo.rs`, // preventing the latter from being formatted. <del> ignore_fmt.add(&format!("!/{untracked_path}")).expect(&untracked_path); </del> <ins> untracked_count += 1; fmt_override.add(&format!("!/{untracked_path}")).expect(&untracked_path); </ins> } // Only check modified files locally to speed up runtime. // We still check all files in CI to avoid bugs in `get_modified_rs_files` letting regressions slip through;

Discussion:
The skipped files are files in the repo that are not tracked by git. It looks like they might still get to the "formatted modified file" counter? I have no other changed files in the repo, so I wonder what rustfmt is saying to have formatted here :sweat_smile:
It detects X files modified, but the fact that they are not tracked means that their rustfmt invocation will be skipped.
It's better to give different counts for skipped and formatted files?
Maybe soemthing like "formatted x files, skipped y untracked files" would make more sense.
The number is actually right, but it's the number of the files that have been modified in the current branch compared to the master branch: you have 86 untracked path in this case. Anywa, we can make it more explicit here.
Change:
assert!(!formats.is_empty(), "dist.compression-formats can't be empty"); cmd.arg("--compression-formats").arg(formats.join(",")); } <del> cmd.args(["--compression-profile", &self.builder.config.dist_compression_profile]); </del> <ins> // For `x install` tarball files aren't needed, so we can speed up the process by not producing them. let compression_profile = if self.builder.kind == Kind::Install { self.builder.verbose("Forcing dist.compression-profile = 'no-op' for `x install`."); // "no-op" indicates that the rust-installer won't produce compressed tarball sources. "no-op" } else { assert!( self.builder.config.dist_compression_profile != "no-op", "dist.compression-profile = 'no-op' can only be used for `x install`" ); &self.builder.config.dist_compression_profile }; cmd.args(&["--compression-profile", compression_profile]); </ins> self.builder.run(&mut cmd); // Ensure there are no symbolic links in the tarball. In particular,

Discussion:
Right now when doing a local , we first compress the artifacts with max compression ratio, just to immediately unpack them again when installing them to disk. Making the compression level less aggressive or skipping it altogether can probably save 5-10 minutes on an x.py install. <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
cc You probably want to use the gzip'd artifacts which are less intensely compressed.
tbh it seems strange that we're compressing these at all - why not put them into an uncompressed .tar archive when using ?
or even better, copy them directly from the build directory to the install directory without going through a .tar archive first.
claim
Skipping the compressions and archiving in favor of directly copying the artifacts seems like a reasonable solution for . But it requires significant changes to how we currently handle . I'm planning to do a comprehensive review on bootstrapping from all angles(including T-bootstrap issues) and make a roadmap for future development. To avoid conflicts(e.g, if we have improvement ideas on dist/install modules, implementing this might increase the technical debt which will require more effort from the team), I will postpone this task for now and re-prioritize it once we have organized the plans.
Change:
<ins> error: generic parameters may not be used in const operations --> $DIR/repeat_expr_hack_gives_right_generics.rs:16:17 | LL |     bar::<{ [1; N] }>(); |                 ^ cannot perform const operation using `N` | = help: const parameters may only be used as standalone arguments, i.e. `N` = help: add `#![feature(generic_const_exprs)]` to allow generic const expressions error: aborting due to 1 previous error </ins>

Discussion:
<!-- [31mICE[0m: Rustc '-Zcrate-attr=feature(effects) -ooutputfile -Zdump-mir-dir=dir' 'thread 'rustc' panicked at 'called on a value'', 'thread 'rustc' panicked at 'called on a value'' File: --auto-reduced (treereduce-rust): &lt;details&lt;summary&lt;strongoriginal code&lt;/strong&lt;/summary&lt;poriginal: </p</detailsVersion information Command: &lt;!-- Include a backtrace in the code block by setting in your environment. E.g. . --&lt;details&lt;summary&lt;strongProgram output&lt;/strong&lt;/summary&lt;p&lt;/p&lt;/details&lt;!-- query stack: [adtdestructor] computing impl for [checkwellformed] checking that is well-formed -- label +F-constmutrefs +F-consttrait_impl +F-effects
Regression in of
doesn't require any features actually, rip
Removed irrelevant errors:
Minimized: or
Change:
# AWS_SECRET_ACCESS_KEY=... - secure: "Pixhh0hXDqGCdOyLtGFjli3J2AtDWIpyb2btIrLe956nCBDRutRoMm6rv5DI9sFZN07Mms7VzNNvhc9wCW1y63JAm414d2Co7Ob8kWMZlz9l9t7ACHuktUiis8yr+S4Quq1Vqd6pqi7pf2J++UxC8R/uLeqVrubzr6+X7AbmEFE=" <ins> # Note that this is overridden on OSX builders install: > travis_retry curl -o $HOME/stamp https://s3.amazonaws.com/rust-lang-ci/rust-ci-mirror/2017-03-17-stamp-x86_64-unknown-linux-musl && chmod +x $HOME/stamp && export PATH=$PATH:$HOME </ins> before_script: - > echo "#### Disk usage before running script:";

Discussion:
Often when debugging travis logs it's difficult to see how long everything is taking as we only time some steps, not all. Additionally there's not a lot of information to see how long it takes between steps. It'd be awesome if we had a tool where we basically wrapped the entire build () in a process that simply prepended all stdout/stderr messages with a relative timestamp. AppVeyor does this by default (has a timestamp for each log line message) but unfortunately Travis doesn't. Apparently which ends up looking like https://travis- which is basically exactly what we'd want.
You probably just want to use from moreutils for this. (This is what Julia does.)
Change:
} impl<'tcx> CastTy<'tcx> { <ins> /// Returns `Some` for integral/pointer casts. /// casts like unsizing casts will return `None` </ins> pub fn from_ty(t: Ty<'tcx>) -> Option<CastTy<'tcx>> { match t.sty { ty::Bool => Some(CastTy::Int(IntTy::Bool)),

Discussion:
<short summary of the bugReturning from a const fn causes internal compiler error, with the message 'bad input type for cast'. I tried this code: Minimal example Original example I expected to see this happen: program compiles and prints 'Hello 1' or I get a compiler error. Instead, this happened: ICE
that gives the exact backtrace above.
Relavent code: The types here are and .
The actual bug would be here then, right?
Not quite sure, but the real bug is that we allow the keyword in const fn XD I already have a fix since yesterday, but the german bahn didn't give me electricity so my notebook died while tests were running
no ICE fix from the ICE? :p
Change:
<ins> // This is a non-regression test for issue #114907 where an ICE happened because of missing // `UniverseInfo`s accessed during diagnostics. // // A couple notes: // - the `FnOnce` bounds need an arg that is a reference // - a custom `Drop` is needed somewhere in the type that `accept` returns, to create universes //   during liveness and dropck outlives computation // check-fail trait Role { type Inner; } struct HandshakeCallback<C>(C); impl<C: FnOnce(&())> Role for HandshakeCallback<C> { type Inner = (); } struct Handshake<R: Role> { _inner: Option<R::Inner>, } impl<R: Role> Drop for Handshake<R> { fn drop(&mut self) {} } fn accept<C: FnOnce(&())>(_: C) -> Handshake<HandshakeCallback<C>> { todo!() } fn main() { let callback = |_| {}; accept(callback); //~^ ERROR mismatched types //~| ERROR mismatched types //~| ERROR implementation of `FnOnce` is not general enough //~| ERROR implementation of `FnOnce` is not general enough //~| ERROR higher-ranked subtype error //~| ERROR higher-ranked subtype error } </ins>

Discussion:
<!-- Thank you for finding an Internal Compiler Error! If possible, try to provide a minimal verifiable example. You can read "Rust Bug Minimization Patterns" for how to create smaller examples. --Does not happen with this callback: <!-- If you're using the stable version of the compiler, you should also check if the bug also exists in the beta or nightly versions. --: </p</details
The code snippet is incomplete: is there a repository available that we could try, to reproduce the error? If not, could you at least add the full function? Thanks!
Rust use tungstenite::handshake::server::{Response, ErrorResponse}; fn acceptconnection(stream: TcpStream, config: rustls::server::ServerConfig) -Result<Socket{ let mut conn = rustls::server::ServerConnection::new(std::sync::Arc::new(()))?; let tlsstream = rustls::StreamOwned::new(conn, stream.tryclone()?); if let Ok(ws) = match tungstenite::accepthdrwithconfig(tlsstream, -std::result::Result<Response, ErrorResponse{ let callback = -std::result::Result<tungstenite::handshake::server::Response, tungstenite::handshake::server::ErrorResponse{ dbg!(&req); dbg!(&res); Ok(res) }; if let Ok(ws) = match tungstenite::accepthdrwithconfig(tlsstream, callback, None) { Err(HandshakeError::Interrupted(midhandshake)) ={ info!( "Handshake interrupted with peer {} - waiting to try again.", peer_addr ); Ok(Socket::Interrupted(midhandshake)) } Err(e) ={ error!("Error accepting secure websocket connection: {e}"); Err(e)? } Ok(ws) =Ok(Socket::SecureWebSocket(ws)), } } }
This is still incomplete and doesn't parse. Do you have a repository where the issue can be reproduced?
No repo. You can make it parse pretty easily. I am not a rustc expert but I believe the issue was with the callback.
Here's a small (but not minimal yet) working repro: and with that we can finally bisect, to : probably that (no need to ping anyone here) I'll minimize next to remove this dependency and create an MCVE.
removed:
Probably not yet an MCVE and could be further simplified, but getting close.

62 error -1.63 error + ice
WG-prioritization assigning priority (). label -I-prioritize +P-medium -E-needs-mcve
Change:
const D: *const [u8; 4] = b"abcd"; <ins> const STR: *const str = "abcd"; </ins> fn main() { match D { D => {} //~ERROR: behave unpredictably //~| previously accepted _ => {} } <ins> match STR { STR => {} //~ERROR: behave unpredictably //~| previously accepted _ => {} } </ins> }

Discussion:
<!-- [31mICE[0m: Rustc '' 'error: internal compiler error: Got a scalar pair where a scalar was expected', 'error: internal compiler error: Got a scalar pair where a scalar was expected' File: --code: Version information Command: <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summary<strongProgram output</strong</summary<p</p</details
Regression in nightly-2023-11-09 ping
Good catch, thanks! should fix this.
Change:
# arm-linux-androideabi configuration <del> LINK_arm-linux-androideabi=$(CFG_ANDROID_CROSS_PATH)/bin/arm-linux-androideabi-gcc </del> CC_arm-linux-androideabi=$(CFG_ANDROID_CROSS_PATH)/bin/arm-linux-androideabi-gcc CXX_arm-linux-androideabi=$(CFG_ANDROID_CROSS_PATH)/bin/arm-linux-androideabi-g++ CPP_arm-linux-androideabi=$(CFG_ANDROID_CROSS_PATH)/bin/arm-linux-androideabi-gcc -E

Discussion:
Appears like: Essentially, 'LINK_foo' is empty. Heres a list:
I think this is your issue. (I ran into it myself while doing a build)
Dup of , apparently.
I believe this will be fixed by
Closing as a duplicate.