jiebi/CodeConvo huggingface dataset:
Code change:
<ins> error: prefix `world` is unknown --> $DIR/lex-bad-str-literal-as-char-3.rs:5:21 | LL |     println!('hello world'); |                     ^^^^^ unknown prefix | = note: prefixed identifiers and literals are reserved since Rust 2021 help: if you meant to write a string literal, use double quotes | LL |     println!("hello world"); |              ~           ~ </ins> error[E0762]: unterminated character literal --> $DIR/lex-bad-str-literal-as-char-3.rs:5:26 |

Related discussion:
text: <!-- [31mICE[0m: Rustc '--edition=2021 --crate-type=lib -ooutputfile -Zdump-mir-dir=dir' 'error: internal compiler error: prefix is unknown', 'error: internal compiler error: prefix is unknown' File: --snippet: 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<!-- query stack: --
:thinking: this bisects to cc
very plausible :+1:
Reduced
Code change:
<ins> error[E0631]: type mismatch in closure arguments --> $DIR/issue-41366.rs:10:5 | LL |     (&|_|()) as &dyn for<'x> Fn(<u32 as T<'x>>::V); |     ^^-----^ |     | | |     | found signature of `fn(_) -> _` |     expected signature of `for<'x> fn(<u32 as T<'x>>::V) -> _` | = note: required for the cast to the object type `dyn for<'x> std::ops::Fn(<u32 as T<'x>>::V)` error[E0271]: type mismatch resolving `for<'x> <[closure@$DIR/issue-41366.rs:10:7: 10:12] as std::ops::FnOnce<(<u32 as T<'x>>::V,)>>::Output == ()` --> $DIR/issue-41366.rs:10:5 | LL |     (&|_|()) as &dyn for<'x> Fn(<u32 as T<'x>>::V); |     ^^^^^^^^ expected bound lifetime parameter 'x, found concrete lifetime | = note: required for the cast to the object type `dyn for<'x> std::ops::Fn(<u32 as T<'x>>::V)` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0271`. </ins>

Related discussion:
text: Binder(<[type error] as ToBytes) This only happens if there are two erroneous functions, if I take out it works fine. It seems like I was trying to do this wrong in the first place since the first function gives an error . Not sure what the right way to do this is. <details<summaryTraceback</summary</details
Tried to reduce it and found a similar case with the same ICE:
Compiler triage: Seems likely to be caused by the need for lazy norm. Marking as p-medium for now.
The ICE doesn't appear on the latest nightly, marked as E-needstest
Code change:
<ins> // Copyright 2016 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. // @has issue_31899/index.html // @has - 'Make this line a bit longer.' // @!has - 'rust rust-example-rendered' // @!has - 'use ndarray::arr2' // @!has - 'prohibited' /// A tuple or fixed size array that can be used to index an array. /// Make this line a bit longer. /// /// ``` /// use ndarray::arr2; /// /// let mut a = arr2(&[[0, 1], [0, 0]]); /// a[[1, 1]] = 1; /// assert_eq!(a[[0, 1]], 1); /// assert_eq!(a[[1, 1]], 1); /// ``` /// /// **Note** the blanket implementation that's not visible in rustdoc: /// `impl<D> NdIndex for D where D: Dimension { ... }` pub fn bar() {} /// Some line /// /// # prohibited pub fn foo() {} /// Some line /// /// 1. prohibited /// 2. bar pub fn baz() {} /// Some line /// /// - prohibited /// - bar pub fn qux() {} /// Some line /// /// * prohibited /// * bar pub fn quz() {} /// Some line /// /// > prohibited /// > bar pub fn qur() {} /// Some line /// /// prohibited /// ===== /// /// Second /// ------ pub fn qut() {} </ins>

Related discussion:
text: A documentation comment like the one cited verbatim below, produces a main page summary that includes the first line of the code in the example. This is very surprising since there's an empty line in between, and the code example inserts a large colored box in the overview page (the parent module). cc since it's probably related to PR /// A tuple or fixed size array that can be used to index an array. /// /// /// /// Note the blanket implementation that's not visible in rustdoc: /// !
Code change:
<ins> error[E0277]: the trait bound `T: Clone` is not satisfied --> $DIR/global-cache-and-parallel-frontend.rs:15:17 | LL | #[derive(Clone, Eq)] |                 ^^ the trait `Clone` is not implemented for `T`, which is required by `Struct<T>: PartialEq` | note: required for `Struct<T>` to implement `PartialEq` --> $DIR/global-cache-and-parallel-frontend.rs:18:19 | LL | impl<T: Clone, U> PartialEq<U> for Struct<T> |         -----     ^^^^^^^^^^^^     ^^^^^^^^^ |         | |         unsatisfied trait bound introduced here note: required by a bound in `Eq` --> $SRC_DIR/core/src/cmp.rs:LL:COL = note: this error originates in the derive macro `Eq` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider restricting type parameter `T` | LL | pub struct Struct<T: std::clone::Clone>(T); |                    +++++++++++++++++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`. </ins>

Related discussion:
text: <!-- 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. --After adding to , I get the ICE. The resulting : The full project: <!-- 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. --: <!-- Include a backtrace in the code block by setting in your environment. E.g. . --
Looks like another label: +T-types +WG-trait-system-refactor +regression-from-stable-to-nightly
Stable passes, beta passes. Nightly passes with either or Discovered with It does sporadically succeed, thus needing to clean and rerun the build to make sure. Either something is up with or it only barely exercises these conditions in the parallel frontend, even after cleaning and running the build 100 times. Meanwhile, fails something like ~50% of the time on my machine.
stable passes obviously, as -Zthreads this is a unstable nightly-only flag?
Hm, not actually obvious given that works, though I suppose that does mean it isn't a regression per se. :^)
oh I thought you knew by now that this is the forbidden env flag that should only ever be used for bootstrapping and nothing else and we should not even tell users about it. If you set the flag, your "stable" will also eat nightly-only features, but why would that make a "to-stable" regression if you explicitly tell the compiler "please act like you are NOT a stable release"? I don't think it make sense to backport fixes for untable nightly features into stable lol
who mentioned backports?
The label is used to gather regressions between release channels, which are then discussed whether they are backport-worthy or not. Is that not how the label is used?
I don't really think regression-from-stable-to-nightly nor regression-from-stable-to-stable are used for that at all? Probably regression-from-stable-to-beta is?
Code change:
<ins> error[E0277]: the trait bound `T: Clone` is not satisfied --> $DIR/global-cache-and-parallel-frontend.rs:15:17 | LL | #[derive(Clone, Eq)] |                 ^^ the trait `Clone` is not implemented for `T`, which is required by `Struct<T>: PartialEq` | note: required for `Struct<T>` to implement `PartialEq` --> $DIR/global-cache-and-parallel-frontend.rs:18:19 | LL | impl<T: Clone, U> PartialEq<U> for Struct<T> |         -----     ^^^^^^^^^^^^     ^^^^^^^^^ |         | |         unsatisfied trait bound introduced here note: required by a bound in `Eq` --> $SRC_DIR/core/src/cmp.rs:LL:COL = note: this error originates in the derive macro `Eq` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider restricting type parameter `T` | LL | pub struct Struct<T: std::clone::Clone>(T); |                    +++++++++++++++++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`. </ins>

Related discussion:
text: Pretty much what the title says, I've narrowed it down to and today's nightly with the following: I've attached some backtraces.
probably duplicate of but made more prevalent by next solver
Is it possible to provide a link to or a snippet of a reproducer? I know it probably happens to various crates, but it still would be nice to have something that reproduces.
See for an attached repro.
The repro case is basically the same as , but with other crates mentioned in the ICE logs from the issue comment.
Code change:
<ins> error[E0277]: the trait bound `T: Clone` is not satisfied --> $DIR/global-cache-and-parallel-frontend.rs:15:17 | LL | #[derive(Clone, Eq)] |                 ^^ the trait `Clone` is not implemented for `T`, which is required by `Struct<T>: PartialEq` | note: required for `Struct<T>` to implement `PartialEq` --> $DIR/global-cache-and-parallel-frontend.rs:18:19 | LL | impl<T: Clone, U> PartialEq<U> for Struct<T> |         -----     ^^^^^^^^^^^^     ^^^^^^^^^ |         | |         unsatisfied trait bound introduced here note: required by a bound in `Eq` --> $SRC_DIR/core/src/cmp.rs:LL:COL = note: this error originates in the derive macro `Eq` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider restricting type parameter `T` | LL | pub struct Struct<T: std::clone::Clone>(T); |                    +++++++++++++++++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`. </ins>

Related discussion:
text: Compile with latest Nightly got ICE like below: when compiling in code OS: x86_64-apple-darwin
cc
Wyvern, could you provide some sort of reproducer? A link to some commit in some repository or better yet a smaller stripped down version of it?
Can you provide an example which triggers this behavior?
I'm not sure which commit/PR of lead to this crash, sometimes it compiled successfully, sometimes it not. Add this info to original post, hope to help investigation.
are you running with greater than 1? The cache is broken when used with more than 1 thread (which we should fix)
Sorry, I wasn't clear. I meant a link to your project (the project you are trying to compile) if publicly accessible / not proprietary.
I can hit plenty of these while fuzzing with -Zthreads so yeah its probably that.
Yeah, I think was the culprit. Comment out this option crashes disappears.
the easiest fix to rustc is to just disable this assert when we're using more than 1 thread. I've only it for debugging purposes to detect cases where we unnecessarily recompute cache entries
just hit this while trying to bootstrap with Zthreads :sweat_smile:
cc as this also showed up in your ci test run ^^
When I just disable this assert, all relevant UI tests passed with no other bugs or ICE
samle code that triggers this in around 5 of 6 cases with -Zthreads=16
Code change:
("thread_local", Whitelisted, Gated(Stability::Unstable, "thread_local", "`#[thread_local]` is an experimental feature, and does  <del> not currently handle destructors. There is no  corresponding `#[task_local]` mapping to the task  model", </del> <ins> not currently handle destructors.", </ins> cfg_fn!(thread_local))), ("rustc_on_unimplemented", Normal, Gated(Stability::Unstable,

Related discussion:
text: I will like to fix this. What should be the better warning message here? Or I just need to remove the last sentence?
It seems fine to just remove the sentence.
Fixed by
Code change:
<ins> trait Foo {} impl<T> Foo for T {} fn main() { let array = [(); { loop {} }]; //~ ERROR constant evaluation is taking a long time let tup = (7,); let x: &dyn Foo = &tup.0; } </ins>

Related discussion:
text: <!-- [31mICE[0m: Rustc '' 'error: internal compiler error: named field access on non-ADT', 'error: internal compiler error: named field access on non-ADT' File: --auto-reduced (treereduce-rust): original: 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<!-- query stack: 22 | let buf: &mut [*const dyn Foo] = &mut [&u8, &u8.0, &u32, &u32.0]; [livesymbolsandignoredderivedtraits] finding live symbols in crate [checkmod_deathness] checking deathness of variables in top-level module [analysis] running analysis passes on this crate --
mmh this bisects to cc
Code change:
// want to keep their span info to improve diagnostics in these cases in a later stage. (true, Some(AssocOp::Multiply)) | // `{ 42 } *foo = bar;` or `{ 42 } * 3` (true, Some(AssocOp::Subtract)) | // `{ 42 } -5` <del> (true, Some(AssocOp::Add)) => { // `{ 42 } + 42 </del> <ins> (true, Some(AssocOp::LAnd)) | // `{ 42 } &&x` (#61475) (true, Some(AssocOp::Add)) // `{ 42 } + 42 // If the next token is a keyword, then the tokens above *are* unambiguously incorrect: // `if x { a } else { b } && if y { c } else { d }` if !self.look_ahead(1, |t| t.is_reserved_ident()) => { </ins> // These cases are ambiguous and can't be identified in the parser alone let sp = self.sess.source_map().start_point(self.span); self.sess.ambiguous_block_expr_parse.borrow_mut().insert(sp, lhs.span);

Related discussion:
text: root: yup-oauth2 - 360 detected crates which regressed due to this; cc <details</details
I think this might have been caused by
I can confirm that is the cause. Patch coming shortly.
Code change:
<ins> mod b { #[derive(Default)] pub struct A(u32); } impl b::A { fn inherent_bypass(&self) { let Self(x) = self; //~^ ERROR: tuple struct constructor `A` is private println!("{x}"); } } pub trait B { fn f(&self); } impl B for b::A { fn f(&self) { let Self(a) = self; //~^ ERROR: tuple struct constructor `A` is private println!("{}", a); } } pub trait Projector { type P; } impl Projector for () { type P = b::A; } pub trait Bypass2 { fn f2(&self); } impl Bypass2 for <() as Projector>::P { fn f2(&self) { let Self(a) = self; //~^ ERROR: tuple struct constructor `A` is private println!("{}", a); } } fn main() {} </ins>

Related discussion:
text: I tried this code: I expected to see this happen: compilation should fail because the trait impl is defined outside of the module for the type but refers to its private field. Instead, this happened: this compiled successfully This reproduces on the playground for stable Rust, version 1.69.0:
Adding a main function and attempting to call the (playground link: ) raises the compilation error: !
This can be reproduced with cross-crate (e.i., any other crate can access the private field). This means that all encapsulations that take advantage of the field being private can be bypassed. (For example, if we change Vec to a tuple struct, the same thing as setlen could be done in safe code by abusing this bug.) label +I-unsound Also, this can be reproduced in all versions where is stable (e.i., 1.32+). It's a matter of how you initialize Foo. If you provide a constructor for Foo, you won't get a compile error:
Just for completeness, turning this into a segfault without external crates/just std:
label A-visibility
this has been unsound ever since in version 1.32
WG-prioritization assigning priority (). label -I-prioritize +P-high
Code change:
| -------------- variant or associated item `PIE` not found here ... LL |     ApplePie = Delicious::Apple as isize | Delicious::PIE as isize, <del> |                                                       ^^^ variant or associated item not found in `Delicious` </del> <ins> |                                                       ^^^ |                                                       | |                                                       variant or associated item not found in `Delicious` |                                                       help: there is a variant with a similar name: `Pie` </ins> error: aborting due to previous error

Related discussion:
text: Given the following code: The current output is: <!-- The following is not always necessary. --Ideally the output should include a note suggesting the variant with the same name (but different case):
label +C-enhancement +D-newcomer-roadblock
This only doesn't Just Work because the Levenshtein thing is case sensitive, right? There is some special-casing for case-insensitive suggestions but afaict it only applies if the case-sensitive Levenshtein distance is also already low, which seems wrong at first glance.
im working on this Edit: I'm not working on this anymore because I ran out of time getting past incremental compilation / llvm errors after a rebase.
Okay, judging by , this is explicitly not supposed to work. shrug emoji Edit: Okay, maybe that test case didn't really care. The use of case-insensitive match as tie breaker for equal levenshtein distance only was introduced with afaict.
Code change:
<ins> // check-pass // compile-flags: --emit=mir,link // Regression test for #66930, this ICE requires `--emit=mir` flag. static UTF8_CHAR_WIDTH: [u8; 0] = []; pub fn utf8_char_width(b: u8) -> usize { UTF8_CHAR_WIDTH[b as usize] as usize } fn main() {} </ins>

Related discussion:
text: This is while debug printing all mir statements of libcore.
modify labels: +A-mir +C-bug +requires-nightly
This also reproduces on .
The incorrectly assumes at several places that the allocation kind is always what the type should contain. It for example assumes that an value always points to a function, and always points to raw bytes. It also ignores relocations at several places.
Triage: I think this ICE is fixed by , no longer occurs with the latest nightly. Marking as E-needs-test.
Code change:
<ins> // check-pass // compile-flags: --emit=mir,link // Regression test for #66930, this ICE requires `--emit=mir` flag. static UTF8_CHAR_WIDTH: [u8; 0] = []; pub fn utf8_char_width(b: u8) -> usize { UTF8_CHAR_WIDTH[b as usize] as usize } fn main() {} </ins>

Related discussion:
text: Minimal reproducer: Make sure to run rustc with to reproduce! Using doesn't fix this.
Minimal repro:
Other failure with code causing the above problem: This one is observable by printing the whole mir using , unlike the other, which requires you to debug print every statement.
cc
That second one is a miri assertion: Interestingly, there's an afterwards that would be more helpful if it were before: cc
It seems like no longer ICE with latest nightly, I guess fixed this (CC: Marked as E-needstest
points out hasn't been fixed yet, dropping E-needstest.
Is the issue description still accurate? "Can't debug format a mir stmt in DefId" reminds me of a after we had some ICE issues with debug-printing DefIds. But as far as I can see, no example mentioned here even triggers an ICE with that message. The ICEs described here sound very different than that, they look like CTFE is not handling ZSTs properly somewhere.
I cannot on beta or nightly, so it looks pretty fixed to me. can you still reproduce this issue with latest nightly? The first backtrace has no code, so it is impossible to debug; the second backtrace (the one with self-contained code) does not seem to ICE any more.
Uhm? I don't think so, did you run with ?
Ah, I just ran on playground. It would be good to have up-to-date reproduction instructions in the first post, and not just in the third post below a huge stacktrace.
Yeah, but I don't have write access :/
Ouch, sorry. :( I didn't know. I will update the OP.
<details<summaryHere's a backtrace with debug info</summary</details Looks like the is wrong.
Triage: I think that ICE is fixed by , no longer occurs with the latest nightly. Marking as E-needs-test.
Code change:
[[package]] name = "racer" <del> version = "2.1.46" </del> <ins> version = "2.1.47" </ins> source = "registry+https://github.com/rust-lang/crates.io-index" <del> checksum = "e7cbda48a9124ed2e83766d2c15e3725710d344abca35fad8cf52341a55883b1" </del> <ins> checksum = "513c70e67444a0d62fdc581dffa521c6820942a5f08300d0864863f8d0e750e3" </ins> dependencies = [ "bitflags", "clap",

Related discussion:
text: Hello, this is your friendly neighborhood mergebot. After merging PR rust-lang/rust, I observed that the tool rls no longer builds. A follow-up PR to the repository is needed to fix the fallout. cc do you think you would have time to do the follow-up work? If so, that would be great!
Sure, I can look at this one.
Thanks for merging ! If I'm reading things right, I think I need a new crater release of it so I can update ? If so, can you please make one of those?
Code change:
} } <ins> #[derive(Debug)] pub struct OffsetOverflowError; </ins> /// A single source in the `SourceMap`. #[derive(Clone)] pub struct SourceFile {

Related discussion:
text: I know that having huge literal in source is a bad idea, but it should not cause ICE :( It looks like something overflowed. Version: Command, output and backtrace: Here is the generator of the source:
cc
Took a quick look. We certainly have a restriction that any file can't be that large, because we use u32 for indexing. And looks like we never try to enforce it anywhere. I think the place to do that would be . Do we have any way to panic without this being marked as ICE? I don't want to thread to each , and this seems like a marginal error where it's totally OK to panic. This is even OK in the IDE context I think: IDE should enforce reasonable max size of the file (something like 10mb, not 4gb) at the virtual file system layer. The "just panic" fix is here:
Do we have any way to panic without this being marked as ICE? or if the context is available.
I tried to compile the same thing in gcc and clang: With gcc: With clang: EDIT: Opened
Code change:
let buildpath = fs::connect(_path, "/build"); need_dir(buildpath); #debug("Installing: %s -> %s", cf, buildpath); <del> let p = run::program_output("rustc", ["--out-dir", buildpath, cf]); </del> <ins> let p = run::program_output(rustc_sysroot(), ["--out-dir", buildpath, cf]); </ins> if p.status != 0 { error(#fmt["rustc failed: %dn%sn%s", p.status, p.err, p.out]); ret;

Related discussion:
text: cargo is relying on the to find rustc, but if one runs cargo with , cargo will error out with the unhelpful: cargo should detect this and return a proper error message for this. A proper workaround for this is to make sure that has an absolute path to the binaries set, as in: It needs to be absolute because cargo does a chdir to the build directory, which would break a relative path.
We have a function, that cargo can use to determine the path to itself, then use to launch the corresponding rustc.
Code change:
let buildpath = fs::connect(_path, "/build"); need_dir(buildpath); #debug("Installing: %s -> %s", cf, buildpath); <del> let p = run::program_output("rustc", ["--out-dir", buildpath, cf]); </del> <ins> let p = run::program_output(rustc_sysroot(), ["--out-dir", buildpath, cf]); </ins> if p.status != 0 { error(#fmt["rustc failed: %dn%sn%s", p.status, p.err, p.out]); ret;

Related discussion:
text: Instead of just saying the key can't be verified, explain why.
Yeah, it should also not fail! Missing gpg is a warning condition, not an error condition.