jiebi/CodeConvo huggingface dataset:
Code change:
<!-- 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. --<!-- 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. --: I see similar behavior in stable : The example always succeeds to compile the first time, but uses a large amount of time and memory. : Upon incremental re-compilation, I almost always see one of the following errors. I saw other open issues with a similar error message as the 1.46.0 output below, but in this one the error is affected by the value the array was filled with. : Running sometimes yields a different yet similar error: On 1.46.0: <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summary<strongBacktrace</strong</summary<pOn 1.46.0: </p</details<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
do you know if this is still a problem for you? claim
On 1.66.0, I still get an error upon incremental recompilation with the same code: <details<summary<strongBacktrace</strong</summary</details
Oh wow I didn't know anyone actually hit this so long ago! I turned this into a much nicer panic a few months ago:

Related discussion:
text: interpret_alloc_index.reserve(new_n - n); for idx in n..new_n { let id = encoder.interpret_allocs[idx]; <del> let pos: u32 = encoder.position().try_into().unwrap(); </del> <ins> let pos: u64 = encoder.position().try_into().unwrap(); </ins> interpret_alloc_index.push(pos); interpret::specialized_encode_alloc_id(&mut encoder, tcx, id); }
Code change:
<!-- 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. --<!-- 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. --: I see similar behavior in stable : The example always succeeds to compile the first time, but uses a large amount of time and memory. : Upon incremental re-compilation, I almost always see one of the following errors. I saw other open issues with a similar error message as the 1.46.0 output below, but in this one the error is affected by the value the array was filled with. : Running sometimes yields a different yet similar error: On 1.46.0: <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summary<strongBacktrace</strong</summary<pOn 1.46.0: </p</details<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
do you know if this is still a problem for you? claim
On 1.66.0, I still get an error upon incremental recompilation with the same code: <details<summary<strongBacktrace</strong</summary</details
Oh wow I didn't know anyone actually hit this so long ago! I turned this into a much nicer panic a few months ago:

Related discussion:
text: usize, (), u32, <ins> u64, </ins> bool, std::string::String, crate::metadata::ModChild,
Code change:
I believe the error message for E0308 is incorrect. Here it is, with my emphasis on the part that seems incorrect: Isn't this error because the compiler was able to infer the type, but it was not what was expected? For example, in the example provided in the error explanation, the value assigned to is most definitely , and is expected, so the types don't match. modify labels: A-diagnostics D-incorrect D-confusing C-bug
Also the explanation says: between two types: the type the author explicitly assigned, and the type the compiler inferred. Isn't the most common case passing the wrong type to a function? Usually people do not provide a type annotation to a unless it is necessary to help the compiler figure out what concrete type a generic is. Perhaps the explanation could be clarified and expanded upon for that.
You beat me to it :)
Mentoring instructions: Change to have an up-to-date diagnostic and appropriate long description.
On it.
Proposed text:
Overall text looks good. Can you open a PR and -mention me on it?

Related discussion:
text: Expected type did not match the received type. <del> Erroneous code example: </del> <ins> Erroneous code examples: </ins> ```compile_fail,E0308 <del> let x: i32 = "I am not a number!"; //     ~~~   ~~~~~~~~~~~~~~~~~~~~ //      |             | //      |    initializing expression; //      |    compiler infers type `&str` //      | //    type `i32` assigned to variable `x` </del> <ins> fn plus_one(x: i32) -> i32 { x + 1 } plus_one("Not a number"); //       ^^^^^^^^^^^^^^ expected `i32`, found `&str` if "Not a bool" { // ^^^^^^^^^^^^ expected `bool`, found `&str` } let x: f32 = "Not a float"; //     ---   ^^^^^^^^^^^^^ expected `f32`, found `&str` //     | //     expected due to this </ins> ``` <del> This error occurs when the compiler is unable to infer the concrete type of a variable. It can occur in several cases, the most common being a mismatch between two types: the type the author explicitly assigned, and the type the compiler inferred. </del> <ins> This error occurs when an expression was used in a place where the compiler expected an expression of a different type. It can occur in several cases, the most common being when calling a function and passing an argument which has a different type than the matching type in the function declaration. </ins>
Code change:
<!-- 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. --<!-- 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. . --<details<summary<strongBacktrace</strong</summary<p</p</detailsThis is the most minimal example I could find, it needs tokio with the features "macro" and "sync". While this error occured on Nightly I could also reproduce this on stable (as far back as on 1.39, didn't test beyond that because my build started failing because of other reasons) <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
This is very reminiscent of (await in if guard in match statement)
MCVE: Yeah, very .
Thank you for reducing this further. Totally forgot that I could just declare my own async function this way! But I do understand correctly that the linked example is just related, not the same? (Since it's still occuring in latest nightly and the linked issue seemes to be already fixed)
Yeah, just related - my immediate guess is this is some case that was missed in the fix for that issue. The difference appears to be that is used in a index expression after the await instead of some other way.
Another example: Any usage of in the if guard after the that does not cause to be autorefed (like just from the MCVE would) appears to trigger the ICE.
claim
Assigning as and removing .

Related discussion:
text: // The type table might not have information for this expression // if it is in a malformed scope. (#66387) if let Some(ty) = self.fcx.typeck_results.borrow().expr_ty_opt(expr) { <ins> if guard_borrowing_from_pattern { // Match guards create references to all the bindings in the pattern that are used // in the guard, e.g. `y if is_even(y) => ...` becomes `is_even(*r_y)` where `r_y` // is a reference to `y`, so we must record a reference to the type of the binding. let tcx = self.fcx.tcx; let ref_ty = tcx.mk_ref( // Use `ReErased` as `resolve_interior` is going to replace all the regions anyway. tcx.mk_region(ty::RegionKind::ReErased), ty::TypeAndMut { ty, mutbl: hir::Mutability::Not }, ); self.record(ref_ty, scope, Some(expr), expr.span, guard_borrowing_from_pattern); } </ins> self.record(ty, scope, Some(expr), expr.span, guard_borrowing_from_pattern); } else { self.fcx.tcx.sess.delay_span_bug(expr.span, "no type for node");
Code change:
<!-- 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. --<!-- 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. . --<details<summary<strongBacktrace</strong</summary<p</p</detailsThis is the most minimal example I could find, it needs tokio with the features "macro" and "sync". While this error occured on Nightly I could also reproduce this on stable (as far back as on 1.39, didn't test beyond that because my build started failing because of other reasons) <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
This is very reminiscent of (await in if guard in match statement)
MCVE: Yeah, very .
Thank you for reducing this further. Totally forgot that I could just declare my own async function this way! But I do understand correctly that the linked example is just related, not the same? (Since it's still occuring in latest nightly and the linked issue seemes to be already fixed)
Yeah, just related - my immediate guess is this is some case that was missed in the fix for that issue. The difference appears to be that is used in a index expression after the await instead of some other way.
Another example: Any usage of in the if guard after the that does not cause to be autorefed (like just from the MCVE would) appears to trigger the ICE.
claim
Assigning as and removing .

Related discussion:
text: <del> // check-pass </del> <ins> // build-pass </ins> // edition:2018 // This test is derived from
Code change:
<!-- 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. --<!-- 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. . --<details<summary<strongBacktrace</strong</summary<p</p</detailsThis is the most minimal example I could find, it needs tokio with the features "macro" and "sync". While this error occured on Nightly I could also reproduce this on stable (as far back as on 1.39, didn't test beyond that because my build started failing because of other reasons) <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
This is very reminiscent of (await in if guard in match statement)
MCVE: Yeah, very .
Thank you for reducing this further. Totally forgot that I could just declare my own async function this way! But I do understand correctly that the linked example is just related, not the same? (Since it's still occuring in latest nightly and the linked issue seemes to be already fixed)
Yeah, just related - my immediate guess is this is some case that was missed in the fix for that issue. The difference appears to be that is used in a index expression after the await instead of some other way.
Another example: Any usage of in the if guard after the that does not cause to be autorefed (like just from the MCVE would) appears to trigger the ICE.
claim
Assigning as and removing .

Related discussion:
text: // of the underlying generator. async fn f() -> u8 { 1 } <ins> async fn foo() -> [bool; 10] { [false; 10] } </ins> pub async fn g(x: u8) { match x {
Code change:
<!-- 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. --<!-- 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. . --<details<summary<strongBacktrace</strong</summary<p</p</detailsThis is the most minimal example I could find, it needs tokio with the features "macro" and "sync". While this error occured on Nightly I could also reproduce this on stable (as far back as on 1.39, didn't test beyond that because my build started failing because of other reasons) <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
This is very reminiscent of (await in if guard in match statement)
MCVE: Yeah, very .
Thank you for reducing this further. Totally forgot that I could just declare my own async function this way! But I do understand correctly that the linked example is just related, not the same? (Since it's still occuring in latest nightly and the linked issue seemes to be already fixed)
Yeah, just related - my immediate guess is this is some case that was missed in the fix for that issue. The difference appears to be that is used in a index expression after the await instead of some other way.
Another example: Any usage of in the if guard after the that does not cause to be autorefed (like just from the MCVE would) appears to trigger the ICE.
claim
Assigning as and removing .

Related discussion:
text: } } <ins> // #78366: check the reference to the binding is recorded even if the binding is not autorefed async fn h(x: usize) { match x { y if foo().await[y] => (), _ => (), } } async fn i(x: u8) { match x { y if f().await == y + 1 => (), _ => (), } } </ins> fn main() { let _ = g(10); <ins> let _ = h(9); let _ = i(8); </ins> }
Code change:
For example: There are two issues here: actually helpful? All the code runs in the same thread with the same name, so it doesn't add any more info 's no space between the output and the header, so it's hard to read the logs. cc
I believe the crate, which is using, provides methods for and when constructing its layer, so it should be possible to turn this off. I believe the missing space is probably a bug in that crate, so I'd . It's possible this was the intended formatting, you'd probably need to ask to be sure.
Thanks, I'll do that :)

Related discussion:
text: .with_indent_lines(true) .with_ansi(true) .with_targets(true) <del> .with_thread_ids(true) .with_thread_names(true) </del> .with_wraparound(10) .with_verbose_exit(true) .with_verbose_entry(true) .with_indent_amount(2); <ins> #[cfg(parallel_compiler)] let layer = layer.with_thread_ids(true).with_thread_names(true); </ins> use tracing_subscriber::layer::SubscriberExt; let subscriber = tracing_subscriber::Registry::default().with(filter).with(layer);
Code change:
<!-- Thank you for filing a regression report! A regression is something that changed between versions of Rust but was not supposed to. Please provide a short summary of the regression, along with any information you feel is relevant to replicate it. --I tried this code: I expected to see this happen: no warning. Instead, this happened: ~The attribute is actually applied correctly, otherwise we would get undefined symbol error.~ Also, the extern variable is clearly declared as static, so the warning does not really make sense. Edit: it seems that the code also works without the attribute. So is the attribute actually not needed? Anyway, the warning about is confusing. This problem occurred in our embedded project , where the static global variables are used to provide references to linker symbols. <!-- Provide the most recent version this worked on, for example: It most recently worked on: Rust 1.47 --It most recently worked on: Rust 1.47 stable. Haven't tried newer nightly. : modify labels: +regression-from-stable-to-nightly -regression-untriaged <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
No, this is working correctly. does nothing on extern items, which already do not get mangled, even without the attribute.
OK, sorry for not understanding the behavior of on extern items.
So maybe this should not be marked as regression, this is just a confusing but indeed correct warning message. Is there a way to remove the labels?
claim

Related discussion:
text: Target::Field | Target::Arm | Target::MacroDef => { self.inline_attr_str_error_with_macro_def(hir_id, attr, "no_mangle"); } <ins> // FIXME: #[no_mangle] was previously allowed on non-functions/statics, this should be an error // The error should specify that the item that is wrong is specifically a *foreign* fn/static // otherwise the error seems odd Target::ForeignFn | Target::ForeignStatic => { let foreign_item_kind = match target { Target::ForeignFn => "function", Target::ForeignStatic => "static", _ => unreachable!(), }; self.tcx.struct_span_lint_hir(UNUSED_ATTRIBUTES, hir_id, attr.span, |lint| { lint.build(&format!( "`#[no_mangle]` has no effect on a foreign {}", foreign_item_kind )) .warn( "this was previously accepted by the compiler but is  being phased out; it will become a hard error in  a future release!", ) .span_label(*span, format!("foreign {}", foreign_item_kind)) .note("symbol names in extern blocks are not mangled") .span_suggestion( attr.span, "remove this attribute", String::new(), Applicability::MachineApplicable, ) .emit(); }); } </ins> _ => { // FIXME: #[no_mangle] was previously allowed on non-functions/statics and some // crates used this, so only emit a warning.
Code change:
<!-- Thank you for filing a regression report! A regression is something that changed between versions of Rust but was not supposed to. Please provide a short summary of the regression, along with any information you feel is relevant to replicate it. --I tried this code: I expected to see this happen: no warning. Instead, this happened: ~The attribute is actually applied correctly, otherwise we would get undefined symbol error.~ Also, the extern variable is clearly declared as static, so the warning does not really make sense. Edit: it seems that the code also works without the attribute. So is the attribute actually not needed? Anyway, the warning about is confusing. This problem occurred in our embedded project , where the static global variables are used to provide references to linker symbols. <!-- Provide the most recent version this worked on, for example: It most recently worked on: Rust 1.47 --It most recently worked on: Rust 1.47 stable. Haven't tried newer nightly. : modify labels: +regression-from-stable-to-nightly -regression-untriaged <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
No, this is working correctly. does nothing on extern items, which already do not get mangled, even without the attribute.
OK, sorry for not understanding the behavior of on extern items.
So maybe this should not be marked as regression, this is just a confusing but indeed correct warning message. Is there a way to remove the labels?
claim

Related discussion:
text: <ins> #![warn(unused_attributes)] // Tests that placing the #[no_mangle] attribute on a foreign fn or static emits // a specialized warning. // The previous warning only talks about a "function or static" but foreign fns/statics // are also not allowed to have #[no_mangle] // build-pass extern "C" { #[no_mangle] //~^ WARNING `#[no_mangle]` has no effect on a foreign static //~^^ WARNING this was previously accepted by the compiler pub static FOO: u8; #[no_mangle] //~^ WARNING `#[no_mangle]` has no effect on a foreign function //~^^ WARNING this was previously accepted by the compiler pub fn bar(); } fn no_new_warn() { // Should emit the generic "not a function or static" warning #[no_mangle] //~^ WARNING attribute should be applied to a free function, impl method or static //~^^ WARNING this was previously accepted by the compiler let x = 0_u8; } fn main() {} </ins>
Code change:
<!-- Thank you for filing a regression report! A regression is something that changed between versions of Rust but was not supposed to. Please provide a short summary of the regression, along with any information you feel is relevant to replicate it. --I tried this code: I expected to see this happen: no warning. Instead, this happened: ~The attribute is actually applied correctly, otherwise we would get undefined symbol error.~ Also, the extern variable is clearly declared as static, so the warning does not really make sense. Edit: it seems that the code also works without the attribute. So is the attribute actually not needed? Anyway, the warning about is confusing. This problem occurred in our embedded project , where the static global variables are used to provide references to linker symbols. <!-- Provide the most recent version this worked on, for example: It most recently worked on: Rust 1.47 --It most recently worked on: Rust 1.47 stable. Haven't tried newer nightly. : modify labels: +regression-from-stable-to-nightly -regression-untriaged <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
No, this is working correctly. does nothing on extern items, which already do not get mangled, even without the attribute.
OK, sorry for not understanding the behavior of on extern items.
So maybe this should not be marked as regression, this is just a confusing but indeed correct warning message. Is there a way to remove the labels?
claim

Related discussion:
text: <ins> warning: attribute should be applied to a free function, impl method or static --> $DIR/extern-no-mangle.rs:24:5 | LL |     #[no_mangle] |     ^^^^^^^^^^^^ ... LL |     let x = 0_u8; |     ------------- not a free function, impl method or static | note: the lint level is defined here --> $DIR/extern-no-mangle.rs:1:9 | LL | #![warn(unused_attributes)] |         ^^^^^^^^^^^^^^^^^ = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! warning: `#[no_mangle]` has no effect on a foreign static --> $DIR/extern-no-mangle.rs:11:5 | LL |     #[no_mangle] |     ^^^^^^^^^^^^ help: remove this attribute ... LL |     pub static FOO: u8; |     ------------------- foreign static | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: symbol names in extern blocks are not mangled warning: `#[no_mangle]` has no effect on a foreign function --> $DIR/extern-no-mangle.rs:16:5 | LL |     #[no_mangle] |     ^^^^^^^^^^^^ help: remove this attribute ... LL |     pub fn bar(); |     ------------- foreign function | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! = note: symbol names in extern blocks are not mangled warning: 3 warnings emitted </ins>