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. --The bug exists in the beta, nightly, and stable build channels. : The error and the backtrace provided are produced by the stable build. <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summary<strongBacktrace</strong</summary<p</p</details<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --This issue has been assigned to via . <!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
reduced: Edit: you can actually omit the enum declaration and it still crashes :thinking: `
oh, sorry, I've already got a fix. I'll post it soon. Though it may not be the best one.
Great! You should tweak not losing diags. For further reference, you could do when you work on an issue to avoid conflicts.
okay, thanks. Better late than never… claim
This is caused by , I believe. 1.44 emits errors w/o ICE'ing but 1.45 hits it. godbolt (1.44): godbolt (1.45):
Let's keep this open to track stable/beta backports.
The reference suggested this to be possible, which is how I came to suggest it to OP. We wanted to avoid naming them to not suggest any specific content.
here is another one: (assuming related)
The stable fix is reverted, and the nightly one is also but introduced another fix. I keep this open when that PR is beta-nominated, just in case.
We don't backport the fix in favor of this comment: So I'm just going to close this as fixed.

Related discussion:
text: <ins> enum E { A(u8, u8), } fn main() { let e = E::A(2, 3); match e { E::A(x @ ..) => {  //~ ERROR `x @` is not allowed in a tuple x //~ ERROR cannot find value `x` in this scope } }; } </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. --The bug exists in the beta, nightly, and stable build channels. : The error and the backtrace provided are produced by the stable build. <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summary<strongBacktrace</strong</summary<p</p</details<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --This issue has been assigned to via . <!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
reduced: Edit: you can actually omit the enum declaration and it still crashes :thinking: `
oh, sorry, I've already got a fix. I'll post it soon. Though it may not be the best one.
Great! You should tweak not losing diags. For further reference, you could do when you work on an issue to avoid conflicts.
okay, thanks. Better late than never… claim
This is caused by , I believe. 1.44 emits errors w/o ICE'ing but 1.45 hits it. godbolt (1.44): godbolt (1.45):
Let's keep this open to track stable/beta backports.
The reference suggested this to be possible, which is how I came to suggest it to OP. We wanted to avoid naming them to not suggest any specific content.
here is another one: (assuming related)
The stable fix is reverted, and the nightly one is also but introduced another fix. I keep this open when that PR is beta-nominated, just in case.
We don't backport the fix in favor of this comment: So I'm just going to close this as fixed.

Related discussion:
text: <ins> error[E0425]: cannot find value `x` in this scope --> $DIR/issue-74539.rs:9:13 | LL |             x |             ^ help: a local variable with a similar name exists: `e` error: `x @` is not allowed in a tuple struct --> $DIR/issue-74539.rs:8:14 | LL |         E::A(x @ ..) => { |              ^^^^^^ this is only allowed in slice patterns | = help: remove this and bind each tuple field independently help: if you don't need to use the contents of x, discard the tuple's remaining fields | LL |         E::A(..) => { |              ^^ error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0425`. </ins>
Code change:
I tried to compile this code: I expected the code to compile Instead, it failed to compile with this lifetime error: If I change the function in these ways it compiles. This compiles successfully on Stable Rust 1.45.0 back to 1.26.0 (when lifetimes were stabilized) This fails to compile on these versions(haven't tried previous ones in the same channels): 1.46.0-beta.2 (2020-07-23 ) 1.47.0-nightly (2020-07-28 ) <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --This issue has been assigned to via . <!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOT_END --
Let’s find the culprit for this. ping cleanup
Hey Cleanup Crew ICE-breakers! This bug has been identified as a good "Cleanup ICE-breaking candidate". In case it's useful, here are some [instructions] for tackling these sorts of bugs. Maybe take a look? Thanks! <3 [instructions]: https://rustc-dev- cc
Assigning as and removing .
Regressed in which is a roll-up, likely
cc in case you want to fix this is a follow-up of
The explicit lifetimes are edit: the lt of doesn't matter
assigning to but they will probably need to delegate as there time is limited in near future.
Will look into this today. claim
This code compiles in Rust 1.17 but not in Rust 1.18+: unifies DerefMut/IndexMut to use the "fix-up" path originally used when performing method calls, so it broadens the bug to assignments as well.
Okay, this is an issue near convertplaceoptomutable. Just re-infer the index type and re-do the coercion is sufficient to fix the regionck failure (). However I am not sure why the existing code does not work. This piece of code is last touched in . cc do you have any clue why the existing approach does not work well with regionck?
Hmm.. I would not have expected that code to have to change, since the failure seems to try to make the anonymous lifetime on in the method match , which it should not. I think your patch is sound, but touching the "wrong" thing. Basically now we are creating new lifetimes for the index, when I would have thought that the container type's reference's lifetime needs adjustment. So looking at , I'm guessing is taking the wrong region and should instead invent a new one?
This issue is not related to anonymous lifetime actually, if you spell out the lifetime explicitly it's still the same. The root cause has been identified and that line actually is the culprit, a detailed analysis can be found in .
I a couple of examples of workarounds that allowed the function to compile, with the same signature.

Related discussion:
text: use rustc_span::symbol::{sym, Ident}; use rustc_span::Span; use rustc_trait_selection::autoderef::Autoderef; <ins> use std::slice; </ins> impl<'a, 'tcx> FnCtxt<'a, 'tcx> { /// Type-check `*oprnd_expr` with `oprnd_expr` type-checked already.
Code change:
I tried to compile this code: I expected the code to compile Instead, it failed to compile with this lifetime error: If I change the function in these ways it compiles. This compiles successfully on Stable Rust 1.45.0 back to 1.26.0 (when lifetimes were stabilized) This fails to compile on these versions(haven't tried previous ones in the same channels): 1.46.0-beta.2 (2020-07-23 ) 1.47.0-nightly (2020-07-28 ) <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --This issue has been assigned to via . <!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOT_END --
Let’s find the culprit for this. ping cleanup
Hey Cleanup Crew ICE-breakers! This bug has been identified as a good "Cleanup ICE-breaking candidate". In case it's useful, here are some [instructions] for tackling these sorts of bugs. Maybe take a look? Thanks! <3 [instructions]: https://rustc-dev- cc
Assigning as and removing .
Regressed in which is a roll-up, likely
cc in case you want to fix this is a follow-up of
The explicit lifetimes are edit: the lt of doesn't matter
assigning to but they will probably need to delegate as there time is limited in near future.
Will look into this today. claim
This code compiles in Rust 1.17 but not in Rust 1.18+: unifies DerefMut/IndexMut to use the "fix-up" path originally used when performing method calls, so it broadens the bug to assignments as well.
Okay, this is an issue near convertplaceoptomutable. Just re-infer the index type and re-do the coercion is sufficient to fix the regionck failure (). However I am not sure why the existing code does not work. This piece of code is last touched in . cc do you have any clue why the existing approach does not work well with regionck?
Hmm.. I would not have expected that code to have to change, since the failure seems to try to make the anonymous lifetime on in the method match , which it should not. I think your patch is sound, but touching the "wrong" thing. Basically now we are creating new lifetimes for the index, when I would have thought that the container type's reference's lifetime needs adjustment. So looking at , I'm guessing is taking the wrong region and should instead invent a new one?
This issue is not related to anonymous lifetime actually, if you spell out the lifetime explicitly it's still the same. The root cause has been identified and that line actually is the culprit, a detailed analysis can be found in .
I a couple of examples of workarounds that allowed the function to compile, with the same signature.

Related discussion:
text: op: PlaceOp, expr: &hir::Expr<'_>, base_expr: &hir::Expr<'_>, <del> arg_tys: &[Ty<'tcx>], </del> ) { <del> debug!("convert_place_op_to_mutable({:?}, {:?}, {:?}, {:?})", op, expr, base_expr, arg_tys); </del> <ins> debug!("convert_place_op_to_mutable({:?}, {:?}, {:?})", op, expr, base_expr); </ins> if !self.typeck_results.borrow().is_method_call(expr) { debug!("convert_place_op_to_mutable - builtin, nothing to do"); return;
Code change:
I tried to compile this code: I expected the code to compile Instead, it failed to compile with this lifetime error: If I change the function in these ways it compiles. This compiles successfully on Stable Rust 1.45.0 back to 1.26.0 (when lifetimes were stabilized) This fails to compile on these versions(haven't tried previous ones in the same channels): 1.46.0-beta.2 (2020-07-23 ) 1.47.0-nightly (2020-07-28 ) <!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --This issue has been assigned to via . <!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOT_END --
Let’s find the culprit for this. ping cleanup
Hey Cleanup Crew ICE-breakers! This bug has been identified as a good "Cleanup ICE-breaking candidate". In case it's useful, here are some [instructions] for tackling these sorts of bugs. Maybe take a look? Thanks! <3 [instructions]: https://rustc-dev- cc
Assigning as and removing .
Regressed in which is a roll-up, likely
cc in case you want to fix this is a follow-up of
The explicit lifetimes are edit: the lt of doesn't matter
assigning to but they will probably need to delegate as there time is limited in near future.
Will look into this today. claim
This code compiles in Rust 1.17 but not in Rust 1.18+: unifies DerefMut/IndexMut to use the "fix-up" path originally used when performing method calls, so it broadens the bug to assignments as well.
Okay, this is an issue near convertplaceoptomutable. Just re-infer the index type and re-do the coercion is sufficient to fix the regionck failure (). However I am not sure why the existing code does not work. This piece of code is last touched in . cc do you have any clue why the existing approach does not work well with regionck?
Hmm.. I would not have expected that code to have to change, since the failure seems to try to make the anonymous lifetime on in the method match , which it should not. I think your patch is sound, but touching the "wrong" thing. Basically now we are creating new lifetimes for the index, when I would have thought that the container type's reference's lifetime needs adjustment. So looking at , I'm guessing is taking the wrong region and should instead invent a new one?
This issue is not related to anonymous lifetime actually, if you spell out the lifetime explicitly it's still the same. The root cause has been identified and that line actually is the culprit, a detailed analysis can be found in .
I a couple of examples of workarounds that allowed the function to compile, with the same signature.

Related discussion:
text: <ins> // check-pass // // rust-lang/rust#74933: Lifetime error when indexing with borrowed index use std::ops::{Index, IndexMut}; struct S(V); struct K<'a>(&'a ()); struct V; impl<'a> Index<&'a K<'a>> for S { type Output = V; fn index(&self, _: &'a K<'a>) -> &V { &self.0 } } impl<'a> IndexMut<&'a K<'a>> for S { fn index_mut(&mut self, _: &'a K<'a>) -> &mut V { &mut self.0 } } impl V { fn foo(&mut self) {} } fn test(s: &mut S, k: &K<'_>) { s[k] = V; s[k].foo(); } fn main() { let mut s = S(V); let k = K(&()); test(&mut s, &k); } </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. --It is very finicky to reproduce. is as minimal as I could get without significantly changing the structure of the macro or having other errors cover it up. Apologies for the mess! Updated 2020-08-04: I got it down to a total of only 130 lines of code. Please review the improved output below. Instructions: the project: The ICE was triggered by change in , where I simply changed the scoping on a nested inner generated by a macro from public to private. : On stable, errors regarding scoping are printed (this error is repeated many times): On nightly, a backtrace occurs. <details<summary<strongBacktrace</strong</summary<p</p</details<details<summary<strongcargo expand with pub struct (updated 2020-08-04)</strong</summary<p</p</details
I have reduced this reproducer from about 500 lines of code total to 130 lines total. There are more syntax errors in it now, but the panic still triggers before them. Most of the other things I could change create an error that short circuits the compiler before the panic could trigger. EDIT: I also just updated the backtrace, because I didn't ask for a backtrace last time.
Let's get a MCVE and bisect the culprit PR. ping cleanup
Hey Cleanup Crew ICE-breakers! This bug has been identified as a good "Cleanup ICE-breaking candidate". In case it's useful, here are some [instructions] for tackling these sorts of bugs. Maybe take a look? Thanks! <3 [instructions]: https://rustc-dev- cc
Minimized:
is the likely cause.
Assigning as and removing .

Related discussion:
text: ) = binding.kind { let def_id = (&*self).parent(ctor_def_id).expect("no parent for a constructor"); <del> if let Some(fields) = self.field_names.get(&def_id) { let first_field = fields.first().expect("empty field list in the map"); return Some(fields.iter().fold(first_field.span, |acc, field| acc.to(field.span))); } </del> <ins> let fields = self.field_names.get(&def_id)?; let first_field = fields.first()?; // Handle `struct Foo()` return Some(fields.iter().fold(first_field.span, |acc, field| acc.to(field.span))); </ins> } None }
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. --It is very finicky to reproduce. is as minimal as I could get without significantly changing the structure of the macro or having other errors cover it up. Apologies for the mess! Updated 2020-08-04: I got it down to a total of only 130 lines of code. Please review the improved output below. Instructions: the project: The ICE was triggered by change in , where I simply changed the scoping on a nested inner generated by a macro from public to private. : On stable, errors regarding scoping are printed (this error is repeated many times): On nightly, a backtrace occurs. <details<summary<strongBacktrace</strong</summary<p</p</details<details<summary<strongcargo expand with pub struct (updated 2020-08-04)</strong</summary<p</p</details
I have reduced this reproducer from about 500 lines of code total to 130 lines total. There are more syntax errors in it now, but the panic still triggers before them. Most of the other things I could change create an error that short circuits the compiler before the panic could trigger. EDIT: I also just updated the backtrace, because I didn't ask for a backtrace last time.
Let's get a MCVE and bisect the culprit PR. ping cleanup
Hey Cleanup Crew ICE-breakers! This bug has been identified as a good "Cleanup ICE-breaking candidate". In case it's useful, here are some [instructions] for tackling these sorts of bugs. Maybe take a look? Thanks! <3 [instructions]: https://rustc-dev- cc
Minimized:
is the likely cause.
Assigning as and removing .

Related discussion:
text: <ins> // Regression test for issue #75062 // Tests that we don't ICE on a privacy error for a fieldless tuple struct. mod foo { struct Bar(); } fn main() { foo::Bar(); //~ ERROR tuple struct } </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. --It is very finicky to reproduce. is as minimal as I could get without significantly changing the structure of the macro or having other errors cover it up. Apologies for the mess! Updated 2020-08-04: I got it down to a total of only 130 lines of code. Please review the improved output below. Instructions: the project: The ICE was triggered by change in , where I simply changed the scoping on a nested inner generated by a macro from public to private. : On stable, errors regarding scoping are printed (this error is repeated many times): On nightly, a backtrace occurs. <details<summary<strongBacktrace</strong</summary<p</p</details<details<summary<strongcargo expand with pub struct (updated 2020-08-04)</strong</summary<p</p</details
I have reduced this reproducer from about 500 lines of code total to 130 lines total. There are more syntax errors in it now, but the panic still triggers before them. Most of the other things I could change create an error that short circuits the compiler before the panic could trigger. EDIT: I also just updated the backtrace, because I didn't ask for a backtrace last time.
Let's get a MCVE and bisect the culprit PR. ping cleanup
Hey Cleanup Crew ICE-breakers! This bug has been identified as a good "Cleanup ICE-breaking candidate". In case it's useful, here are some [instructions] for tackling these sorts of bugs. Maybe take a look? Thanks! <3 [instructions]: https://rustc-dev- cc
Minimized:
is the likely cause.
Assigning as and removing .

Related discussion:
text: <ins> error[E0603]: tuple struct `Bar` is private --> $DIR/issue-75062-fieldless-tuple-struct.rs:9:10 | LL |     foo::Bar(); |          ^^^ private tuple struct | note: the tuple struct `Bar` is defined here --> $DIR/issue-75062-fieldless-tuple-struct.rs:5:5 | LL |     struct Bar(); |     ^^^^^^^^^^^^^ error: aborting due to previous error For more information about this error, try `rustc --explain E0603`. </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. --The following code compiles just fine but when trying to run on it I get the error described below <!-- 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</details<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
Making this even more strange, this does not panic with instead.
<details<summaryBacktrace</summary</detailsRustdoc code:
The main function is not necessary, it also crashes on
Yeah this one is beyond me, I have no idea why this is breaking.
This never worked with ; on it says the feature isn't recognized and on it crashes.
Huh, I built that last code snippet in the Rust Playground and it compiled fine:
yes, it only crashes with rustdoc, which isn't available on the playground.
Oops, I missed that part. Sorry about that!
Feel free to ping me on all issues related to const generics claim
Thanks for fixing this!

Related discussion:
text: TyKind::Slice(ref ty) => Slice(box ty.clean(cx)), TyKind::Array(ref ty, ref length) => { let def_id = cx.tcx.hir().local_def_id(length.hir_id); <del> let length = match cx.tcx.const_eval_poly(def_id.to_def_id()) { Ok(length) => { print_const(cx, ty::Const::from_value(cx.tcx, length, cx.tcx.types.usize)) } Err(_) => cx .sess() .source_map() .span_to_snippet(cx.tcx.def_span(def_id)) .unwrap_or_else(|_| "_".to_string()), }; </del> <ins> // NOTE(min_const_generics): We can't use `const_eval_poly` for constants // as we currently do not supply the parent generics to anonymous constants // but do allow `ConstKind::Param`. // // `const_eval_poly` tries to to first substitute generic parameters which // results in an ICE while manually constructing the constant and using `eval` // does nothing for `ConstKind::Param`. let ct = ty::Const::from_anon_const(cx.tcx, def_id); let param_env = cx.tcx.param_env(def_id); let length = print_const(cx, ct.eval(cx.tcx, param_env)); </ins> Array(box ty.clean(cx), length) } TyKind::Tup(ref tys) => Tuple(tys.clean(cx)),
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. --The following code compiles just fine but when trying to run on it I get the error described below <!-- 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</details<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
Making this even more strange, this does not panic with instead.
<details<summaryBacktrace</summary</detailsRustdoc code:
The main function is not necessary, it also crashes on
Yeah this one is beyond me, I have no idea why this is breaking.
This never worked with ; on it says the feature isn't recognized and on it crashes.
Huh, I built that last code snippet in the Rust Playground and it compiled fine:
yes, it only crashes with rustdoc, which isn't available on the playground.
Oops, I missed that part. Sorry about that!
Feel free to ping me on all issues related to const generics claim
Thanks for fixing this!

Related discussion:
text: <ins> // ignore-tidy-linelength #![feature(min_const_generics)] #![crate_name = "foo"] // @has foo/type.CellIndex.html '//pre[@class="rust typedef"]' 'type CellIndex<const D: usize> = [i64; D];' pub type CellIndex<const D: usize> = [i64; D]; </ins>