ICE in github build #80998

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1. xoviat

   added

   C-bugCategory: This is a bug.Category: This is a bug.

   I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

   T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

   on Jan 14, 2021
2. hellow554 commented on Jan 14, 2021

   

   hellow554

   on Jan 14, 2021

   Contributor

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   Reduced to only use the task proc-macro:

   use embassy::executor::task;
   
   #[task]
   async fn run() {
       let a = Foo ;
   }
   

   It seems important, that Foo isn't defined, if I define a struct Foo, the ICE goes away.
3. hellow554 commented on Jan 14, 2021

   

   hellow554

   on Jan 14, 2021

   Contributor

   More actions

   searched nightlies: from nightly-2020-06-01 to nightly-2021-01-01
   regressed nightly: nightly-2020-10-27
   searched commits: from 4760b8f to fd54259
   regressed commit: b9a94c9

   bisected with cargo-bisect-rustc v0.6.0

   Host triple: x86_64-unknown-linux-gnu
   Reproduce with:

   cargo bisect-rustc 2020-06-01 --regress ice --access github -- check

   ---

   I'm pretty sure that #78324 isn't at fault here, but instead it just uncovers the problem.
4. hellow554 commented on Jan 14, 2021

   

   hellow554

   on Jan 14, 2021

   Contributor

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   MCVE:

   #![feature(type_alias_impl_trait)]
   
   use std::future::Future;
   
   pub struct Task<F: Future>(F);
   impl<F: Future> Task<F> {
       fn new() -> Self {
           todo!()
       }
       fn spawn(&self, _: impl FnOnce() -> F) {
           todo!()
       }
   }
   
   fn main() {
       async fn cb() {
           let a = Foo;
       }
   
       type F = impl Future;
       static POOL: Task<F> = Task::new();
       Task::spawn(&POOL, || cb());
   }
   
5. jonas-schievink

   added

   F-type_alias_impl_trait`#[feature(type_alias_impl_trait)]``#[feature(type_alias_impl_trait)]`

   on Jan 14, 2021
6. jonas-schievink commented on Jan 14, 2021

   

   jonas-schievink

   on Jan 14, 2021

   Contributor

   More actions

   Panic location:

   rust/compiler/rustc_middle/src/ty/mod.rs

   Lines 3071 to 3073 in a4f022e

   	pub fn generator_layout(self, def_id: DefId) -> &'tcx GeneratorLayout<'tcx> {
   	self.optimized_mir(def_id).generator_layout.as_ref().unwrap()
   	}

   👍React with 👍1Reacted by Marcel Hellwig
7. jonas-schievink

   added

   A-async-awaitArea: Async & AwaitArea: Async & Await

   A-coroutinesArea: CoroutinesArea: Coroutines

   on Jan 14, 2021
8. JohnTitor

   added 2 commits that reference this issue on Jan 15, 2021

   Rollup merge of rust-lang#81008 - tmiasko:generator-layout-err, r=tma…

   ...

   This issue will close once commit 11a63fb is merged into the 'main' branch.

   11a63fb

   Rollup merge of rust-lang#81008 - tmiasko:generator-layout-err, r=tma…

   ...

   This issue will close once commit ce06df2 is merged into the 'main' branch.

   ce06df2
9. bors

   closed this as completedin ce06df2on Jan 15, 2021
10. oli-obk

    moved this to Todo in type alias impl trait stabilizationon Sep 9, 2022
11. oli-obk

    added this to type alias impl trait stabilizationon Sep 9, 2022
12. oli-obk

    moved this from Todo to Done in type alias impl trait stabilizationon Sep 9, 2022
13. tmandry

    moved this to Done in wg-async workon Dec 8, 2022
14. tmandry

    added this to wg-async workon Dec 8, 2022