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Internal Compiler Error: 'called Option::unwrap() on a None value', compiler/rustc_middle/src/hir/map/collector.rs:227:50 #84149

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dwrensha opened this issue Apr 13, 2021 · 1 comment · Fixed by #84168
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Internal Compiler Error: 'called Option::unwrap() on a None value', compiler/rustc_middle/src/hir/map/collector.rs:227:50 #84149

dwrensha opened this issue Apr 13, 2021 · 1 comment · Fixed by #84168
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@cjgillot
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C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@dwrensha
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dwrensha commented Apr 13, 2021 •
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rustc crashes on the following input, found by fuzz-rustc:

trait C{async fn b(){fn a()}}
$ rustc bug.rs
error[E0670]: `async fn` is not permitted in Rust 2015
 --> bug.rs:1:9
  |
1 | trait C{async fn b(){fn a()}}
  |         ^^^^^ to use `async fn`, switch to Rust 2018 or later
  |
  = help: set `edition = "2018"` in `Cargo.toml`
  = note: for more on editions, read https://doc.rust-lang.org/edition-guide

error: expected one of `->`, `;`, `where`, or `{`, found `}`
 --> bug.rs:1:28
  |
1 | trait C{async fn b(){fn a()}}
  |                         -  ^ expected one of `->`, `;`, `where`, or `{`
  |                         |
  |                         while parsing this `fn`

error[E0706]: functions in traits cannot be declared `async`
 --> bug.rs:1:9
  |
1 | trait C{async fn b(){fn a()}}
  |         -----^^^^^^^^^^^^^^^
  |         |
  |         `async` because of this
  |
  = note: `async` trait functions are not currently supported
  = note: consider using the `async-trait` crate: https://crates.io/crates/async-trait

error: free function without a body
 --> bug.rs:1:22
  |
1 | trait C{async fn b(){fn a()}}
  |                      ^^^^^-
  |                           |
  |                           help: provide a definition for the function: `{ <body> }`

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/hir/map/collector.rs:227:50
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.53.0-nightly (a86612456 2021-04-11) running on x86_64-unknown-linux-gnu

query stack during panic:
thread 'rustc' panicked at 'already borrowed: BorrowMutError', /rustc/a8661245649f3d1c0dc5b23270bdac0bbd2d8f64/compiler/rustc_data_structures/src/sync.rs:481:16
stack backtrace:
   0:     0x7ff7b6025e90 - std::backtrace_rs::backtrace::libunwind::trace::h6a5a16c17f2319af
                               at /rustc/a8661245649f3d1c0dc5b23270bdac0bbd2d8f64/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7ff7b6025e90 - std::backtrace_rs::backtrace::trace_unsynchronized::hcafc938d846f3b80
                               at /rustc/a8661245649f3d1c0dc5b23270bdac0bbd2d8f64/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7ff7b6025e90 - std::sys_common::backtrace::_print_fmt::h7b5e8e740a969b2e
                               at /rustc/a8661245649f3d1c0dc5b23270bdac0bbd2d8f64/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7ff7b6025e90 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h111ecac9cf62ba00
                               at /rustc/a8661245649f3d1c0dc5b23270bdac0bbd2d8f64/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7ff7b609711f - core::fmt::write::h7aa6cd0067dca82a
                               at /rustc/a8661245649f3d1c0dc5b23270bdac0bbd2d8f64/library/core/src/fmt/mod.rs:1094:17
   5:     0x7ff7b601a805 - std::io::Write::write_fmt::h3f775e769673afe3
                               at /rustc/a8661245649f3d1c0dc5b23270bdac0bbd2d8f64/library/std/src/io/mod.rs:1580:15
...

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.53.0-nightly (a86612456 2021-04-11) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
thread panicked while panicking. aborting.
Illegal instruction (core dumped)

The error happens on nightly and beta, but not on stable.
@dwrensha dwrensha added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Apr 13, 2021
@dwrensha
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Looks like this regressed in #82891.

@cjgillot

searched nightlies: from nightly-2021-01-05 to nightly-2021-04-10
regressed nightly: nightly-2021-03-14
searched commits: from b3e19a2 to acca818
regressed commit: 32dce35

bisected with cargo-bisect-rustc v0.6.0

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

cargo bisect-rustc --start=2021-01-05 --end=2021-04-10 --regress ice

@cjgillot cjgillot self-assigned this Apr 13, 2021
@cjgillot cjgillot mentioned this issue Apr 13, 2021
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fanninpm added a commit to fanninpm/glacier that referenced this issue Apr 16, 2021
@fanninpm
Add 84149
b75a805 
Issue: rust-lang/rust#84149
fanninpm added a commit to fanninpm/glacier that referenced this issue Apr 16, 2021
@fanninpm
Add 84149
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Issue: rust-lang/rust#84149
@rust-lang-glacier-bot rust-lang-glacier-bot added the glacier ICE tracked in rust-lang/glacier. label Apr 19, 2021
@bors bors closed this as completed in e5b5745 Apr 19, 2021
@github-actions github-actions bot mentioned this issue Apr 20, 2021
Merged
@jyn514 jyn514 mentioned this issue May 26, 2021
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C-bug Category: This is a bug. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Lower async fn in traits. cjgillot/rust
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@dwrensha @cjgillot @rust-lang-glacier-bot