rustc panic

[rickardnorlander]

Code

pub struct MyStruct<'a> {
    field: &'a [u32],
}

impl MyStruct<'_> {
    pub fn new<'a>(field: &'a[u32]) -> MyStruct<'a> {
	Self{field}
    }
}

fn main() {
}

Meta

rustc 1.63.0-nightly (b31f9cc22 2022-06-15)
binary: rustc
commit-hash: b31f9cc22bcd720b37ddf927afe378108a5b9a54
commit-date: 2022-06-15
host: x86_64-unknown-linux-gnu
release: 1.63.0-nightly
LLVM version: 14.0.5

Error output

Compiling crash_repro v0.1.0 (/home/rickard/repro)
thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_borrowck/src/diagnostics/region_errors.rs:683:52
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 1.63.0-nightly (b31f9cc22 2022-06-15) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type bin -C embed-bitcode=no -C debuginfo=2 -C incremental

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [mir_borrowck] borrow-checking `<impl at src/main.rs:5:1: 9:2>::new`
#1 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `crash_repro`

Backtrace

stack backtrace:
   0: rust_begin_unwind
             at /rustc/b31f9cc22bcd720b37ddf927afe378108a5b9a54/library/std/src/panicking.rs:584:5
   1: core::panicking::panic_fmt
             at /rustc/b31f9cc22bcd720b37ddf927afe378108a5b9a54/library/core/src/panicking.rs:142:14
   2: core::panicking::panic
             at /rustc/b31f9cc22bcd720b37ddf927afe378108a5b9a54/library/core/src/panicking.rs:48:5
   3: <rustc_borrowck::MirBorrowckCtxt>::report_general_error
   4: rustc_borrowck::do_mir_borrowck
   5: rustc_borrowck::mir_borrowck
   6: <rustc_borrowck::provide::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
   7: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId, &rustc_middle::mir::query::BorrowCheckResult>
   8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalDefId, &rustc_middle::mir::query::BorrowCheckResult>>
   9: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_borrowck
  10: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_interface::passes::analysis::{closure#2}::{closure#0}>
  11: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#2}>
  12: rustc_interface::passes::analysis
  13: <rustc_query_system::dep_graph::graph::DepGraph<rustc_middle::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle::ty::context::TyCtxt, (), core::result::Result<(), rustc_errors::ErrorGuaranteed>>
  14: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::plumbing::QueryCtxt, rustc_query_system::query::caches::DefaultCache<(), core::result::Result<(), rustc_errors::ErrorGuaranteed>>>
  15: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  16: <rustc_interface::passes::QueryContext>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
  17: <rustc_interface::interface::Compiler>::enter::<rustc_driver::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
  18: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::create_compiler_and_run<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#1}>
  19: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>

[rickardnorlander]

Changing Self{field} to MyStruct{field} makes it build btw.

[jhpratt]

I haven't done a search for the exact commit, but on the playground this regressed between beta and nightly.

@rustbot label +regression-from-stable-to-nightly

[compiler-errors]

This is due to the NLL stabilization PR #95565, since it manifests with #![feature(nll)] on 1.61 (with env BOOTSTRAP_RUSTC=1 to allow feature flags). I'll be looking at it in a few hours when I get home!