called Result::unwrap() on an Err value: NoSolution in trace.rs

[richardstephens]

Code

A minimal project is published here:
https://github.com/richardstephens/rust-bug-report

I will try to minimise this further

Meta

rustc --version --verbose:

rustc 1.69.0-nightly (585f3eef2 2023-02-11)
binary: rustc
commit-hash: 585f3eef26f04440bca726c29193af7b4fa90e54
commit-date: 2023-02-11
host: x86_64-unknown-linux-gnu
release: 1.69.0-nightly
LLVM version: 15.0.7

Error output

error: 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 1.69.0-nightly (585f3eef2 2023-02-11) running on x86_64-unknown-linux-gnu

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

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

query stack during panic:
#0 [mir_borrowck] borrow-checking `status_service::start_web_server::{closure#0}::{closure#0}`
#1 [mir_borrowck] borrow-checking `status_service::start_web_server::{closure#0}`
#2 [mir_borrowck] borrow-checking `status_service::start_web_server`
#3 [type_of] computing type of `status_service::start_web_server::{opaque#0}`
#4 [check_mod_item_types] checking item types in module `status_service`
#5 [analysis] running analysis passes on this crate
end of query stack
Some errors have detailed explanations: E0282, E0412, E0425, E0432, E0433.
For more information about an error, try `rustc --explain E0282`.

Backtrace

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: NoSolution', compiler/rustc_borrowck/src/type_check/liveness/trace.rs:574:88
stack backtrace:
   0: rust_begin_unwind
             at /rustc/585f3eef26f04440bca726c29193af7b4fa90e54/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/585f3eef26f04440bca726c29193af7b4fa90e54/library/core/src/panicking.rs:64:14
   2: core::result::unwrap_failed
             at /rustc/585f3eef26f04440bca726c29193af7b4fa90e54/library/core/src/result.rs:1790:5
   3: <rustc_borrowck::type_check::liveness::trace::LivenessContext>::add_drop_live_facts_for
   4: rustc_borrowck::type_check::liveness::trace::trace
   5: rustc_borrowck::type_check::liveness::generate
   6: rustc_borrowck::type_check::type_check
   7: rustc_borrowck::nll::compute_regions
   8: rustc_borrowck::do_mir_borrowck
   9: rustc_borrowck::mir_borrowck
  10: <rustc_borrowck::provide::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
  11: <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>
  12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::mir_borrowck, rustc_query_impl::plumbing::QueryCtxt>
  13: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_borrowck
  14: <rustc_borrowck::type_check::TypeChecker>::prove_closure_bounds
  15: <rustc_borrowck::type_check::TypeChecker>::typeck_mir
  16: rustc_borrowck::type_check::type_check
  17: rustc_borrowck::nll::compute_regions
  18: rustc_borrowck::do_mir_borrowck
  19: rustc_borrowck::mir_borrowck
  20: <rustc_borrowck::provide::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
  21: <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>
  22: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::mir_borrowck, rustc_query_impl::plumbing::QueryCtxt>
  23: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_borrowck
  24: <rustc_borrowck::type_check::TypeChecker>::prove_closure_bounds
  25: <rustc_borrowck::type_check::TypeChecker>::typeck_mir
  26: rustc_borrowck::type_check::type_check
  27: rustc_borrowck::nll::compute_regions
  28: rustc_borrowck::do_mir_borrowck
  29: rustc_borrowck::mir_borrowck
  30: <rustc_borrowck::provide::{closure#0} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
  31: <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>
  32: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::mir_borrowck, rustc_query_impl::plumbing::QueryCtxt>
  33: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::mir_borrowck
  34: rustc_hir_analysis::collect::type_of::type_of
  35: <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::DefId, rustc_middle::ty::Ty>
  36: rustc_query_system::query::plumbing::get_query::<rustc_query_impl::queries::type_of, rustc_query_impl::plumbing::QueryCtxt, rustc_middle::dep_graph::dep_node::DepKind>
  37: rustc_hir_analysis::check::check::check_mod_item_types
  38: <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, ()>
  39: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::check_mod_item_types, rustc_query_impl::plumbing::QueryCtxt>
  40: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::check_mod_item_types
  41: <rustc_session::session::Session>::time::<(), rustc_hir_analysis::check_crate::{closure#6}>
  42: rustc_hir_analysis::check_crate
  43: rustc_interface::passes::analysis
  44: <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>>
  45: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::queries::analysis, rustc_query_impl::plumbing::QueryCtxt>
  46: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::analysis
  47: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#3}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
  48: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_errors::ErrorGuaranteed>>
  49: rustc_span::with_source_map::<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  50: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_errors::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_errors::ErrorGuaranteed>>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[jieyouxu]

Slightly smaller: https://github.com/jieyouxu/issue-107960-minimizer/blob/minimize/src/main.rs

#![feature(allocator_api)]

use std::net::SocketAddr;

use hyper::server::conn::http1;
use hyper::service::service_fn;
use hyper::Response;
use hyper::body::Bytes;
use tokio::net::TcpListener;

async fn handle_req() -> Result<Response<BoxBody<Bytes, hyper::Error>>, Box<dyn std::error::Error + Send + Sync>> {
    todo!()
}

pub async fn start_web_server() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
    let listener = TcpListener::bind(addr).await?;
    loop {
        let (stream, _) = listener.accept().await?;
        tokio::task::spawn(async move {
            http1::Builder::new()
                .serve_connection(stream, service_fn(|_| handle_req()))
                .await;
        });
    }
}

fn main() {}

[matthiaskrgr]

Probably similar to #103899

[Luk-ESC]

Neither https://github.com/richardstephens/rust-bug-report nor the minimized code ICEs for me on the latest nightly

[richardstephens]

I did some quick testing and it no longer ICE's on 1.71 stable either, so I'm happy to consider this closed.