ICE in rustc_borrowck/src/region_infer

[sjeohp]

Code

use tungstenite::handshake::server::{Response, ErrorResponse};
fn accept_connection(stream: TcpStream, config: rustls::server::ServerConfig) -> Result<Socket> {
    let mut conn = rustls::server::ServerConnection::new(std::sync::Arc::new(config.clone()))?;
    let tlsstream = rustls::StreamOwned::new(conn, stream.try_clone()?);
    if let Ok(ws) = match tungstenite::accept_hdr_with_config(tlsstream, |req, res| -> std::result::Result<Response, ErrorResponse> {
        let callback = |req, res| -> std::result::Result<tungstenite::handshake::server::Response, tungstenite::handshake::server::ErrorResponse> {
            dbg!(&req);
            dbg!(&res);
            Ok(res)
        }; 
        if let Ok(ws) = match tungstenite::accept_hdr_with_config(tlsstream, callback, None) {

Does not happen with this callback:

    let callback = |req: &Request, res| {
        dbg!(req);
         dbg!(&res);
         Ok(res)
    };  

Meta

rustc --version --verbose:

rustc 1.71.1 (eb26296b5 2023-08-03)
binary: rustc
commit-hash: eb26296b556cef10fb713a38f3d16b9886080f26
commit-date: 2023-08-03
host: aarch64-apple-darwin
release: 1.71.1
LLVM version: 16.0.5

Error output

thread 'rustc' panicked at 'IndexMap: key not found', compiler/rustc_borrowck/src/region_infer/mod.rs:2243:9
stack backtrace:
   0:        0x1050b2cc0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hb75be2413dd8ceb3
   1:        0x105101a64 - core::fmt::write::h95d50546e769656f
   2:        0x1050a8e2c - std::io::Write::write_fmt::hce019ca594763835
   3:        0x1050b2b14 - std::sys_common::backtrace::print::hae7307dcada41b2a
   4:        0x1050b5578 - std::panicking::default_hook::{{closure}}::h30c41986d637ef23
   5:        0x1050b5380 - std::panicking::default_hook::h81d03189ef2e7e78
   6:        0x10d567f98 - rustc_driver_impl[21827c9a287a9f15]::install_ice_hook::{closure#0}
   7:        0x1050b5c2c - std::panicking::rust_panic_with_hook::he8360f4d28da55fc
   8:        0x1050b5a0c - std::panicking::begin_panic_handler::{{closure}}::he9e07d605072520f
   9:        0x1050b30a0 - std::sys_common::backtrace::__rust_end_short_backtrace::he03bf52f9c1eb73a
  10:        0x1050b5780 - _rust_begin_unwind
  11:        0x10512c9e0 - core::panicking::panic_fmt::ha5f5ca2311fff2ad
  12:        0x10512c9ac - core::option::expect_failed::hd3d75bda03d1d99e
  13:        0x11032336c - <rustc_borrowck[d3fa50dc65dee768]::MirBorrowckCtxt>::report_region_errors
  14:        0x1103347b4 - rustc_borrowck[d3fa50dc65dee768]::do_mir_borrowck
  15:        0x110327a84 - rustc_borrowck[d3fa50dc65dee768]::mir_borrowck
  16:        0x11083d904 - rustc_query_impl[465c999071b35b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[465c999071b35b]::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a39402582bfd677]::query::erase::Erased<[u8; 8usize]>>
  17:        0x11072372c - <rustc_query_impl[465c999071b35b]::query_impl::mir_borrowck::dynamic_query::{closure#2} as core[6a5f4426c52daa32]::ops::function::FnOnce<(rustc_middle[a39402582bfd677]::ty::context::TyCtxt, rustc_span[2eda851f0959417e]::def_id::LocalDefId)>>::call_once
  18:        0x1106f6a9c - rustc_query_system[1b28c1e83e3a453c]::query::plumbing::try_execute_query::<rustc_query_impl[465c999071b35b]::DynamicConfig<rustc_query_system[1b28c1e83e3a453c]::query::caches::VecCache<rustc_span[2eda851f0959417e]::def_id::LocalDefId, rustc_middle[a39402582bfd677]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[465c999071b35b]::plumbing::QueryCtxt, true>
  19:        0x1108d4a44 - rustc_query_impl[465c999071b35b]::query_impl::mir_borrowck::get_query_incr::__rust_end_short_backtrace
  20:        0x10d5b48e8 - <core[6a5f4426c52daa32]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[f6cc48a9066b13bc]::sync::par_for_each_in<&[rustc_span[2eda851f0959417e]::def_id::LocalDefId], <rustc_middle[a39402582bfd677]::hir::map::Map>::par_body_owners<rustc_interface[df80c09a2aa6fb7f]::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}> as core[6a5f4426c52daa32]::ops::function::FnOnce<()>>::call_once
  21:        0x10d5c1ed8 - rustc_data_structures[f6cc48a9066b13bc]::sync::par_for_each_in::<&[rustc_span[2eda851f0959417e]::def_id::LocalDefId], <rustc_middle[a39402582bfd677]::hir::map::Map>::par_body_owners<rustc_interface[df80c09a2aa6fb7f]::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>
  22:        0x10d62bdc8 - rustc_interface[df80c09a2aa6fb7f]::passes::analysis
  23:        0x110841f30 - rustc_query_impl[465c999071b35b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[465c999071b35b]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[a39402582bfd677]::query::erase::Erased<[u8; 1usize]>>
  24:        0x1107af73c - <rustc_query_impl[465c999071b35b]::query_impl::analysis::dynamic_query::{closure#2} as core[6a5f4426c52daa32]::ops::function::FnOnce<(rustc_middle[a39402582bfd677]::ty::context::TyCtxt, ())>>::call_once
  25:        0x1106a09c0 - rustc_query_system[1b28c1e83e3a453c]::query::plumbing::try_execute_query::<rustc_query_impl[465c999071b35b]::DynamicConfig<rustc_query_system[1b28c1e83e3a453c]::query::caches::SingleCache<rustc_middle[a39402582bfd677]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[465c999071b35b]::plumbing::QueryCtxt, true>
  26:        0x11072bfb0 - rustc_query_impl[465c999071b35b]::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
  27:        0x10d527200 - <rustc_interface[df80c09a2aa6fb7f]::queries::QueryResult<&rustc_middle[a39402582bfd677]::ty::context::GlobalCtxt>>::enter::<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}::{closure#2}::{closure#4}>
  28:        0x10d569568 - <rustc_interface[df80c09a2aa6fb7f]::interface::Compiler>::enter::<rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}::{closure#2}, core[6a5f4426c52daa32]::result::Result<core[6a5f4426c52daa32]::option::Option<rustc_interface[df80c09a2aa6fb7f]::queries::Linker>, rustc_span[2eda851f0959417e]::ErrorGuaranteed>>
  29:        0x10d5220b4 - rustc_span[2eda851f0959417e]::set_source_map::<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  30:        0x10d51882c - <scoped_tls[80ce123946cbe7a6]::ScopedKey<rustc_span[2eda851f0959417e]::SessionGlobals>>::set::<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>
  31:        0x10d525268 - std[12e62f360352ccd]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[df80c09a2aa6fb7f]::util::run_in_thread_pool_with_globals<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>
  32:        0x10d51641c - <<std[12e62f360352ccd]::thread::Builder>::spawn_unchecked_<rustc_interface[df80c09a2aa6fb7f]::util::run_in_thread_pool_with_globals<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#1} as core[6a5f4426c52daa32]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  33:        0x1050be640 - std::sys::unix::thread::Thread::new::thread_start::h06dea01d0985d944
  34:        0x1a7b33fa8 - __pthread_joiner_wake

query stack during panic:
#0 [mir_borrowck] borrow-checking `accept_connection`
#1 [analysis] running analysis passes on this crate
end of query stack

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: BoundUniversalRegionError { longer_fr: '?279, error_element: Location(bb0[0]), placeholder: Placeholder { universe: U14, bound: BoundRegion { var: 0, kind: BrNamed(DefId(36:1566 ~ tungstenite[c104]::handshake::server::{impl#2}::'_), '_) } } }
  |
  = note: delayed at compiler/rustc_borrowck/src/region_infer/mod.rs:1743:27
             0: std::backtrace::Backtrace::create
             1: <rustc_errors::HandlerInner>::emit_diagnostic
             2: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
             3: <rustc_borrowck::diagnostics::region_errors::RegionErrors>::push::<rustc_borrowck::diagnostics::region_errors::RegionErrorKind>
             4: <rustc_borrowck::region_infer::RegionInferenceContext>::check_bound_universal_region
             5: <rustc_borrowck::region_infer::RegionInferenceContext>::solve
             6: rustc_borrowck::nll::compute_regions
             7: rustc_borrowck::do_mir_borrowck
             8: rustc_borrowck::mir_borrowck
             9: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
            10: <rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
            11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
            12: rustc_query_impl::query_impl::mir_borrowck::get_query_incr::__rust_end_short_backtrace
            13: <core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::par_for_each_in<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}> as core::ops::function::FnOnce<()>>::call_once
            14: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>
            15: rustc_interface::passes::analysis
            16: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
            17: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
            18: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
            19: rustc_query_impl::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
            20: <rustc_interface::queries::QueryResult<&rustc_middle::ty::context::GlobalCtxt>>::enter::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}>
            21: <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_span::ErrorGuaranteed>>
            22: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
            23: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            24: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            25: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            26: std::sys::unix::thread::Thread::new::thread_start
            27: __pthread_joiner_wake

error: internal compiler error: `compute_regions` tainted `infcx` with errors but did not emit any errors
   --> midgard/src/lib.rs:325:1
    |
325 | / fn accept_connection(stream: TcpStream, config: rustls::server::ServerConfig) -> Result<Socket> {
326 | |     let mut conn = rustls::server::ServerConnection::new(std::sync::Arc::new(config.clone()))?;
327 | |     let tlsstream = rustls::StreamOwned::new(conn, stream.try_clone()?);
328 | |     let f = |req, res| -> std::result::Result<tungstenite::handshake::server::Response, tungstenite::handshake::server::ErrorResponse> {
...   |
354 | |     }
355 | | }
    | |_^
    |
    = note: delayed at compiler/rustc_borrowck/src/nll.rs:310:52
               0: std::backtrace::Backtrace::create
               1: <rustc_errors::HandlerInner>::emit_diagnostic
               2: <rustc_session::session::Session>::delay_span_bug::<rustc_span::span_encoding::Span, &str>
               3: rustc_borrowck::nll::compute_regions
               4: rustc_borrowck::do_mir_borrowck
               5: rustc_borrowck::mir_borrowck
               6: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
               7: <rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
               8: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
               9: rustc_query_impl::query_impl::mir_borrowck::get_query_incr::__rust_end_short_backtrace
              10: <core::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures::sync::par_for_each_in<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}> as core::ops::function::FnOnce<()>>::call_once
              11: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>
              12: rustc_interface::passes::analysis
              13: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
              14: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
              15: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, true>
              16: rustc_query_impl::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
              17: <rustc_interface::queries::QueryResult<&rustc_middle::ty::context::GlobalCtxt>>::enter::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}>
              18: <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_span::ErrorGuaranteed>>
              19: rustc_span::set_source_map::<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
              20: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
              21: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
              22: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
              23: std::sys::unix::thread::Thread::new::thread_start
              24: __pthread_joiner_wake
            

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: failed while formatting fluent string `infer_trait_placeholder_mismatch`: 
the fluent string has an argument `trait_def_id` that was not found.
help: no arguments are available
', compiler/rustc_errors/src/emitter.rs:2397:77
stack backtrace:
   0:        0x101732cc0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hb75be2413dd8ceb3
   1:        0x101781a64 - core::fmt::write::h95d50546e769656f
   2:        0x101728e2c - std::io::Write::write_fmt::hce019ca594763835
   3:        0x101732b14 - std::sys_common::backtrace::print::hae7307dcada41b2a
   4:        0x101735578 - std::panicking::default_hook::{{closure}}::h30c41986d637ef23
   5:        0x101735380 - std::panicking::default_hook::h81d03189ef2e7e78
   6:        0x109be7f98 - rustc_driver_impl[21827c9a287a9f15]::install_ice_hook::{closure#0}
   7:        0x101735c2c - std::panicking::rust_panic_with_hook::he8360f4d28da55fc
   8:        0x101735a0c - std::panicking::begin_panic_handler::{{closure}}::he9e07d605072520f
   9:        0x1017330a0 - std::sys_common::backtrace::__rust_end_short_backtrace::he03bf52f9c1eb73a
  10:        0x101735780 - _rust_begin_unwind
  11:        0x1017ac9e0 - core::panicking::panic_fmt::ha5f5ca2311fff2ad
  12:        0x1017acda0 - core::result::unwrap_failed::h34067e5e60f3683e
  13:        0x10db8574c - <rustc_errors[8219b94d386394ca]::emitter::FileWithAnnotatedLines>::collect_annotations
  14:        0x10db8809c - <rustc_errors[8219b94d386394ca]::emitter::EmitterWriter>::emit_message_default::{closure#0}
  15:        0x10db8b494 - <rustc_errors[8219b94d386394ca]::emitter::EmitterWriter>::emit_messages_default
  16:        0x10db81c68 - <rustc_errors[8219b94d386394ca]::emitter::EmitterWriter as rustc_errors[8219b94d386394ca]::emitter::Emitter>::emit_diagnostic
  17:        0x10dbaba30 - <rustc_errors[8219b94d386394ca]::json::Diagnostic>::from_errors_diagnostic
  18:        0x10dbaa638 - <rustc_errors[8219b94d386394ca]::json::JsonEmitter as rustc_errors[8219b94d386394ca]::emitter::Emitter>::emit_diagnostic
  19:        0x10db962f0 - <rustc_errors[8219b94d386394ca]::HandlerInner>::emit_diagnostic::{closure#2}
  20:        0x10db95c48 - <rustc_errors[8219b94d386394ca]::HandlerInner>::emit_diagnostic
  21:        0x10db96998 - <rustc_errors[8219b94d386394ca]::HandlerInner>::flush_delayed::<alloc[e0f95eb21a34f6a8]::vec::Vec<rustc_errors[8219b94d386394ca]::DelayedDiagnostic>, &str>
  22:        0x10db931a0 - <rustc_errors[8219b94d386394ca]::HandlerInner as core[6a5f4426c52daa32]::ops::drop::Drop>::drop
  23:        0x109b8cc28 - core[6a5f4426c52daa32]::ptr::drop_in_place::<rustc_session[1039b6c2e3771dcd]::parse::ParseSess>
  24:        0x109b8e0d0 - core[6a5f4426c52daa32]::ptr::drop_in_place::<rustc_session[1039b6c2e3771dcd]::session::Session>
  25:        0x109ba4e88 - core[6a5f4426c52daa32]::ptr::drop_in_place::<rustc_interface[df80c09a2aa6fb7f]::interface::Compiler>
  26:        0x109ba24f0 - rustc_span[2eda851f0959417e]::set_source_map::<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  27:        0x109b9882c - <scoped_tls[80ce123946cbe7a6]::ScopedKey<rustc_span[2eda851f0959417e]::SessionGlobals>>::set::<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>
  28:        0x109ba5268 - std[12e62f360352ccd]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[df80c09a2aa6fb7f]::util::run_in_thread_pool_with_globals<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>
  29:        0x109b9641c - <<std[12e62f360352ccd]::thread::Builder>::spawn_unchecked_<rustc_interface[df80c09a2aa6fb7f]::util::run_in_thread_pool_with_globals<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#1} as core[6a5f4426c52daa32]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  30:        0x10173e640 - std::sys::unix::thread::Thread::new::thread_start::h06dea01d0985d944
  31:        0x1a7b33fa8 - __pthread_joiner_wake

query stack during panic:
end of query stack
thread 'rustc' panicked at 'panic in a function that cannot unwind', library/core/src/panicking.rs:126:5
stack backtrace:
   0:        0x101732cc0 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hb75be2413dd8ceb3
   1:        0x101781a64 - core::fmt::write::h95d50546e769656f
   2:        0x101728e2c - std::io::Write::write_fmt::hce019ca594763835
   3:        0x101732b14 - std::sys_common::backtrace::print::hae7307dcada41b2a
   4:        0x101735578 - std::panicking::default_hook::{{closure}}::h30c41986d637ef23
   5:        0x101735380 - std::panicking::default_hook::h81d03189ef2e7e78
   6:        0x109be7f98 - rustc_driver_impl[21827c9a287a9f15]::install_ice_hook::{closure#0}
   7:        0x101735c2c - std::panicking::rust_panic_with_hook::he8360f4d28da55fc
   8:        0x1017359d0 - std::panicking::begin_panic_handler::{{closure}}::he9e07d605072520f
   9:        0x1017330a0 - std::sys_common::backtrace::__rust_end_short_backtrace::he03bf52f9c1eb73a
  10:        0x101735780 - _rust_begin_unwind
  11:        0x1017aca10 - core::panicking::panic_nounwind_fmt::h6a635b966d82551e
  12:        0x1017aca8c - core::panicking::panic_nounwind::h241eff56ec55ba7a
  13:        0x1017acb80 - core::panicking::panic_cannot_unwind::h911ff5cd61f62d63
  14:        0x109ba2508 - rustc_span[2eda851f0959417e]::set_source_map::<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  15:        0x109b9882c - <scoped_tls[80ce123946cbe7a6]::ScopedKey<rustc_span[2eda851f0959417e]::SessionGlobals>>::set::<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>
  16:        0x109ba5268 - std[12e62f360352ccd]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[df80c09a2aa6fb7f]::util::run_in_thread_pool_with_globals<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>
  17:        0x109b9641c - <<std[12e62f360352ccd]::thread::Builder>::spawn_unchecked_<rustc_interface[df80c09a2aa6fb7f]::util::run_in_thread_pool_with_globals<rustc_interface[df80c09a2aa6fb7f]::interface::run_compiler<core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>, rustc_driver_impl[21827c9a287a9f15]::run_compiler::{closure#1}>::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[6a5f4426c52daa32]::result::Result<(), rustc_span[2eda851f0959417e]::ErrorGuaranteed>>::{closure#1} as core[6a5f4426c52daa32]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  18:        0x10173e640 - std::sys::unix::thread::Thread::new::thread_start::h06dea01d0985d944
  19:        0x1a7b33fa8 - __pthread_joiner_wake

note: rustc 1.71.1 (eb26296b5 2023-08-03) running on aarch64-apple-darwin

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

[lqd]

@sjeohp The code snippet is incomplete: is there a repository available that we could try, to reproduce the error? If not, could you at least add the full accept_connection function?
Thanks!

[sjeohp]

use tungstenite::handshake::server::{Response, ErrorResponse};
fn accept_connection(stream: TcpStream, config: rustls::server::ServerConfig) -> Result<Socket> {
    let mut conn = rustls::server::ServerConnection::new(std::sync::Arc::new(config.clone()))?;
    let tlsstream = rustls::StreamOwned::new(conn, stream.try_clone()?);
    if let Ok(ws) = match tungstenite::accept_hdr_with_config(tlsstream, |req, res| -> std::result::Result<Response, ErrorResponse> {
        let callback = |req, res| -> std::result::Result<tungstenite::handshake::server::Response, tungstenite::handshake::server::ErrorResponse> {
            dbg!(&req);
            dbg!(&res);
            Ok(res)
        }; 
        if let Ok(ws) = match tungstenite::accept_hdr_with_config(tlsstream, callback, None) {
        Err(HandshakeError::Interrupted(midhandshake)) => {
            info!(
                "Handshake interrupted with peer {} - waiting to try again.",
                peer_addr
            );  
            Ok(Socket::Interrupted(midhandshake))
        }   

        Err(e) => {
            error!("Error accepting secure websocket connection: {e}");
            Err(e)?
        }   

        Ok(ws) => Ok(Socket::SecureWebSocket(ws)),
    }   
}
}

[lqd]

@sjeohp This is still incomplete and doesn't parse.

Do you have a repository where the issue can be reproduced?

[sjeohp]

No repo. You can make it parse pretty easily. I am not a rustc expert but I believe the issue was with the callback.

[lqd]

Here's a small (but not minimal yet) working repro:

use std::io::{self, Read, Write};

struct S;

impl Read for S {
    fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> {
        todo!()
    }
}

impl Write for S {
    fn write(&mut self, _buf: &[u8]) -> io::Result<usize> {
        todo!()
    }

    fn flush(&mut self) -> io::Result<()> {
        todo!()
    }
}

fn main() {
    let s = S;
    tungstenite::accept_hdr(s, |_, _| {
        let callback = |_, _| {
            todo!()
        };

        tungstenite::accept_hdr(s, callback);
        todo!()
    });
}

---

and with that we can finally bisect, to nightly-2022-06-08:

• Update Clippy #97730
• Rollup of 3 pull requests #97809
• update Miri #97801
• Remove migrate borrowck mode #95565 probably that (no need to ping anyone here)
• Add support for emitting functions with coldcc to LLVM #97512
• Rollup of 5 pull requests #97825
• Rollup of 5 pull requests #97835

I'll minimize tungstenite next to remove this dependency and create an MCVE.