ICE: broken MIR

[DougAnderson444]

I was just scaffolding a new project in a cargo workspace, when I got this error (note that cargo check ran just fine)

Code

use str0m::change::SdpStrategy;
use str0m::{Candidate, RtcError};

pub fn say_hello() {
    println!("Hello, world!");
}

pub fn create_sdp_offer() {}

Meta

rustc --version --verbose:

rustc 1.67.0 (fc594f156 2023-01-24)
binary: rustc
commit-hash: fc594f15669680fa70d255faec3ca3fb507c3405
commit-date: 2023-01-24
host: x86_64-pc-windows-msvc
release: 1.67.0
LLVM version: 15.0.6

Error output

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

error: internal compiler error: broken MIR in Item(WithOptConstParam { did: DefId(0:3469 ~ combine[c418]::stream::{impl#47}::reset), const_param_did: None }) (after phase change to runtime-optimized) at bb0[2]:
                                encountered `Assign((_0, const Result::<(), StringStreamError>::Ok(())))` with incompatible types:
                                left-hand side has type: Result<(), <&str as StreamOnce>::Error>
                                right-hand side has type: Result<(), StringStreamError>
   --> C:\Users\douga\.cargo\registry\src\github.com-1ecc6299db9ec823\combine-4.6.6\src\stream\mod.rs:44:17
    |
44  |                 Ok(())
    |                 ^^^^^^
...
153 | clone_resetable! {('a) &'a str}
    | ------------------------------- in this macro invocation
    |
    = note: delayed at   

Backtrace

   Compiling combine v4.6.6
   Compiling str0m v0.1.0 (https://github.com/algesten/str0m.git#c52ec951)
error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: broken MIR in Item(WithOptConstParam { did: DefId(0:3469 ~ combine[c418]::stream::{impl#47}::reset), const_param_did: None }) (after phase change to runtime-optimized) at bb0[2]:
                                encountered `Assign((_0, const Result::<(), StringStreamError>::Ok(())))` with incompatible types:
                                left-hand side has type: Result<(), <&str as StreamOnce>::Error>
                                right-hand side has type: Result<(), StringStreamError>
   --> C:\Users\douga\.cargo\registry\src\github.com-1ecc6299db9ec823\combine-4.6.6\src\stream\mod.rs:44:17
    |
44  |                 Ok(())
    |                 ^^^^^^
...
153 | clone_resetable! {('a) &'a str}
    | ------------------------------- in this macro invocation
    |
    = note: delayed at    0: std::backtrace::Backtrace::disabled
               1: std::backtrace::Backtrace::force_capture
               2: <rustc_errors::HandlerInner>::emit_diagnostic
               3: rustc_const_eval::const_eval::fn_queries::is_parent_const_impl_raw
               4: <rustc_const_eval::transform::promote_consts::Candidate as core::fmt::Debug>::fmt
               5: <rustc_const_eval::transform::validate::Validator as rustc_middle::mir::MirPass>::run_pass
               6: <rustc_mir_transform::ctfe_limit::CtfeLimit as rustc_middle::mir::MirPass>::run_pass
               7: <rustc_mir_transform::generator::StateTransform as rustc_middle::mir::MirPass>::run_pass
               8: <rustc_middle::ty::Visibility as rustc_privacy::VisibilityLike>::new_min
               9: <rustc_metadata::creader::CStore>::from_tcx
              10: rustc_metadata::rmeta::encoder::encode_metadata
              11: <rustc_metadata::rmeta::LazyTables as rustc_serialize::serialize::Decodable<rustc_metadata::rmeta::decoder::DecodeContext>>::decode
              12: rustc_metadata::rmeta::encoder::encode_metadata
              13: rustc_metadata::fs::encode_and_write_metadata
              14: rustc_interface::passes::start_codegen
              15: rustc_interface::passes::output_filenames
              16: <rustc_interface::queries::Queries>::ongoing_codegen
              17: rustc_driver_impl::args::arg_expand_all
              18: rustc_driver_impl::args::arg_expand_all
              19: <rustc_data_structures::temp_dir::MaybeTempDir>::new
              20: <rustc_data_structures::temp_dir::MaybeTempDir>::new
              21: std::sys::windows::thread::Thread::new
              22: BaseThreadInitThunk
              23: RtlUserThreadStart

    = note: this error: internal compiler error originates in the macro `clone_resetable` (in Nightly builds, run with -Z macro-backtrace for more info)

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 1.69.0-nightly (bd39bbb4b 2023-02-07) running on x86_64-pc-windows-msvc

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

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

query stack during panic:
end of query stack
error: could not compile `combine`

[jyn514]

                                left-hand side has type: Result<(), <&str as StreamOnce>::Error>
                                right-hand side has type: Result<(), StringStreamError>

looks like something in the compiler is failing to normalize the error type? nightly-2023-02-07 is somewhat old, @DougAnderson444 can you try again with latest nightly?

[lukas-code]

This looks like #107678

[DougAnderson444]

can you try again with latest nightly?

Yes of course, upgrading made this error disappear, thank you!