Nightly compiler error "thread 'rustc' panicked at 'no errors encountered even though delay_span_bug issued'"

[OccationalDev]

Code

Some code that uses crate rocket@0.5.0-rc.1

Meta

rustc --version --verbose:

rustc 1.60.0-nightly (0c292c966 2022-02-08)
binary: rustc
commit-hash: 0c292c9667f1b202a9150d58bdd2e89e3e803996
commit-date: 2022-02-08
host: x86_64-unknown-linux-gnu
release: 1.60.0-nightly
LLVM version: 13.0.0

Error output

error: internal compiler error: encountered ambiguity selecting `Binder(<response::stream::reader::ReaderStream<impl futures::Stream<Item = response::stream::raw_sse::RawLinedEvent>> as std::convert::From<impl futures::Stream<Item = response::stream::raw_sse::RawLinedEvent>>>, [])` during codegen, presuming due to overflow or prior type error
  |
  = note: delayed at compiler/rustc_trait_selection/src/traits/codegen.rs:54:32

thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', compiler/rustc_errors/src/lib.rs:1176:13
stack backtrace:
   0:     0x7f6e1fa9b9fc - std::backtrace_rs::backtrace::libunwind::trace::hef696c91488c46df
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f6e1fa9b9fc - std::backtrace_rs::backtrace::trace_unsynchronized::h76c93ef0698d26b2
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f6e1fa9b9fc - std::sys_common::backtrace::_print_fmt::h93575aa503bf6e1b
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f6e1fa9b9fc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h40967adecfbc037b
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f6e1fafd0dc - core::fmt::write::h03044e853df7d223
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/core/src/fmt/mod.rs:1190:17
   5:     0x7f6e1fa8bd28 - std::io::Write::write_fmt::h86bffabfad56f13c
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/io/mod.rs:1657:15
   6:     0x7f6e1fa9f977 - std::sys_common::backtrace::_print::hd28d8aed16472cc0
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f6e1fa9f977 - std::sys_common::backtrace::print::h8f98cdd641cb45a3
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f6e1fa9f977 - std::panicking::default_hook::{{closure}}::h729dcf0a13bd0685
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/panicking.rs:295:22
   9:     0x7f6e1fa9f63f - std::panicking::default_hook::h5f6c637024d9ad69
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/panicking.rs:314:9
  10:     0x7f6e20281681 - rustc_driver[a83f25a8e01ca780]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f6e09755b53 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::he8a1bd5160cef008
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/alloc/src/boxed.rs:1868:9
  12:     0x7f6e0983300c - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}::h637e0d7901ff76cc
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/proc_macro/src/bridge/client.rs:319:21
  13:     0x7f6e0975e360 - std::panicking::update_hook::{{closure}}::hc2c7d7d5dad1f0ae
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/panicking.rs:258:41
  14:     0x7f6e1faa0255 - std::panicking::rust_panic_with_hook::h46cff6766bf99e7c
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/panicking.rs:702:17
  15:     0x7f6e1fa9ff07 - std::panicking::begin_panic_handler::{{closure}}::h0e775b2aa2b67693
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/panicking.rs:588:13
  16:     0x7f6e1fa9bea4 - std::sys_common::backtrace::__rust_end_short_backtrace::h1863dd104b065b9d
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/sys_common/backtrace.rs:138:18
  17:     0x7f6e1fa9fc09 - rust_begin_unwind
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/panicking.rs:584:5
  18:     0x7f6e1fa67b93 - core::panicking::panic_fmt::hfdeb0fcb6ce506f4
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/core/src/panicking.rs:143:14
  19:     0x7f6e2137260c - core[efe43fe86f1c620a]::panicking::panic_display::<&str>
  20:     0x7f6e229ed3dd - <rustc_errors[6e799cab4439a167]::HandlerInner>::flush_delayed
  21:     0x7f6e229eb89d - <rustc_errors[6e799cab4439a167]::HandlerInner as core[efe43fe86f1c620a]::ops::drop::Drop>::drop
  22:     0x7f6e221135e6 - core[efe43fe86f1c620a]::ptr::drop_in_place::<rustc_session[3b88a4bcbf196e76]::parse::ParseSess>
  23:     0x7f6e22115fda - <alloc[61df3a55352cbfc0]::rc::Rc<rustc_session[3b88a4bcbf196e76]::session::Session> as core[efe43fe86f1c620a]::ops::drop::Drop>::drop
  24:     0x7f6e221062ac - core[efe43fe86f1c620a]::ptr::drop_in_place::<rustc_interface[9582d0c3479cfa46]::interface::Compiler>
  25:     0x7f6e22106ac1 - rustc_span[20d03c4744d90449]::with_source_map::<core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>, rustc_interface[9582d0c3479cfa46]::interface::create_compiler_and_run<core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>, rustc_driver[a83f25a8e01ca780]::run_compiler::{closure#1}>::{closure#1}>
  26:     0x7f6e221032d3 - rustc_interface[9582d0c3479cfa46]::interface::create_compiler_and_run::<core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>, rustc_driver[a83f25a8e01ca780]::run_compiler::{closure#1}>
  27:     0x7f6e220e94e2 - std[3d6e7d7423cf4afe]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[9582d0c3479cfa46]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[9582d0c3479cfa46]::interface::run_compiler<core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>, rustc_driver[a83f25a8e01ca780]::run_compiler::{closure#1}>::{closure#0}, core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>>::{closure#0}, core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>>
  28:     0x7f6e220e6c29 - <<std[3d6e7d7423cf4afe]::thread::Builder>::spawn_unchecked_<rustc_interface[9582d0c3479cfa46]::util::setup_callbacks_and_run_in_thread_pool_with_globals<rustc_interface[9582d0c3479cfa46]::interface::run_compiler<core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>, rustc_driver[a83f25a8e01ca780]::run_compiler::{closure#1}>::{closure#0}, core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>>::{closure#0}, core[efe43fe86f1c620a]::result::Result<(), rustc_errors[6e799cab4439a167]::ErrorReported>>::{closure#1} as core[efe43fe86f1c620a]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  29:     0x7f6e1faabca3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf9ab37ec9b510857
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/alloc/src/boxed.rs:1854:9
  30:     0x7f6e1faabca3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha1991051ebf83b9d
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/alloc/src/boxed.rs:1854:9
  31:     0x7f6e1faabca3 - std::sys::unix::thread::Thread::new::thread_start::h5d1d180c2a38668b
                               at /rustc/0c292c9667f1b202a9150d58bdd2e89e3e803996/library/std/src/sys/unix/thread.rs:108:17
  32:     0x7f6e1f5ebea5 - start_thread
  33:     0x7f6e1f10c9fd - __clone
  34:                0x0 - <unknown>

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 1.60.0-nightly (0c292c966 2022-02-08) running on x86_64-unknown-linux-gnu

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 `rocket`

Backtrace

<backtrace>

Noticed this when trying to build a project using Rocket. I have confirmed that using nightly-2022-02-07 does in fact compile and work.

[ehuss]

Thanks for the report! I'm going to close as a duplicate of #93831 as it looks like there is some discussion over there.