thread 'rustc' panicked at 'no errors encountered even though delay_span_bug issued'

[Nonius]

Code

https://github.com/bolcom/Rust_bug_report

Error output

➜ bug_report git:(master) RUST_BACKTRACE=1 cargo build
Compiling bug_report v0.1.0 (/Users/.../bug_report)
warning: Error finalizing incremental compilation session directory /Users/.../bug_report/target/debug/incremental/bug_report-q9q8kckyvbau/s-fvgzxe1lfy-v4s6o6-working: No such file or directory (os error 2)

warning: 1 warning emitted

error: internal compiler error: failed to process buffered lint here
--> /Users/.../.cargo/registry/src/github.com-1ecc6299db9ec823/failure-0.1.8/src/macros.rs:12:40
|
10 | / macro_rules! bail {
11 | | ($e:expr) => {
12 | | return Err($crate::err_msg($e));
| | ^
13 | | };
... |
16 | | };
17 | | }
| |_- in this expansion of failure::bail!
|
::: src/main.rs:20:22
|
20 | async move { failure::bail!("compiler bug") }
| ------------------------------ in this macro invocation
|
= note: delayed at /rustc/b122908617436af187252572ed5db96850551380/compiler/rustc_lint/src/early.rs:384:18

thread 'rustc' panicked at 'no errors encountered even though delay_span_bug issued', compiler/rustc_errors/src/lib.rs:974:13
stack backtrace:
0: _rust_begin_unwind
1: std::panicking::begin_panic_fmt
2: rustc_errors::HandlerInner::flush_delayed
3: <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop
4: core::ptr::drop_in_place<rustc_session::parse::ParseSess>
5: <alloc::rc::Rc as core::ops::drop::Drop>::drop
6: core::ptr::drop_in_place<rustc_interface::interface::Compiler>
7: rustc_span::with_source_map
8: rustc_interface::interface::create_compiler_and_run
note: Some details are omitted, run with RUST_BACKTRACE=full for a verbose 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 1.51.0-nightly (b122908 2021-01-29) running on x86_64-apple-darwin

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

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

query stack during panic:
end of query stack

Details

If I change the rust-toolchain to nightly-2021-01-29 then it works.

[jonas-schievink]

duplicate of #81531