ICE: compiler error is promoted to ICE with -Zunpretty=expanded: "unrecognized ABI not caught in lowering"

[matthiaskrgr]

Code

./src/test/ui/codemap_tests/unicode.rs

extern "路濫狼á́́" fn foo() {} //~ ERROR invalid ABI

fn main() { }

Meta

rustc --version --verbose:

rustc 1.64.0-nightly (87588a2af 2022-07-13)
binary: rustc
commit-hash: 87588a2afd9ca903366f0deaf84d805f34469384
commit-date: 2022-07-13
host: x86_64-unknown-linux-gnu
release: 1.64.0-nightly
LLVM version: 14.0.6

Error output

without flags, rustc just reports this as an error, but with rustc ./src/test/ui/codemap_tests/unicode.rs -Zunpretty=expanded it becomes an internal compiler error for some reason

<output>

Backtrace

#![feature(prelude_import)]
#![no_std]
#[prelude_import]
use ::std::prelude::rust_2015::*;
#[macro_use]
extern crate std;
extern "路濫狼á́́" fn foo() {}
//~ ERROR invalid ABI

fn main() {}
error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: unrecognized ABI not caught in lowering: 路濫狼á́́
 --> ./src/test/ui/codemap_tests/unicode.rs:1:8
  |
1 | extern "路濫狼á́́" fn foo() {} //~ ERROR invalid ABI
  |        ^^^^^^^^^
  |
  = note: delayed at compiler/rustc_ast_passes/src/feature_gate.rs:277:54

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1425:13
stack backtrace:
   0:     0x7ff73a0a2850 - std::backtrace_rs::backtrace::libunwind::trace::h546e34b136647819
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x7ff73a0a2850 - std::backtrace_rs::backtrace::trace_unsynchronized::h76e576fe0a1ec65e
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7ff73a0a2850 - std::sys_common::backtrace::_print_fmt::h3489fbb9d5d01094
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7ff73a0a2850 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h401cfc97a3c2f247
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7ff73a0fbe2c - core::fmt::write::h327c921ac5532dc9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/core/src/fmt/mod.rs:1198:17
   5:     0x7ff73a093e15 - std::io::Write::write_fmt::h334c1fe5d85b41a9
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/io/mod.rs:1672:15
   6:     0x7ff73a0a54e1 - std::sys_common::backtrace::_print::hddc5656bc817cc55
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7ff73a0a54e1 - std::sys_common::backtrace::print::h46adcb0dcb6fbe81
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7ff73a0a54e1 - std::panicking::default_hook::{{closure}}::h7e55301ce91fa17d
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/panicking.rs:295:22
   9:     0x7ff73a0a51b3 - std::panicking::default_hook::he24b412fa8dea167
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/panicking.rs:314:9
  10:     0x7ff73a947e04 - rustc_driver[24990f24c5f9557a]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7ff73a0a5cb6 - std::panicking::rust_panic_with_hook::hd6be56b55800f278
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/panicking.rs:702:17
  12:     0x7ff73baef0d1 - std[66dc708de7974585]::panicking::begin_panic::<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>::{closure#0}
  13:     0x7ff73baef046 - std[66dc708de7974585]::sys_common::backtrace::__rust_end_short_backtrace::<std[66dc708de7974585]::panicking::begin_panic<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>::{closure#0}, !>
  14:     0x7ff73bae82f6 - std[66dc708de7974585]::panicking::begin_panic::<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>
  15:     0x7ff73baeb326 - std[66dc708de7974585]::panic::panic_any::<rustc_errors[7a9b9cc96f052d83]::ExplicitBug>
  16:     0x7ff73d3d9b93 - <rustc_errors[7a9b9cc96f052d83]::HandlerInner as core[734affb1a3eaf053]::ops::drop::Drop>::drop
  17:     0x7ff73cb0331b - core[734affb1a3eaf053]::ptr::drop_in_place::<rustc_session[214423f9b1c42db1]::parse::ParseSess>
  18:     0x7ff73cb05ed3 - <alloc[66d1c5d1fabcc843]::rc::Rc<rustc_session[214423f9b1c42db1]::session::Session> as core[734affb1a3eaf053]::ops::drop::Drop>::drop
  19:     0x7ff73cae88bd - core[734affb1a3eaf053]::ptr::drop_in_place::<rustc_interface[d9e16a24b5464548]::interface::Compiler>
  20:     0x7ff73cae6944 - rustc_span[b8cb56592c4d9b67]::with_source_map::<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_interface[d9e16a24b5464548]::interface::create_compiler_and_run<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#1}>
  21:     0x7ff73cb02880 - rustc_interface[d9e16a24b5464548]::interface::create_compiler_and_run::<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>
  22:     0x7ff73cb16a02 - <scoped_tls[93927b52d599628f]::ScopedKey<rustc_span[b8cb56592c4d9b67]::SessionGlobals>>::set::<rustc_interface[d9e16a24b5464548]::interface::run_compiler<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>
  23:     0x7ff73cae8cff - std[66dc708de7974585]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[d9e16a24b5464548]::util::run_in_thread_pool_with_globals<rustc_interface[d9e16a24b5464548]::interface::run_compiler<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>
  24:     0x7ff73cb02cd9 - <<std[66dc708de7974585]::thread::Builder>::spawn_unchecked_<rustc_interface[d9e16a24b5464548]::util::run_in_thread_pool_with_globals<rustc_interface[d9e16a24b5464548]::interface::run_compiler<core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>, rustc_driver[24990f24c5f9557a]::run_compiler::{closure#1}>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>::{closure#0}, core[734affb1a3eaf053]::result::Result<(), rustc_errors[7a9b9cc96f052d83]::ErrorGuaranteed>>::{closure#1} as core[734affb1a3eaf053]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  25:     0x7ff73a0af703 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h332a3f23c5b3d8bc
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/alloc/src/boxed.rs:1934:9
  26:     0x7ff73a0af703 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h33b3da7f4496df00
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/alloc/src/boxed.rs:1934:9
  27:     0x7ff73a0af703 - std::sys::unix::thread::Thread::new::thread_start::hf48274d01b2ded65
                               at /rustc/87588a2afd9ca903366f0deaf84d805f34469384/library/std/src/sys/unix/thread.rs:108:17
  28:     0x7ff739e8054d - <unknown>
  29:     0x7ff739f05874 - clone
  30:                0x0 - <unknown>

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 1.64.0-nightly (87588a2af 2022-07-13) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z unpretty=expanded

query stack during panic:
end of query stack