ICE: delay_span_bug const-construct-call.rs with mir-opt-level=2

[matthiaskrgr]

Code

code from ./src/test/ui/consts/const_constructor/const-construct-call.rs

#![cfg_attr(const_fn, feature(const_fn))]

// Ctor(..) is transformed to Ctor { 0: ... } in HAIR lowering, so directly
// calling constructors doesn't require them to be const.

type ExternalType = std::panic::AssertUnwindSafe<(Option<i32>, Result<i32, bool>)>;

const fn call_external_constructors_in_local_vars() -> ExternalType {
    let f = Some;
    let g = Err;
    let h = std::panic::AssertUnwindSafe;
    let x = f(5);
    let y = g(false);
    let z = h((x, y));
    z
}

const CALL_EXTERNAL_CONSTRUCTORS_IN_LOCAL_VARS: ExternalType = {
    let f = Some;
    let g = Err;
    let h = std::panic::AssertUnwindSafe;
    let x = f(5);
    let y = g(false);
    let z = h((x, y));
    z
};


fn main() {
    assert_eq!(
        (call_external_constructors_in_local_vars().0,),
        (CALL_EXTERNAL_CONSTRUCTORS_IN_LOCAL_VARS.0,)
    );
}

Meta

rustc @ 664fcd3

Error output

RUST_BACKTRACE=full ./build/x86_64-unknown-linux-gnu/stage2/bin/rustc ./src/test/ui/consts/const_constructor/const-construct-call.rs -Zmir-opt-level=2

error: internal compiler error: error during interning should later cause validation failure
  --> ./src/test/ui/consts/const_constructor/const-construct-call.rs:16:19
   |
16 |     let z = h((x, y));
   |                   ^

error: internal compiler error: error during interning should later cause validation failure
  --> ./src/test/ui/consts/const_constructor/const-construct-call.rs:16:15
   |
16 |     let z = h((x, y));
   |               ^^^^^^

error: internal compiler error: error during interning should later cause validation failure
   --> /home/matthias/vcs/github/rust/src/libstd/panic.rs:190:1
    |
190 | pub struct AssertUnwindSafe<T>(#[stable(feature = "catch_unwind", since = "1.9.0")] pub T);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: internal compiler error: error during interning should later cause validation failure
  --> ./src/test/ui/consts/const_constructor/const-construct-call.rs:17:5
   |
17 |     z
   |     ^

thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/lib.rs:366:17
stack backtrace:

Backtrace

error: internal compiler error: error during interning should later cause validation failure
  --> ./src/test/ui/consts/const_constructor/const-construct-call.rs:16:19
   |
16 |     let z = h((x, y));
   |                   ^

error: internal compiler error: error during interning should later cause validation failure
  --> ./src/test/ui/consts/const_constructor/const-construct-call.rs:16:15
   |
16 |     let z = h((x, y));
   |               ^^^^^^

error: internal compiler error: error during interning should later cause validation failure
   --> /home/matthias/vcs/github/rust/src/libstd/panic.rs:190:1
    |
190 | pub struct AssertUnwindSafe<T>(#[stable(feature = "catch_unwind", since = "1.9.0")] pub T);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: internal compiler error: error during interning should later cause validation failure
  --> ./src/test/ui/consts/const_constructor/const-construct-call.rs:17:5
   |
17 |     z
   |     ^

thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/lib.rs:366:17
stack backtrace:
   0:     0x7f62dc1a0da7 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h6321961b115ad0ed
   1:     0x7f62dc1ecacd - core::fmt::write::h65255e7874586eb2
   2:     0x7f62dc16fb15 - std::io::Write::write_fmt::h2bb22b139579a2ee
   3:     0x7f62dc1830b0 - std::panicking::default_hook::{{closure}}::h7148d55d8fc14777
   4:     0x7f62dc182dfa - std::panicking::default_hook::h0efe9af18be782dc
   5:     0x7f62ddb1f153 - rustc_driver::report_ice::hfd0fa22509dd31ed
   6:     0x7f62dc18379c - std::panicking::rust_panic_with_hook::h3927854bf3e90637
   7:     0x7f62e1bbc09e - std::panicking::begin_panic::h8403099e8fc58511
   8:     0x7f62e1bc6dfe - <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop::h5f5494b6c3d74ec2
   9:     0x7f62ddb64256 - core::ptr::drop_in_place::h0e133354b600ff56
  10:     0x7f62ddb6f7d6 - <alloc::rc::Rc<T> as core::ops::drop::Drop>::drop::hbc25d3d2bfed6b41
  11:     0x7f62ddafdf8d - core::ptr::drop_in_place::h92b501bcb6da9fde
  12:     0x7f62ddae3d95 - rustc_interface::interface::run_compiler_in_existing_thread_pool::h03e608bcbd3c7d88
  13:     0x7f62ddb30860 - rustc_ast::attr::with_globals::ha3a08bb414c4a8b6
  14:     0x7f62ddb31d4a - std::sys_common::backtrace::__rust_begin_short_backtrace::h4ed2765ed1f89ac8
  15:     0x7f62ddae77ee - core::ops::function::FnOnce::call_once{{vtable.shim}}::h60fb29569624bd70
  16:     0x7f62dc183f2a - std::sys::unix::thread::Thread::new::thread_start::h61e3081ddeb255e9
  17:     0x7f62dbeb046f - start_thread
  18:     0x7f62dbfcd3d3 - clone
  19:                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/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.45.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: -Z mir-opt-level=2

query stack during panic:
end of query stack

[RalfJung]

Might be caused by #71665? That should have reduced the number of ICEs, not increased it, but who knows.^^