ice: effects: assertion failed: constant / lifetime

[matthiaskrgr]

auto-reduced (treereduce-rust):

#![feature(effects)]

use std::marker::Destruct;

const fn check<T: ~const Destruct>(_: T) {}

original:

// known-bug: #110395

// revisions: stock precise
#![feature(const_trait_impl)]
#![feature(const_mut_refs)]
#![cfg_attr(precise, feature(const_precise_live_drops))]
#![feature(effects)]

use std::marker::{Destruct, PhantomData};

pub struct Color<const WHITE: (fn(),)>;

impl Drop for NonTrivialDrop {
    fn drop(&mut self) {
        println!("Non trivial drop");
    }
}

struct ConstImplWithDropGlue(NonTrivialDrop);

impl const Drop for ConstImplWithDropGlue {
    fn drop(&mut self) {}
}

const fn check<T: ~const Destruct>(_: T) {}

macro_rules! check_all {
    ($($exp:expr),*$(,)?) => {$(
        const _: () = check($exp);
    )*};
}

check_all! {
    NonTrivialDrop,
    ConstImplWithDropGlue(NonTrivialDrop),
}

fn main() {}

Version information

rustc 1.75.0-nightly (698db856d 2023-10-26)
binary: rustc
commit-hash: 698db856de0b67313ddcb96b6599598058489ea9
commit-date: 2023-10-26
host: x86_64-unknown-linux-gnu
release: 1.75.0-nightly
LLVM version: 17.0.3

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcrate-attr=feature(effects)

Program output

error[E0658]: const trait impls are experimental
 --> /tmp/icemaker_global_tempdir.zf1EZKgSPxgi/rustc_testrunner_tmpdir_reporting.ytGYsxhOGnyY/mvce.rs:3:19
  |
3 | const fn check<T: ~const Destruct>(_: T) {}
  |                   ^^^^^^
  |
  = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
  = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.zf1EZKgSPxgi/rustc_testrunner_tmpdir_reporting.ytGYsxhOGnyY/mvce.rs:3:44
  |
3 | const fn check<T: ~const Destruct>(_: T) {}
  |                                            ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.zf1EZKgSPxgi/rustc_testrunner_tmpdir_reporting.ytGYsxhOGnyY/mvce.rs`

error[E0658]: use of unstable library feature 'const_trait_impl'
 --> /tmp/icemaker_global_tempdir.zf1EZKgSPxgi/rustc_testrunner_tmpdir_reporting.ytGYsxhOGnyY/mvce.rs:1:5
  |
1 | use std::marker::Destruct;
  |     ^^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
  = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable

error[E0658]: use of unstable library feature 'const_trait_impl'
 --> /tmp/icemaker_global_tempdir.zf1EZKgSPxgi/rustc_testrunner_tmpdir_reporting.ytGYsxhOGnyY/mvce.rs:3:26
  |
3 | const fn check<T: ~const Destruct>(_: T) {}
  |                          ^^^^^^^^
  |
  = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information
  = help: add `#![feature(const_trait_impl)]` to the crate attributes to enable

thread 'rustc' panicked at compiler/rustc_hir_analysis/src/astconv/generics.rs:352:25:
assertion `left == right` failed
  left: "constant"
 right: "lifetime"
stack backtrace:
   0:     0x7fa1bac17e0c - std::backtrace_rs::backtrace::libunwind::trace::h26f9c796037cce52
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7fa1bac17e0c - std::backtrace_rs::backtrace::trace_unsynchronized::hee359840b9dafeac
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fa1bac17e0c - std::sys_common::backtrace::_print_fmt::h9bb6ca31bc75c5d0
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fa1bac17e0c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1232efd9e71af7ee
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7fa1bac7a070 - core::fmt::rt::Argument::fmt::hf0a8fd66ca5e69d7
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/core/src/fmt/rt.rs:142:9
   5:     0x7fa1bac7a070 - core::fmt::write::haad2ec2532166927
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/core/src/fmt/mod.rs:1117:17
   6:     0x7fa1bac0bc9f - std::io::Write::write_fmt::ha23c136682b46710
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/io/mod.rs:1762:15
   7:     0x7fa1bac17bf4 - std::sys_common::backtrace::_print::h95f3c84329b5c92d
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7fa1bac17bf4 - std::sys_common::backtrace::print::h20e8e2976e5bbe94
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7fa1bac1a887 - std::panicking::default_hook::{{closure}}::h1eae7995acc746d3
  10:     0x7fa1bac1a5ef - std::panicking::default_hook::h4d5fabf853e7ef7b
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/panicking.rs:292:9
  11:     0x7fa1b7cce120 - std[460b5be3558c375d]::panicking::update_hook::<alloc[693971052a9e8422]::boxed::Box<rustc_driver_impl[e72fe5bfa41da330]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7fa1bac1afc8 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h843de2e1901f057d
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/alloc/src/boxed.rs:2021:9
  13:     0x7fa1bac1afc8 - std::panicking::rust_panic_with_hook::hd10c46bdf894a0ee
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/panicking.rs:735:13
  14:     0x7fa1bac1ad1e - std::panicking::begin_panic_handler::{{closure}}::h45eb8defe1b35d80
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/panicking.rs:609:13
  15:     0x7fa1bac182d6 - std::sys_common::backtrace::__rust_end_short_backtrace::h3ddbcc723f81873e
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/sys_common/backtrace.rs:170:18
  16:     0x7fa1bac1aa82 - rust_begin_unwind
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/panicking.rs:597:5
  17:     0x7fa1bac76795 - core::panicking::panic_fmt::h48abbd5c08ea998c
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/core/src/panicking.rs:72:14
  18:     0x7fa1bac76d0b - core::panicking::assert_failed_inner::h9f251a4ea4c836b7
  19:     0x7fa1b7d7f55b - core[2a54af29626ba4c5]::panicking::assert_failed::<&str, &str>
  20:     0x7fa1b968db22 - <dyn rustc_hir_analysis[4ab1543de9c19fcd]::astconv::AstConv>::instantiate_poly_trait_ref_inner
  21:     0x7fa1b9688c5d - <dyn rustc_hir_analysis[4ab1543de9c19fcd]::astconv::AstConv>::instantiate_poly_trait_ref
  22:     0x7fa1b904eaea - rustc_hir_analysis[4ab1543de9c19fcd]::collect::predicates_of::gather_explicit_predicates_of
  23:     0x7fa1b904bf5e - rustc_query_impl[b93e503e69ee3f1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b93e503e69ee3f1]::query_impl::explicit_predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 24usize]>>
  24:     0x7fa1b904afe2 - rustc_query_system[58175847c4e3ea34]::query::plumbing::try_execute_query::<rustc_query_impl[b93e503e69ee3f1]::DynamicConfig<rustc_query_system[58175847c4e3ea34]::query::caches::DefaultCache<rustc_span[2a5b7a2a8d495c3a]::def_id::DefId, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[b93e503e69ee3f1]::plumbing::QueryCtxt, false>
  25:     0x7fa1b904ace0 - rustc_query_impl[b93e503e69ee3f1]::query_impl::explicit_predicates_of::get_query_non_incr::__rust_end_short_backtrace
  26:     0x7fa1b904b6a3 - rustc_hir_analysis[4ab1543de9c19fcd]::collect::predicates_defined_on
  27:     0x7fa1b904b593 - rustc_query_impl[b93e503e69ee3f1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b93e503e69ee3f1]::query_impl::predicates_defined_on::dynamic_query::{closure#2}::{closure#0}, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 24usize]>>
  28:     0x7fa1b904afb7 - rustc_query_system[58175847c4e3ea34]::query::plumbing::try_execute_query::<rustc_query_impl[b93e503e69ee3f1]::DynamicConfig<rustc_query_system[58175847c4e3ea34]::query::caches::DefaultCache<rustc_span[2a5b7a2a8d495c3a]::def_id::DefId, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[b93e503e69ee3f1]::plumbing::QueryCtxt, false>
  29:     0x7fa1b904ab20 - rustc_query_impl[b93e503e69ee3f1]::query_impl::predicates_defined_on::get_query_non_incr::__rust_end_short_backtrace
  30:     0x7fa1b9049be9 - rustc_hir_analysis[4ab1543de9c19fcd]::collect::predicates_of::predicates_of
  31:     0x7fa1b9049ad3 - rustc_query_impl[b93e503e69ee3f1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b93e503e69ee3f1]::query_impl::predicates_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 24usize]>>
  32:     0x7fa1b904af8a - rustc_query_system[58175847c4e3ea34]::query::plumbing::try_execute_query::<rustc_query_impl[b93e503e69ee3f1]::DynamicConfig<rustc_query_system[58175847c4e3ea34]::query::caches::DefaultCache<rustc_span[2a5b7a2a8d495c3a]::def_id::DefId, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 24usize]>>, false, false, false>, rustc_query_impl[b93e503e69ee3f1]::plumbing::QueryCtxt, false>
  33:     0x7fa1b904abfe - rustc_query_impl[b93e503e69ee3f1]::query_impl::predicates_of::get_query_non_incr::__rust_end_short_backtrace
  34:     0x7fa1b92de086 - <rustc_hir_analysis[4ab1543de9c19fcd]::collect::CollectItemTypesVisitor as rustc_hir[2e6132ac8cc970b0]::intravisit::Visitor>::visit_item
  35:     0x7fa1b92dc4e8 - rustc_hir_analysis[4ab1543de9c19fcd]::collect::collect_mod_item_types
  36:     0x7fa1b92dc47d - rustc_query_impl[b93e503e69ee3f1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b93e503e69ee3f1]::query_impl::collect_mod_item_types::dynamic_query::{closure#2}::{closure#0}, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 0usize]>>
  37:     0x7fa1b96f2734 - rustc_query_system[58175847c4e3ea34]::query::plumbing::try_execute_query::<rustc_query_impl[b93e503e69ee3f1]::DynamicConfig<rustc_query_system[58175847c4e3ea34]::query::caches::DefaultCache<rustc_span[2a5b7a2a8d495c3a]::def_id::LocalModDefId, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[b93e503e69ee3f1]::plumbing::QueryCtxt, false>
  38:     0x7fa1b96f2203 - rustc_query_impl[b93e503e69ee3f1]::query_impl::collect_mod_item_types::get_query_non_incr::__rust_end_short_backtrace
  39:     0x7fa1b921fe26 - rustc_hir_analysis[4ab1543de9c19fcd]::check_crate
  40:     0x7fa1b96385d6 - rustc_interface[f97d1d56abeae6a6]::passes::analysis
  41:     0x7fa1b9637ff5 - rustc_query_impl[b93e503e69ee3f1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[b93e503e69ee3f1]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 1usize]>>
  42:     0x7fa1b991d266 - rustc_query_system[58175847c4e3ea34]::query::plumbing::try_execute_query::<rustc_query_impl[b93e503e69ee3f1]::DynamicConfig<rustc_query_system[58175847c4e3ea34]::query::caches::SingleCache<rustc_middle[405ee4a693ef0c6a]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[b93e503e69ee3f1]::plumbing::QueryCtxt, false>
  43:     0x7fa1b991d095 - rustc_query_impl[b93e503e69ee3f1]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  44:     0x7fa1b9b022cd - std[460b5be3558c375d]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[f97d1d56abeae6a6]::util::run_in_thread_with_globals<rustc_interface[f97d1d56abeae6a6]::interface::run_compiler<core[2a54af29626ba4c5]::result::Result<(), rustc_span[2a5b7a2a8d495c3a]::ErrorGuaranteed>, rustc_driver_impl[e72fe5bfa41da330]::run_compiler::{closure#1}>::{closure#0}, core[2a54af29626ba4c5]::result::Result<(), rustc_span[2a5b7a2a8d495c3a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2a54af29626ba4c5]::result::Result<(), rustc_span[2a5b7a2a8d495c3a]::ErrorGuaranteed>>
  45:     0x7fa1b9b015b3 - <<std[460b5be3558c375d]::thread::Builder>::spawn_unchecked_<rustc_interface[f97d1d56abeae6a6]::util::run_in_thread_with_globals<rustc_interface[f97d1d56abeae6a6]::interface::run_compiler<core[2a54af29626ba4c5]::result::Result<(), rustc_span[2a5b7a2a8d495c3a]::ErrorGuaranteed>, rustc_driver_impl[e72fe5bfa41da330]::run_compiler::{closure#1}>::{closure#0}, core[2a54af29626ba4c5]::result::Result<(), rustc_span[2a5b7a2a8d495c3a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[2a54af29626ba4c5]::result::Result<(), rustc_span[2a5b7a2a8d495c3a]::ErrorGuaranteed>>::{closure#1} as core[2a54af29626ba4c5]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  46:     0x7fa1bac25d95 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h685ade75afd0fa00
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/alloc/src/boxed.rs:2007:9
  47:     0x7fa1bac25d95 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7f8eddf0418f773b
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/alloc/src/boxed.rs:2007:9
  48:     0x7fa1bac25d95 - std::sys::unix::thread::Thread::new::thread_start::hd2a483094951da8e
                               at /rustc/698db856de0b67313ddcb96b6599598058489ea9/library/std/src/sys/unix/thread.rs:108:17
  49:     0x7fa1b50aa9eb - <unknown>
  50:     0x7fa1b512e7cc - <unknown>
  51:                0x0 - <unknown>

error: 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 1.75.0-nightly (698db856d 2023-10-26) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z crate-attr=feature(effects) -Z dump-mir-dir=dir

query stack during panic:
#0 [explicit_predicates_of] computing explicit predicates of `check`
#1 [predicates_defined_on] computing predicates of `check`
#2 [predicates_of] computing predicates of `check`
#3 [collect_mod_item_types] collecting item types in top-level module
#4 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors

Some errors have detailed explanations: E0601, E0658.
For more information about an error, try `rustc --explain E0601`.

[matthiaskrgr]

#117171 cc @fee1-dead ^^

[compiler-errors]

Would be nice if you uplifted the -Zcrate-attr=feature(effects) into the minimal repro, I think I've mentioned this before but it's easy to miss :)

[matthiaskrgr]

@compiler-errors flags are added now, at the bottom though as to not shift all the lines around which would get the mvce/error output out of sync and might cause other problems I suspect (iirc specifying a flag multiple times via file AND cmdline arg still breaks things)
matthiaskrgr/icemaker@a982242

[compiler-errors]

I don't see any flags added so I've added them myself.

[jruderman]

Further reduced:

#![feature(effects)]
#![feature(const_trait_impl)]

trait Foo {}

const fn check<T: ~const Foo>() {}

fn main() {}

[matthiaskrgr]

#![feature(derive_const)]
#![feature(const_trait_impl, effects)]

#[derive_const(PartialEq, Eq)]
pub struct Reverse<T>(T);

const fn foo(a: Reverse<i32>, b: Reverse<i32>) -> bool {
    a == b
}

fn main() {}