Regression ICE with const generics when updating from `7c3872e6b 2021-06-24` to `7a16cfcff 2021-07-11`

[Buzzec]

Compiled fine on 7c3872e6b 2021-06-24, updated to 7a16cfcff 2021-07-11 and got ICE.
Using const generic features.

Code

Github link

Meta

rustc --version --verbose:

rustc 1.53.0 (53cb7b09b 2021-06-17)
binary: rustc
commit-hash: 53cb7b09b00cbea8754ffb78e7e3cb521cb8af4b
commit-date: 2021-06-17
host: x86_64-unknown-linux-gnu
release: 1.53.0
LLVM version: 12.0.1

Error output

/home/buzzec/.cargo/bin/cargo +nightly test --color=always --message-format=json-diagnostic-rendered-ansi --no-run
   Compiling space_rpg v0.1.0 (/home/buzzec/CLionProjects/space_rpg)
error: internal compiler error: /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/compiler/rustc_middle/src/ty/consts.rs:195:32: expected bits of units::unit_dims::UnitDims, got Const {
    ty: units::unit_dims::UnitDims,
    val: Value(
        ByRef {
            alloc: Allocation {
                bytes: [
                    1,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    2,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    3,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    4,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    5,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    6,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    7,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                ],
                relocations: Relocations(
                    SortedMap {
                        data: [],
                    },
                ),
                init_mask: InitMask {
                    blocks: [
                        72057594037927935,
                    ],
                    len: Size {
                        raw: 56,
                    },
                },
                align: Align {
                    pow2: 3,
                },
                mutability: Not,
                extra: (),
            },
            offset: Size {
                raw: 0,
            },
        },
    ),
}

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1035:9
stack backtrace:
   0:     0x7fea34ac8f20 - std::backtrace_rs::backtrace::libunwind::trace::h706b838f5bbd876b
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7fea34ac8f20 - std::backtrace_rs::backtrace::trace_unsynchronized::hc15f29ae7822b7b8
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fea34ac8f20 - std::sys_common::backtrace::_print_fmt::h7c580c971f91926c
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fea34ac8f20 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2a772198c4032452
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7fea34b36d0c - core::fmt::write::h9a6d9c74526a6c1b
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/core/src/fmt/mod.rs:1115:17
   5:     0x7fea34aba665 - std::io::Write::write_fmt::h00f38d9eb2c32e02
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/io/mod.rs:1663:15
   6:     0x7fea34accc3b - std::sys_common::backtrace::_print::h5b3c171e6f864ae4
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7fea34accc3b - std::sys_common::backtrace::print::h93b9e9ed2a98e611
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7fea34accc3b - std::panicking::default_hook::{{closure}}::hd8da92bb68d520c5
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/panicking.rs:208:50
   9:     0x7fea34acc711 - std::panicking::default_hook::hdbc8b2951c5afbab
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/panicking.rs:225:9
  10:     0x7fea352a2ee1 - rustc_driver::DEFAULT_HOOK::{{closure}}::{{closure}}::h9115897f26ef0e94
  11:     0x7fea34acd469 - std::panicking::rust_panic_with_hook::h8a4c841655926f4e
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/panicking.rs:626:17
  12:     0x7fea3627c3fb - std::panicking::begin_panic::{{closure}}::hac8dad9bdcca0cfd
  13:     0x7fea3627c396 - std::sys_common::backtrace::__rust_end_short_backtrace::h99db2744a599084f
  14:     0x7fea3627d67f - std::panicking::begin_panic::h41e6b8bec3069875
  15:     0x7fea362929ad - std::panic::panic_any::h0c9457317d749814
  16:     0x7fea3629580a - rustc_errors::HandlerInner::bug::h1af6e8cc9c30e551
  17:     0x7fea362952c0 - rustc_errors::Handler::bug::h92bd20b9466c2cbf
  18:     0x7fea361051ec - rustc_middle::ty::context::tls::with_opt::h1c4490ff766d8628
  19:     0x7fea36105a80 - rustc_middle::util::bug::opt_span_bug_fmt::ha8d3313fb245704f
  20:     0x7fea361059f6 - rustc_middle::util::bug::bug_fmt::h7d94326a7f647af1
  21:     0x7fea369c4ade - rustc_codegen_ssa::debuginfo::type_names::push_generic_params_internal::h023c4e6ede752e45
  22:     0x7fea369be17e - rustc_codegen_ssa::debuginfo::type_names::compute_debuginfo_type_name::h554f60ebcc2b3436
  23:     0x7fea363c8f40 - rustc_codegen_llvm::debuginfo::metadata::type_metadata::h20e77a5a61e1260c
  24:     0x7fea363db88f - rustc_codegen_llvm::debuginfo::<impl rustc_codegen_ssa::traits::debuginfo::DebugInfoMethods for rustc_codegen_llvm::context::CodegenCx>::create_dbg_var::hfc309198a701ce07
  25:     0x7fea363f7814 - rustc_codegen_ssa::mir::codegen_mir::hba46b235138f9c53
  26:     0x7fea363e0ae6 - rustc_codegen_ssa::base::codegen_instance::h5ce3a13b251f2241
  27:     0x7fea363e4d46 - <rustc_middle::mir::mono::MonoItem as rustc_codegen_ssa::mono_item::MonoItemExt>::define::h3096383390f22ff0
  28:     0x7fea363ee18d - rustc_codegen_llvm::base::compile_codegen_unit::module_codegen::h2d90d12cab20a933
  29:     0x7fea36e26d9a - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task::h45893157b175f074
  30:     0x7fea36e3e347 - rustc_codegen_llvm::base::compile_codegen_unit::h1ce3124a5e9e6cea
  31:     0x7fea36e2b406 - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h64257afe5c81b421
  32:     0x7fea36dade4c - rustc_interface::passes::QueryContext::enter::hd468a0e11b4f6832
  33:     0x7fea36da5a16 - rustc_interface::queries::Queries::ongoing_codegen::h469a87d34d18ff55
  34:     0x7fea36d8480f - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h322d262b9c0938c4
  35:     0x7fea36d7389c - rustc_span::with_source_map::hef536b13581cfdf1
  36:     0x7fea36d8597a - rustc_interface::interface::create_compiler_and_run::h268d650d50fb09f1
  37:     0x7fea36d78ac9 - scoped_tls::ScopedKey<T>::set::h01e1202900a6e691
  38:     0x7fea36d759aa - std::sys_common::backtrace::__rust_begin_short_backtrace::h32f903e490a897c1
  39:     0x7fea36d74235 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h3ecb73c3653fe1a0
  40:     0x7fea34ad9a17 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha8b1d5a0092467fc
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/alloc/src/boxed.rs:1572:9
  41:     0x7fea34ad9a17 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4b9f24ec4e8a879e
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/alloc/src/boxed.rs:1572:9
  42:     0x7fea34ad9a17 - std::sys::unix::thread::Thread::new::thread_start::h2a0e98fbc4ab4c32
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys/unix/thread.rs:74:17
  43:     0x7fea349fe609 - start_thread
  44:     0x7fea34912293 - clone
  45:                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 1.55.0-nightly (7a16cfcff 2021-07-11) running on x86_64-unknown-linux-gnu
note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
end of query stack
error: aborting due to previous error

error: could not compile `space_rpg`
To learn more, run the command again with --verbose.
Process finished with exit code 101

Backtrace

thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1035:9
stack backtrace:
   0:     0x7fea34ac8f20 - std::backtrace_rs::backtrace::libunwind::trace::h706b838f5bbd876b
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7fea34ac8f20 - std::backtrace_rs::backtrace::trace_unsynchronized::hc15f29ae7822b7b8
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7fea34ac8f20 - std::sys_common::backtrace::_print_fmt::h7c580c971f91926c
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7fea34ac8f20 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2a772198c4032452
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7fea34b36d0c - core::fmt::write::h9a6d9c74526a6c1b
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/core/src/fmt/mod.rs:1115:17
   5:     0x7fea34aba665 - std::io::Write::write_fmt::h00f38d9eb2c32e02
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/io/mod.rs:1663:15
   6:     0x7fea34accc3b - std::sys_common::backtrace::_print::h5b3c171e6f864ae4
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7fea34accc3b - std::sys_common::backtrace::print::h93b9e9ed2a98e611
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7fea34accc3b - std::panicking::default_hook::{{closure}}::hd8da92bb68d520c5
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/panicking.rs:208:50
   9:     0x7fea34acc711 - std::panicking::default_hook::hdbc8b2951c5afbab
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/panicking.rs:225:9
  10:     0x7fea352a2ee1 - rustc_driver::DEFAULT_HOOK::{{closure}}::{{closure}}::h9115897f26ef0e94
  11:     0x7fea34acd469 - std::panicking::rust_panic_with_hook::h8a4c841655926f4e
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/panicking.rs:626:17
  12:     0x7fea3627c3fb - std::panicking::begin_panic::{{closure}}::hac8dad9bdcca0cfd
  13:     0x7fea3627c396 - std::sys_common::backtrace::__rust_end_short_backtrace::h99db2744a599084f
  14:     0x7fea3627d67f - std::panicking::begin_panic::h41e6b8bec3069875
  15:     0x7fea362929ad - std::panic::panic_any::h0c9457317d749814
  16:     0x7fea3629580a - rustc_errors::HandlerInner::bug::h1af6e8cc9c30e551
  17:     0x7fea362952c0 - rustc_errors::Handler::bug::h92bd20b9466c2cbf
  18:     0x7fea361051ec - rustc_middle::ty::context::tls::with_opt::h1c4490ff766d8628
  19:     0x7fea36105a80 - rustc_middle::util::bug::opt_span_bug_fmt::ha8d3313fb245704f
  20:     0x7fea361059f6 - rustc_middle::util::bug::bug_fmt::h7d94326a7f647af1
  21:     0x7fea369c4ade - rustc_codegen_ssa::debuginfo::type_names::push_generic_params_internal::h023c4e6ede752e45
  22:     0x7fea369be17e - rustc_codegen_ssa::debuginfo::type_names::compute_debuginfo_type_name::h554f60ebcc2b3436
  23:     0x7fea363c8f40 - rustc_codegen_llvm::debuginfo::metadata::type_metadata::h20e77a5a61e1260c
  24:     0x7fea363db88f - rustc_codegen_llvm::debuginfo::<impl rustc_codegen_ssa::traits::debuginfo::DebugInfoMethods for rustc_codegen_llvm::context::CodegenCx>::create_dbg_var::hfc309198a701ce07
  25:     0x7fea363f7814 - rustc_codegen_ssa::mir::codegen_mir::hba46b235138f9c53
  26:     0x7fea363e0ae6 - rustc_codegen_ssa::base::codegen_instance::h5ce3a13b251f2241
  27:     0x7fea363e4d46 - <rustc_middle::mir::mono::MonoItem as rustc_codegen_ssa::mono_item::MonoItemExt>::define::h3096383390f22ff0
  28:     0x7fea363ee18d - rustc_codegen_llvm::base::compile_codegen_unit::module_codegen::h2d90d12cab20a933
  29:     0x7fea36e26d9a - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task::h45893157b175f074
  30:     0x7fea36e3e347 - rustc_codegen_llvm::base::compile_codegen_unit::h1ce3124a5e9e6cea
  31:     0x7fea36e2b406 - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h64257afe5c81b421
  32:     0x7fea36dade4c - rustc_interface::passes::QueryContext::enter::hd468a0e11b4f6832
  33:     0x7fea36da5a16 - rustc_interface::queries::Queries::ongoing_codegen::h469a87d34d18ff55
  34:     0x7fea36d8480f - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::h322d262b9c0938c4
  35:     0x7fea36d7389c - rustc_span::with_source_map::hef536b13581cfdf1
  36:     0x7fea36d8597a - rustc_interface::interface::create_compiler_and_run::h268d650d50fb09f1
  37:     0x7fea36d78ac9 - scoped_tls::ScopedKey<T>::set::h01e1202900a6e691
  38:     0x7fea36d759aa - std::sys_common::backtrace::__rust_begin_short_backtrace::h32f903e490a897c1
  39:     0x7fea36d74235 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h3ecb73c3653fe1a0
  40:     0x7fea34ad9a17 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha8b1d5a0092467fc
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/alloc/src/boxed.rs:1572:9
  41:     0x7fea34ad9a17 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4b9f24ec4e8a879e
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/alloc/src/boxed.rs:1572:9
  42:     0x7fea34ad9a17 - std::sys::unix::thread::Thread::new::thread_start::h2a0e98fbc4ab4c32
                               at /rustc/7a16cfcffc58cd6994984a2c014b0cc27ed8f66b/library/std/src/sys/unix/thread.rs:74:17
  43:     0x7fea349fe609 - start_thread
  44:     0x7fea34912293 - clone
  45:                0x0 - <unknown>

[Buzzec]

Does not occur on 7100b311d 2021-07-01:

rustc 1.55.0-nightly (7100b311d 2021-07-01)
binary: rustc
commit-hash: 7100b311df0367c4d9067687573d1396b22411df
commit-date: 2021-07-01
host: x86_64-unknown-linux-gnu
release: 1.55.0-nightly
LLVM version: 12.0.1

Does occur on 798baebde 2021-07-02

rustc 1.55.0-nightly (798baebde 2021-07-02)
binary: rustc
commit-hash: 798baebde1fe77e5a660490ec64e727a5d79970d
commit-date: 2021-07-02
host: x86_64-unknown-linux-gnu
release: 1.55.0-nightly
LLVM version: 12.0.1

[Buzzec]

I'm not the most familiar with the compiler but I think the issue lies here commit.

[Buzzec]

Also similar to #86961

[hellow554]

One thing to mention:

you are asked to provide your rust version and you provided the stable version, but in your command you are using cargo +nightly test, therefore you should provide the nightly version you're using, e.g. rustc +nightly --version --verbose

[hellow554]

MCVE:

cargo build (test is not sufficient)

#![feature(const_generics)]

#[derive(PartialEq, Eq)]
pub struct UnitDims {
    pub time: u8,
    pub length: u8,
}

pub struct UnitValue<const DIMS: UnitDims>;

impl<const DIMS: UnitDims> UnitValue<DIMS> {
    fn crash() {}
}

fn main() {
    UnitValue::<{ UnitDims { time: 1, length: 2 } }>::crash();
}

@rustbot modify labels: requires-nightly A-const-generics

[rustbot]

Error: Label needs-nightly can only be set by Rust team members

Please let @rust-lang/release know if you're having trouble with this bot.

[hellow554]

searched nightlies: from nightly-2021-06-26 to nightly-2021-07-11
regressed nightly: nightly-2021-07-03
searched commits: from 7100b31 to 798baeb
regressed commit: 2545459

bisected with cargo-bisect-rustc v0.6.0

Host triple: x86_64-unknown-linux-gnu
Reproduce with:

cargo bisect-rustc --access=github --regress=ice --without-cargo -- build

cc #85269 @dpaoliello

[Buzzec]

Fixed as of

rustc 1.55.0-nightly (74ef0c3e4 2021-07-16)
binary: rustc
commit-hash: 74ef0c3e404cc72c08b2d1e14506f90d9e877269
commit-date: 2021-07-16
host: x86_64-unknown-linux-gnu
release: 1.55.0-nightly
LLVM version: 12.0.1