ICE: failed to normalize std::option::Option<Alias(Projection ...

auto-reduced (treereduce-rust):

use std::hint::black_box;

trait Func {
    type Ret: Id;
}

trait Id {
    type Assoc;
}
impl Id for u32 {}
impl Id for u32 {}

impl<F: FnOnce() -> R, R: Id> Func for F {
    type Ret = R;
}

fn bar() -> impl Copy + Id {
    0u32
}

struct Foo<T: Func> {
    _func: T,
    value: Option<<<T as Func>::Ret as Id>::Assoc>,
}

fn main() {
    let mut fn_def = black_box(Foo {
        _func: bar,
        value: None,
    });
    let fn_ptr = black_box(Foo {
        _func: bar as fn() -> _,
        value: None,
    });

    fn_def.value = fn_ptr.value;
}

original:

use std::hint::black_box;

trait Func {
    type Ret: Id;
}

trait Id {
    type Assoc;
}
impl Id for u32 {
    type Assoc = u32;
}
impl Id for u32 {
    type Assoc = i32;
}

impl<F: FnOnce() -> R, R: Id> Func for F {
    type Ret = R;
}

#[inline(always)]
fn bar() -> impl Copy + Id {
    0u32
}

struct Foo<T: Func> {
    _func: T,
    value: Option<<<T as Func>::Ret as Id>::Assoc>,
}

fn main() {
    let mut fn_def = black_box(Foo {
        _func: bar,
        value: None,
    });
    let fn_ptr = black_box(Foo {
        _func: bar as fn() -> _,
        value: None,
    });
    
    fn_def.value = fn_ptr.value;
    black_box(Foo {
        _func: bar,
        value: None,
    });
}

Version information

rustc 1.78.0-nightly (c7beecf3e 2024-03-05)
binary: rustc
commit-hash: c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e
commit-date: 2024-03-05
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc

Program output

error[E0119]: conflicting implementations of trait `Id` for type `u32`
  --> /tmp/icemaker_global_tempdir.Vcuzw2RFrTGI/rustc_testrunner_tmpdir_reporting.l4vSpjX9SkGn/mvce.rs:11:1
   |
10 | impl Id for u32 {}
   | --------------- first implementation here
11 | impl Id for u32 {}
   | ^^^^^^^^^^^^^^^ conflicting implementation for `u32`

error: internal compiler error: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:187:90: Failed to normalize std::option::Option<Alias(Projection, AliasTy { args: [Alias(Projection, AliasTy { args: [Binder(fn() -> u32, [])], def_id: DefId(0:5 ~ mvce[edfe]::Func::Ret) })], def_id: DefId(0:7 ~ mvce[edfe]::Id::Assoc) })>, maybe try to call `try_normalize_erasing_regions` instead

thread 'rustc' panicked at compiler/rustc_middle/src/util/bug.rs:35:44:
Box<dyn Any>
stack backtrace:
   0:     0x7f454338c754 - std::backtrace_rs::backtrace::libunwind::trace::hb3ca6a58ed9e0cab
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
   1:     0x7f454338c754 - std::backtrace_rs::backtrace::trace_unsynchronized::h327ee65d2c5d0ca7
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f454338c754 - std::sys_common::backtrace::_print_fmt::h8a71adbcae5a9442
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f454338c754 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5069361c3741e3bd
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f45433ddb2c - core::fmt::rt::Argument::fmt::hc76ed39d719dd67d
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/core/src/fmt/rt.rs:142:9
   5:     0x7f45433ddb2c - core::fmt::write_internal::h7c84a75384687dd4
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/core/src/fmt/mod.rs:1126:17
   6:     0x7f4543381167 - core::fmt::write::h269ee61a459584fc
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/core/src/fmt/mod.rs:1108:67
   7:     0x7f4543381167 - std::io::Write::write_fmt::h8eeafb0d3c9d6dcf
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/io/mod.rs:1846:15
   8:     0x7f454338c504 - std::sys_common::backtrace::_print::h9ab859621d08b838
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/sys_common/backtrace.rs:47:5
   9:     0x7f454338c504 - std::sys_common::backtrace::print::h276f59edd5cafd51
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/sys_common/backtrace.rs:34:9
  10:     0x7f454338f10b - std::panicking::default_hook::{{closure}}::hb04a76c354ad4ca2
  11:     0x7f454338ee67 - std::panicking::default_hook::h13aec473440bd413
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/panicking.rs:292:9
  12:     0x7f45462804cc - std[8dbd9ad68df9295b]::panicking::update_hook::<alloc[3b906e9cacb41ed6]::boxed::Box<rustc_driver_impl[46903fbbfbd2d4f2]::install_ice_hook::{closure#0}>>::{closure#0}
  13:     0x7f454338f822 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::hb8d4d85a716e33a7
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/alloc/src/boxed.rs:2030:9
  14:     0x7f454338f822 - std::panicking::rust_panic_with_hook::hd5a905865100487a
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/panicking.rs:783:13
  15:     0x7f45462ac9a4 - std[8dbd9ad68df9295b]::panicking::begin_panic::<rustc_errors[3b280157a1a56311]::ExplicitBug>::{closure#0}
  16:     0x7f45462a98c6 - std[8dbd9ad68df9295b]::sys_common::backtrace::__rust_end_short_backtrace::<std[8dbd9ad68df9295b]::panicking::begin_panic<rustc_errors[3b280157a1a56311]::ExplicitBug>::{closure#0}, !>
  17:     0x7f45462a95a6 - std[8dbd9ad68df9295b]::panicking::begin_panic::<rustc_errors[3b280157a1a56311]::ExplicitBug>
  18:     0x7f45462b6131 - <rustc_errors[3b280157a1a56311]::diagnostic::BugAbort as rustc_errors[3b280157a1a56311]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  19:     0x7f454668e10c - <rustc_errors[3b280157a1a56311]::DiagCtxt>::bug::<alloc[3b906e9cacb41ed6]::string::String>
  20:     0x7f454673257b - rustc_middle[ab69c4f92afbdebe]::util::bug::opt_span_bug_fmt::<rustc_span[1f98bb2c9ae0a849]::span_encoding::Span>::{closure#0}
  21:     0x7f454671568a - rustc_middle[ab69c4f92afbdebe]::ty::context::tls::with_opt::<rustc_middle[ab69c4f92afbdebe]::util::bug::opt_span_bug_fmt<rustc_span[1f98bb2c9ae0a849]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  22:     0x7f4546715508 - rustc_middle[ab69c4f92afbdebe]::ty::context::tls::with_context_opt::<rustc_middle[ab69c4f92afbdebe]::ty::context::tls::with_opt<rustc_middle[ab69c4f92afbdebe]::util::bug::opt_span_bug_fmt<rustc_span[1f98bb2c9ae0a849]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  23:     0x7f4544c529d0 - rustc_middle[ab69c4f92afbdebe]::util::bug::bug_fmt
  24:     0x7f454795e731 - <rustc_middle[ab69c4f92afbdebe]::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_type_ir[5a0133e54bb7004d]::fold::TypeFolder<rustc_middle[ab69c4f92afbdebe]::ty::context::TyCtxt>>::fold_ty
  25:     0x7f4547a359d7 - <rustc_mir_dataflow[4dca6c6bfb913a17]::elaborate_drops::DropCtxt<rustc_mir_transform[df1dd399e1c2956f]::elaborate_drops::Elaborator>>::elaborate_drop
  26:     0x7f454478434c - <rustc_mir_transform[df1dd399e1c2956f]::elaborate_drops::ElaborateDrops as rustc_middle[ab69c4f92afbdebe]::mir::MirPass>::run_pass
  27:     0x7f454761400f - rustc_mir_transform[df1dd399e1c2956f]::pass_manager::run_passes_inner
  28:     0x7f4547d25bc6 - rustc_mir_transform[df1dd399e1c2956f]::mir_drops_elaborated_and_const_checked
  29:     0x7f4547d254e1 - rustc_query_impl[6d84502f9670cd53]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[6d84502f9670cd53]::query_impl::mir_drops_elaborated_and_const_checked::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ab69c4f92afbdebe]::query::erase::Erased<[u8; 8usize]>>
  30:     0x7f45477474b8 - rustc_query_system[2567e3f9f30a9009]::query::plumbing::try_execute_query::<rustc_query_impl[6d84502f9670cd53]::DynamicConfig<rustc_query_system[2567e3f9f30a9009]::query::caches::VecCache<rustc_span[1f98bb2c9ae0a849]::def_id::LocalDefId, rustc_middle[ab69c4f92afbdebe]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[6d84502f9670cd53]::plumbing::QueryCtxt, false>
  31:     0x7f4547746d8c - rustc_query_impl[6d84502f9670cd53]::query_impl::mir_drops_elaborated_and_const_checked::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f45482e893a - rustc_interface[4f9ebc0114c1dc52]::passes::analysis
  33:     0x7f45482e8119 - rustc_query_impl[6d84502f9670cd53]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[6d84502f9670cd53]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[ab69c4f92afbdebe]::query::erase::Erased<[u8; 1usize]>>
  34:     0x7f4548317b25 - rustc_query_system[2567e3f9f30a9009]::query::plumbing::try_execute_query::<rustc_query_impl[6d84502f9670cd53]::DynamicConfig<rustc_query_system[2567e3f9f30a9009]::query::caches::SingleCache<rustc_middle[ab69c4f92afbdebe]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[6d84502f9670cd53]::plumbing::QueryCtxt, false>
  35:     0x7f4548317889 - rustc_query_impl[6d84502f9670cd53]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f4548326842 - rustc_interface[4f9ebc0114c1dc52]::interface::run_compiler::<core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>, rustc_driver_impl[46903fbbfbd2d4f2]::run_compiler::{closure#0}>::{closure#0}
  37:     0x7f45485f0446 - std[8dbd9ad68df9295b]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[4f9ebc0114c1dc52]::util::run_in_thread_with_globals<rustc_interface[4f9ebc0114c1dc52]::util::run_in_thread_pool_with_globals<rustc_interface[4f9ebc0114c1dc52]::interface::run_compiler<core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>, rustc_driver_impl[46903fbbfbd2d4f2]::run_compiler::{closure#0}>::{closure#0}, core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>>::{closure#0}, core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>>
  38:     0x7f45485f0272 - <<std[8dbd9ad68df9295b]::thread::Builder>::spawn_unchecked_<rustc_interface[4f9ebc0114c1dc52]::util::run_in_thread_with_globals<rustc_interface[4f9ebc0114c1dc52]::util::run_in_thread_pool_with_globals<rustc_interface[4f9ebc0114c1dc52]::interface::run_compiler<core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>, rustc_driver_impl[46903fbbfbd2d4f2]::run_compiler::{closure#0}>::{closure#0}, core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>>::{closure#0}, core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[8c889010effea61c]::result::Result<(), rustc_span[1f98bb2c9ae0a849]::ErrorGuaranteed>>::{closure#1} as core[8c889010effea61c]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  39:     0x7f4543398f85 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h24c0cfbfedc1fa18
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/alloc/src/boxed.rs:2016:9
  40:     0x7f4543398f85 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h4b4e456aeb7e2c2b
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/alloc/src/boxed.rs:2016:9
  41:     0x7f4543398f85 - std::sys::pal::unix::thread::Thread::new::thread_start::hd6ad0feb9d6b2058
                               at /rustc/c7beecf3e3cef7a8226a99aec4e4f6bfc114ba8e/library/std/src/sys/pal/unix/thread.rs:108:17
  42:     0x7f454318055a - <unknown>
  43:     0x7f45431fda3c - <unknown>
  44:                0x0 - <unknown>

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 1.78.0-nightly (c7beecf3e 2024-03-05) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [mir_drops_elaborated_and_const_checked] elaborating drops for `main`
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0119`.

@oli-obk

Regressed in #120847 cc @oli-obk

on beta:

error[E0119]: conflicting implementations of trait `Id` for type `u32`
  --> /tmp/im/6D5DCD6BEEA9C6F8503D479EDB2B94D2C111E432766CB91E1C9E18F452DF092D.rs:13:1
   |
10 | impl Id for u32 {
   | --------------- first implementation here
...
13 | impl Id for u32 {
   | ^^^^^^^^^^^^^^^ conflicting implementation for `u32`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0119`.

Rollup merge of rust-lang#126620 - oli-obk:taint_errors, r=fee1-dead

Unrolled build for rust-lang#126620

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ICE: failed to normalize `std::option::Option<Alias(Projection ...` #122044

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ICE: failed to normalize std::option::Option<Alias(Projection ... #122044

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matthiaskrgr commented on Mar 5, 2024

matthiaskrgr commented on Mar 5, 2024

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ICE: failed to normalize `std::option::Option<Alias(Projection ...` #122044