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ICE when evaluating trait selection obligation #13862

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mciantyre opened this issue Dec 21, 2024 · 0 comments · May be fixed by #13863
Open

ICE when evaluating trait selection obligation #13862

mciantyre opened this issue Dec 21, 2024 · 0 comments · May be fixed by #13863
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C-bug Category: Clippy is not doing the correct thing I-ICE Issue: Clippy panicked, giving an Internal Compilation Error (ICE) ❄️

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@mciantyre
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mciantyre commented Dec 21, 2024 •
edited
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Summary

The example below causes a panic in clippy 1.83. It will also cause a panic in older clippy releases 1.82 and 1.81. If it helps, I set up a repository here containing the example and reproductions.

The ICE disappears if we apply this patch to the example, removing the Channel's generic DMA_INST.

#![no_std]

use core::{
    future::Future,
    pin::Pin,
    task::{Context, Poll},
};

pub struct Channel<const DMA_INST: u8>;

pub struct Write<'a, const DMA_INST: u8> {
    _channel: &'a Channel<DMA_INST>,
}

impl<const DMA_INST: u8> Future for Write<'_, DMA_INST> {
    type Output = ();
    fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
        Poll::Ready(())
    }
}

pub struct Periph;

impl Periph {
    pub fn dma_write<'a, const DMA_INST: u8>(
        &'a mut self,
        _channel: &'a mut Channel<DMA_INST>,
    ) -> Write<'a, DMA_INST> {
        Write { _channel }
    }
}

Version

rustc 1.83.0 (90b35a623 2024-11-26)
binary: rustc
commit-hash: 90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf
commit-date: 2024-11-26
host: x86_64-apple-darwin
release: 1.83.0
LLVM version: 19.1.1

Error output

Backtrace 

thread 'rustc' panicked at compiler/rustc_middle/src/ty/sty.rs:363:36:
called `Option::unwrap()` on a `None` value
stack backtrace:
 0:        0x10eb70026 - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h0fd572ca60ee9a4e
 1:        0x10bd5ce83 - core::fmt::write::hbc078725bba6692a
 2:        0x10eb63db2 - std::io::Write::write_fmt::h100f2ae009a3df53
 3:        0x10eb6fe72 - std::sys::backtrace::BacktraceLock::print::hf0d5a155265a9dd5
 4:        0x10eb7274e - std::panicking::default_hook::{{closure}}::h5499fb85b118791b
 5:        0x10eb7259c - std::panicking::default_hook::h3be9b9b36bd75e8f
 6:        0x10c95821d - std[a09b67190130f411]::panicking::update_hook::<alloc[285955a53c51d5e7]::boxed::Box<rustc_driver_impl[64a020ea63dda478]::install_ice_hook::{closure#0}>>::{closure#0}
 7:        0x10eb73018 - std::panicking::rust_panic_with_hook::h10014b4a7f4c072b
 8:        0x10eb72c55 - std::panicking::begin_panic_handler::{{closure}}::hc871510d12acad65
 9:        0x10eb704d9 - std::sys::backtrace::__rust_end_short_backtrace::hca0d49bc0c1e56d3
10:        0x10eb728cc - _rust_begin_unwind
11:        0x1117f075f - core::panicking::panic_fmt::haa8e13f18984c8e5
12:        0x1117f0804 - core::panicking::panic::hc2aae38099a8d6cf
13:        0x1117f06d8 - core::option::unwrap_failed::hb6226bf7a36b0a5a
14:        0x10d79dab8 - <rustc_middle[205dbd0098ce5d0a]::ty::sty::ParamConst>::find_ty_from_env
15:        0x10e951ec0 - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_predicate_recursively::{closure#0}::{closure#0}
16:        0x10e950fc2 - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_predicate_recursively
17:        0x10e9546ad - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}
18:        0x10e8dea20 - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluation_probe::<<rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_candidate::{closure#0}::{closure#0}>
19:        0x10e953e5f - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_trait_predicate_recursively::{closure#0}::{closure#1}
20:        0x10e95288a - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_trait_predicate_recursively::{closure#0}
21:        0x10e95129c - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_predicate_recursively::{closure#0}::{closure#0}
22:        0x10e950fc2 - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_predicate_recursively
23:        0x10e8dee72 - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluation_probe::<<rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_root_obligation::{closure#0}>::{closure#0}
24:        0x10e8de8d5 - <rustc_trait_selection[3f465ba9c174d506]::traits::select::SelectionContext>::evaluate_root_obligation
25:        0x10ea001e7 - rustc_traits[d5556349cb396c96]::evaluate_obligation::evaluate_obligation
26:        0x10e13ed5c - rustc_query_impl[15b127f51fbcb8d2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[15b127f51fbcb8d2]::query_impl::evaluate_obligation::dynamic_query::{closure#2}::{closure#0}, rustc_middle[205dbd0098ce5d0a]::query::erase::Erased<[u8; 2usize]>>
27:        0x10e0f5ddf - <rustc_query_impl[15b127f51fbcb8d2]::query_impl::evaluate_obligation::dynamic_query::{closure#2} as core[239cfdf43388e8c4]::ops::function::FnOnce<(rustc_middle[205dbd0098ce5d0a]::ty::context::TyCtxt, rustc_type_ir[41f7d002a1ed06dd]::canonical::Canonical<rustc_middle[205dbd0098ce5d0a]::ty::context::TyCtxt, rustc_middle[205dbd0098ce5d0a]::ty::ParamEnvAnd<rustc_middle[205dbd0098ce5d0a]::ty::predicate::Predicate>>)>>::call_once
28:        0x10dfb1a65 - rustc_query_system[1984efb36f276886]::query::plumbing::try_execute_query::<rustc_query_impl[15b127f51fbcb8d2]::DynamicConfig<rustc_query_system[1984efb36f276886]::query::caches::DefaultCache<rustc_type_ir[41f7d002a1ed06dd]::canonical::Canonical<rustc_middle[205dbd0098ce5d0a]::ty::context::TyCtxt, rustc_middle[205dbd0098ce5d0a]::ty::ParamEnvAnd<rustc_middle[205dbd0098ce5d0a]::ty::predicate::Predicate>>, rustc_middle[205dbd0098ce5d0a]::query::erase::Erased<[u8; 2usize]>>, false, false, false>, rustc_query_impl[15b127f51fbcb8d2]::plumbing::QueryCtxt, true>
29:        0x10e1fc9d7 - rustc_query_impl[15b127f51fbcb8d2]::query_impl::evaluate_obligation::get_query_incr::__rust_end_short_backtrace
30:        0x10e93fea1 - <rustc_infer[4a5b37671f7872af]::infer::InferCtxt as rustc_trait_selection[3f465ba9c174d506]::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation
31:        0x101903950 - clippy_utils[a707c304bec98fbe]::ty::implements_trait
32:        0x101609b32 - clippy_lints[9cbea354f1d3b5a8]::doc::missing_headers::check
33:        0x10160c119 - <clippy_lints[9cbea354f1d3b5a8]::doc::Documentation as rustc_lint[4e10caf754b7c4f2]::passes::LateLintPass>::check_attributes
34:        0x10d47db56 - <rustc_lint[4e10caf754b7c4f2]::late::LateContextAndPass<rustc_lint[4e10caf754b7c4f2]::late::RuntimeCombinedLateLintPass>>::with_lint_attrs::<<rustc_lint[4e10caf754b7c4f2]::late::LateContextAndPass<rustc_lint[4e10caf754b7c4f2]::late::RuntimeCombinedLateLintPass> as rustc_hir[a51b4994050fe052]::intravisit::Visitor>::visit_item::{closure#0}>
35:        0x10d3a6a78 - rustc_hir[a51b4994050fe052]::intravisit::walk_mod::<rustc_lint[4e10caf754b7c4f2]::late::LateContextAndPass<rustc_lint[4e10caf754b7c4f2]::late::RuntimeCombinedLateLintPass>>
36:        0x10d48579d - rustc_lint[4e10caf754b7c4f2]::late::check_crate
37:        0x10d34e626 - rustc_interface[35c538ee69994c62]::passes::analysis
38:        0x10e140f3a - rustc_query_impl[15b127f51fbcb8d2]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[15b127f51fbcb8d2]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[205dbd0098ce5d0a]::query::erase::Erased<[u8; 1usize]>>
39:        0x10df94cbc - rustc_query_system[1984efb36f276886]::query::plumbing::try_execute_query::<rustc_query_impl[15b127f51fbcb8d2]::DynamicConfig<rustc_query_system[1984efb36f276886]::query::caches::SingleCache<rustc_middle[205dbd0098ce5d0a]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[15b127f51fbcb8d2]::plumbing::QueryCtxt, true>
40:        0x10e15a8be - rustc_query_impl[15b127f51fbcb8d2]::query_impl::analysis::get_query_incr::__rust_end_short_backtrace
41:        0x10c90ec3b - <rustc_interface[35c538ee69994c62]::queries::QueryResult<&rustc_middle[205dbd0098ce5d0a]::ty::context::GlobalCtxt>>::enter::<core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>, rustc_driver_impl[64a020ea63dda478]::run_compiler::{closure#0}::{closure#1}::{closure#5}>
42:        0x10c9569b2 - rustc_interface[35c538ee69994c62]::interface::run_compiler::<core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>, rustc_driver_impl[64a020ea63dda478]::run_compiler::{closure#0}>::{closure#1}
43:        0x10c947343 - std[a09b67190130f411]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[35c538ee69994c62]::util::run_in_thread_with_globals<rustc_interface[35c538ee69994c62]::interface::run_compiler<core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>, rustc_driver_impl[64a020ea63dda478]::run_compiler::{closure#0}>::{closure#1}, core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>>
44:        0x10c95c7cc - <<std[a09b67190130f411]::thread::Builder>::spawn_unchecked_<rustc_interface[35c538ee69994c62]::util::run_in_thread_with_globals<rustc_interface[35c538ee69994c62]::interface::run_compiler<core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>, rustc_driver_impl[64a020ea63dda478]::run_compiler::{closure#0}>::{closure#1}, core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[239cfdf43388e8c4]::result::Result<(), rustc_span[a545ab19381ab211]::ErrorGuaranteed>>::{closure#1} as core[239cfdf43388e8c4]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
45:        0x10eb7dcbb - std::sys::pal::unix::thread::Thread::new::thread_start::h08338ace24ce5652
46:     0x7ff81a8a218b - __pthread_start

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new?template=ice.yml

note: rustc 1.83.0 (90b35a623 2024-11-26) running on x86_64-apple-darwin

note: compiler flags: --crate-type lib -C embed-bitcode=no -C debuginfo=2 -C split-debuginfo=unpacked -C incremental=[REDACTED]

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [evaluate_obligation] evaluating trait selection obligation `Write<'_, DMA_INST>: core::future::future::Future`
#1 [analysis] running analysis passes on this crate
end of query stack
note: Clippy version: clippy 0.1.83 (90b35a62 2024-11-26)

error: could not compile `clippy-ice` (lib)

@mciantyre mciantyre added C-bug Category: Clippy is not doing the correct thing I-ICE Issue: Clippy panicked, giving an Internal Compilation Error (ICE) ❄️ labels Dec 21, 2024
@y21 y21 linked a pull request Dec 21, 2024 that will close this issue
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C-bug Category: Clippy is not doing the correct thing I-ICE Issue: Clippy panicked, giving an Internal Compilation Error (ICE) ❄️
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use the correct ParamEnv when checking future's output type y21/rust-clippy
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