ICE: `explicit deref of non-derefable type`

[matthiaskrgr]

Code

#![allow(incomplete_features)]
#![feature(ref_pat_everywhere)]

pub fn main() {
    if let Some(Some(&x)) = &Some(&Some(0)) {
        let _: u32 = x;
    }
}

Meta

rustc --version --verbose:

rustc 1.80.0-nightly (ba956ef4b 2024-05-13)
binary: rustc
commit-hash: ba956ef4b00c91579cff9b2220358ee3a46d982f
commit-date: 2024-05-13
host: x86_64-unknown-linux-gnu
release: 1.80.0-nightly
LLVM version: 18.1.4

Error output

<output>

Backtrace

error: internal compiler error: /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/compiler/rustc_hir_typeck/src/expr_use_visitor.rs:218:9: explicit deref of non-derefable type
 --> ref_pat_everywhere.rs:5:22
  |
5 |     if let Some(Some(&x)) = &Some(&Some(0)) {
  |                      ^^

thread 'rustc' panicked at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/compiler/rustc_hir_typeck/src/expr_use_visitor.rs:218:9:
Box<dyn Any>
stack backtrace:
   0:     0x759107658e55 - std::backtrace_rs::backtrace::libunwind::trace::he1c8af16e60d8ac3
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x759107658e55 - std::backtrace_rs::backtrace::trace_unsynchronized::h0ff4fb4d1fb1eafe
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x759107658e55 - std::sys_common::backtrace::_print_fmt::hda02bf9854ed434b
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x759107658e55 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2f1348356d4dd5a6
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7591076a816b - core::fmt::rt::Argument::fmt::hdfc187d135a92cff
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/core/src/fmt/rt.rs:165:63
   5:     0x7591076a816b - core::fmt::write::h2e66cd8a0d755998
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/core/src/fmt/mod.rs:1169:21
   6:     0x75910764dbef - std::io::Write::write_fmt::ha6594d6d0318bd63
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/io/mod.rs:1835:15
   7:     0x759107658c2e - std::sys_common::backtrace::_print::h7b339c0ab962de77
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x759107658c2e - std::sys_common::backtrace::print::hde9837078a8d5e94
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x75910765b649 - std::panicking::default_hook::{{closure}}::h0f2e3d59d4fc9781
  10:     0x75910765b38d - std::panicking::default_hook::h9944960cd621bbba
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/panicking.rs:298:9
  11:     0x759103eeb64f - std[2aee1e20eb236dda]::panicking::update_hook::<alloc[322764ce6b1abc47]::boxed::Box<rustc_driver_impl[b3f759d8272e082a]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x75910765bd7b - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h63db09f1011a40db
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/alloc/src/boxed.rs:2036:9
  13:     0x75910765bd7b - std::panicking::rust_panic_with_hook::hd5c6a18d84f2558b
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/panicking.rs:799:13
  14:     0x759103f1b944 - std[2aee1e20eb236dda]::panicking::begin_panic::<rustc_errors[1fa39940d3d52013]::ExplicitBug>::{closure#0}
  15:     0x759103f182e6 - std[2aee1e20eb236dda]::sys_common::backtrace::__rust_end_short_backtrace::<std[2aee1e20eb236dda]::panicking::begin_panic<rustc_errors[1fa39940d3d52013]::ExplicitBug>::{closure#0}, !>
  16:     0x759103f13856 - std[2aee1e20eb236dda]::panicking::begin_panic::<rustc_errors[1fa39940d3d52013]::ExplicitBug>
  17:     0x759103f24be1 - <rustc_errors[1fa39940d3d52013]::diagnostic::BugAbort as rustc_errors[1fa39940d3d52013]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x5b1402a0a7c8 - <rustc_errors[1fa39940d3d52013]::DiagCtxt>::span_bug::<rustc_span[18b9f7b309fe5dcc]::span_encoding::Span, alloc[322764ce6b1abc47]::string::String>
  19:     0x5b1402b17ccb - rustc_middle[6763d32431b5f193]::util::bug::opt_span_bug_fmt::<rustc_span[18b9f7b309fe5dcc]::span_encoding::Span>::{closure#0}
  20:     0x5b1402b198aa - rustc_middle[6763d32431b5f193]::ty::context::tls::with_opt::<rustc_middle[6763d32431b5f193]::util::bug::opt_span_bug_fmt<rustc_span[18b9f7b309fe5dcc]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x5b1402acbb9b - rustc_middle[6763d32431b5f193]::ty::context::tls::with_context_opt::<rustc_middle[6763d32431b5f193]::ty::context::tls::with_opt<rustc_middle[6763d32431b5f193]::util::bug::opt_span_bug_fmt<rustc_span[18b9f7b309fe5dcc]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x5b1402ac923a - rustc_middle[6763d32431b5f193]::util::bug::span_bug_fmt::<rustc_span[18b9f7b309fe5dcc]::span_encoding::Span>
  23:     0x5b1402ae4c1e - <(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId) as rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::TypeInformationCtxt>::report_error::<&str>
  24:     0x5b1402b6bb68 - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::needless_pass_by_value::MovedVariablesCtxt>>::cat_deref
  25:     0x5b1402a100b4 - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::cat_pattern::<<rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::walk_pat::{closure#0}>
  26:     0x5b1402a106a2 - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::cat_pattern::<<rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::walk_pat::{closure#0}>
  27:     0x5b1402a106a2 - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::cat_pattern::<<rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::walk_pat::{closure#0}>
  28:     0x5b1402b5c46b - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::walk_irrefutable_pat
  29:     0x5b1402b5da61 - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::walk_expr
  30:     0x5b1402b5c21c - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::consume_expr
  31:     0x5b1402b5c803 - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::walk_expr
  32:     0x5b1402b5c21c - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::consume_expr
  33:     0x5b1402b5d58e - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::walk_expr
  34:     0x5b1402b5c21c - <rustc_hir_typeck[9965755b35d13bf6]::expr_use_visitor::ExprUseVisitor<(&rustc_lint[935797b976454209]::context::LateContext, rustc_span[18b9f7b309fe5dcc]::def_id::LocalDefId), &mut clippy_lints[7545ccafa66a19d7]::escape::EscapeDelegate>>::consume_expr
  35:     0x5b1402c182c8 - <clippy_lints[7545ccafa66a19d7]::escape::BoxedLocal as rustc_lint[935797b976454209]::passes::LateLintPass>::check_fn
  36:     0x7591042c2c75 - <rustc_lint[935797b976454209]::late::LateContextAndPass<rustc_lint[935797b976454209]::late::RuntimeCombinedLateLintPass> as rustc_hir[c63ce795a895b78]::intravisit::Visitor>::visit_fn
  37:     0x7591042b1ff5 - <rustc_lint[935797b976454209]::late::LateContextAndPass<rustc_lint[935797b976454209]::late::RuntimeCombinedLateLintPass> as rustc_hir[c63ce795a895b78]::intravisit::Visitor>::visit_nested_item
  38:     0x759105d7c12a - rustc_lint[935797b976454209]::late::check_crate::{closure#0}
  39:     0x759105d7c373 - rustc_lint[935797b976454209]::late::check_crate
  40:     0x759105d82b93 - rustc_interface[378bc30a20028389]::passes::analysis
  41:     0x759105d8209b - rustc_query_impl[829470001f3ffad1]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[829470001f3ffad1]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[6763d32431b5f193]::query::erase::Erased<[u8; 1usize]>>
  42:     0x759106002ca5 - rustc_query_system[f6e0b1d5265b4ecc]::query::plumbing::try_execute_query::<rustc_query_impl[829470001f3ffad1]::DynamicConfig<rustc_query_system[f6e0b1d5265b4ecc]::query::caches::SingleCache<rustc_middle[6763d32431b5f193]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[829470001f3ffad1]::plumbing::QueryCtxt, false>
  43:     0x759106002a09 - rustc_query_impl[829470001f3ffad1]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  44:     0x759105e3ee0e - rustc_interface[378bc30a20028389]::interface::run_compiler::<core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>, rustc_driver_impl[b3f759d8272e082a]::run_compiler::{closure#0}>::{closure#1}
  45:     0x759105e04a89 - std[2aee1e20eb236dda]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[378bc30a20028389]::util::run_in_thread_with_globals<rustc_interface[378bc30a20028389]::util::run_in_thread_pool_with_globals<rustc_interface[378bc30a20028389]::interface::run_compiler<core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>, rustc_driver_impl[b3f759d8272e082a]::run_compiler::{closure#0}>::{closure#1}, core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>>::{closure#0}, core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>>
  46:     0x759105e04836 - <<std[2aee1e20eb236dda]::thread::Builder>::spawn_unchecked_<rustc_interface[378bc30a20028389]::util::run_in_thread_with_globals<rustc_interface[378bc30a20028389]::util::run_in_thread_pool_with_globals<rustc_interface[378bc30a20028389]::interface::run_compiler<core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>, rustc_driver_impl[b3f759d8272e082a]::run_compiler::{closure#0}>::{closure#1}, core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>>::{closure#0}, core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[5a1853d728d4f28b]::result::Result<(), rustc_span[18b9f7b309fe5dcc]::ErrorGuaranteed>>::{closure#2} as core[5a1853d728d4f28b]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  47:     0x759107665c1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h1118031ec204f534
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/alloc/src/boxed.rs:2022:9
  48:     0x759107665c1b - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h46a265d132dda3f6
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/alloc/src/boxed.rs:2022:9
  49:     0x759107665c1b - std::sys::pal::unix::thread::Thread::new::thread_start::hfd925ddaab3cb24c
                               at /rustc/ba956ef4b00c91579cff9b2220358ee3a46d982f/library/std/src/sys/pal/unix/thread.rs:108:17
  50:     0x759100ca955a - <unknown>
  51:     0x759100d26a3c - <unknown>
  52:                0x0 - <unknown>

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

note: please make sure that you have updated to the latest nightly

note: please attach the file at `/tmp/im/rustc-ice-2024-05-13T04_56_49-1069123.txt` to your bug report

query stack during panic:
#0 [analysis] running analysis passes on this crate
end of query stack
note: Clippy version: clippy 0.1.80 (ba956ef 2024-05-13)

error: aborting due to 1 previous error

[matthiaskrgr]

rustc repro:

#![feature(ref_pat_everywhere)]
struct Foo;

fn main() {
    || if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
        let _: u32 = x;
    };
}

[matthiaskrgr]

This ^ bisects to #124902 cc @compiler-errors

[compiler-errors]

This likely exposed a preexisting bug in ref_pat_everywhere cc @Jules-Bertholet

previously ExprUseVisitor was silently bailing when it couldn't deref a type it expected to be able to deref.

[Jules-Bertholet]

ref_pat_everywhere is most likely going to be removed, but this also reproduces with edition 2024 and ref_pat_eat_one_layer_2024:

#![feature(ref_pat_eat_one_layer_2024)]
struct Foo;

fn main() {
    || if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
        let _: u32 = x;
    };
}

@rustbot claim