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Description
auto-reduced (treereduce-rust):
//@compile-flags: --crate-type=lib
#![feature(unsafe_binders)]
use std::unsafe_binder::wrap_binder;
//
fn propagate() -> unsafe<'a> i32 {
unsafe {
let x = 1;
let binder: unsafe<featurea> i32 = wrap_binder!(x);
binder
}
}original:
// skip-filecheck
//@ test-mir-pass: GVN
// EMIT_MIR gvn_on_unsafe_binder.test.GVN.diff
// EMIT_MIR gvn_on_unsafe_binder.propagate.GVN.diff
#![feature(unsafe_binders)]
use std::unsafe_binder::wrap_binder;
// Test for ICE <https://github.com/rust-lang/rust/issues/137846>.
fn test() {
unsafe {
let x = 1;
let binder: unsafe<'a> &'a i32 = wrap_binder!(&x);
}
}
// Test that GVN propagates const values through unsafe binders.
//
// The lifetime `'a` is redundant (and doesn't print when we print out the type).
// However, we need it so that rustfmt doesn't rip out the `unsafe<>` part for now.
fn propagate() -> unsafe<'a> i32 {
unsafe {
let x = 1;
let binder: unsafe<featurea> i32 = wrap_binder!(x);
binder
}
}Version information
rustc 1.89.0-nightly (28174fc1a 2025-05-20)
binary: rustc
commit-hash: 28174fc1a0525888615c8bce8f4ecec13c85ecc6
commit-date: 2025-05-20
host: x86_64-unknown-linux-gnu
release: 1.89.0-nightly
LLVM version: 20.1.5
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --crate-type=lib
Program output
warning: the feature `unsafe_binders` is incomplete and may not be safe to use and/or cause compiler crashes
--> /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:1:12
|
1 | #![feature(unsafe_binders)]
| ^^^^^^^^^^^^^^
|
= note: see issue #130516 <https://github.com/rust-lang/rust/issues/130516> for more information
= note: `#[warn(incomplete_features)]` on by default
warning: type parameter `featurea` should have an upper camel case name
--> /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:10:28
|
10 | let binder: unsafe<featurea> i32 = wrap_binder!(x);
| ^^^^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Featurea`
|
= note: `#[warn(non_camel_case_types)]` on by default
warning: function `propagate` is never used
--> /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:7:4
|
7 | fn propagate() -> unsafe<'a> i32 {
| ^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: 3 warnings emitted
note: no errors encountered even though delayed bugs were created
note: those delayed bugs will now be shown as internal compiler errors
error: internal compiler error: late-bound type parameter not allowed on function pointer types
--> /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:10:28
|
10 | let binder: unsafe<featurea> i32 = wrap_binder!(x);
| ^^^^^^^^
|
note: delayed at compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs:2504:30
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::diagnostic::Diag>::emit_unless
4: rustc_hir_analysis::collect::resolve_bound_vars::deny_non_region_late_bound
5: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_ty
6: rustc_hir::intravisit::walk_block::<rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext>
7: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_fn
8: rustc_hir::intravisit::walk_item::<rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext>
9: <rustc_hir_analysis::collect::resolve_bound_vars::BoundVarContext as rustc_hir::intravisit::Visitor>::visit_item
10: rustc_hir_analysis::collect::resolve_bound_vars::resolve_bound_vars
11: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::resolve_bound_vars::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_data_structures::vec_cache::VecCache<rustc_hir::hir_id::OwnerId, rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
13: rustc_query_impl::query_impl::resolve_bound_vars::get_query_non_incr::__rust_end_short_backtrace
14: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::late_bound_vars_map::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
15: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_data_structures::vec_cache::VecCache<rustc_hir::hir_id::OwnerId, rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
16: rustc_query_impl::query_impl::late_bound_vars_map::get_query_non_incr::__rust_end_short_backtrace
17: <rustc_middle::ty::context::TyCtxt>::late_bound_vars
18: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_fn_ty
19: rustc_hir_analysis::collect::lower_fn_sig_recovering_infer_ret_ty
20: rustc_hir_analysis::collect::fn_sig
21: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::fn_sig::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 24]>>
22: <rustc_query_impl::query_impl::fn_sig::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::DefId)>>::call_once
23: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefIdCache<rustc_middle::query::erase::Erased<[u8; 24]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
24: rustc_query_impl::query_impl::fn_sig::get_query_non_incr::__rust_end_short_backtrace
25: <rustc_hir_analysis::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
26: rustc_hir_analysis::check::wfcheck::check_well_formed
27: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_well_formed::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
28: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 1]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
29: rustc_query_impl::query_impl::check_well_formed::get_query_non_incr::__rust_end_short_backtrace
30: rustc_hir_analysis::check::wfcheck::check_mod_type_wf
31: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::check_mod_type_wf::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 1]>>
32: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::DefaultCache<rustc_span::def_id::LocalModDefId, rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
33: rustc_query_impl::query_impl::check_mod_type_wf::get_query_non_incr::__rust_end_short_backtrace
34: rustc_hir_analysis::check_crate
35: rustc_interface::passes::run_required_analyses
36: rustc_interface::passes::analysis
37: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
38: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
39: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
40: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
41: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
42: std::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
43: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
44: std::sys::pal::unix::thread::Thread::new::thread_start
45: <unknown>
46: <unknown>
--> /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:10:28
|
10 | let binder: unsafe<featurea> i32 = wrap_binder!(x);
| ^^^^^^^^
error: internal compiler error: unexpected generic param: GenericParam { hir_id: HirId(DefId(0:4 ~ mvce[4db4]::propagate).9), def_id: DefId(0:6 ~ mvce[4db4]::propagate::featurea), name: Plain(featurea#0), span: /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:10:28: 10:36 (#0), pure_wrt_drop: false, kind: Type { default: None, synthetic: false }, colon_span: None, source: Binder }
--> /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:10:28
|
10 | let binder: unsafe<featurea> i32 = wrap_binder!(x);
| ^^^^^^^^
|
note: delayed at compiler/rustc_hir_typeck/src/writeback.rs:301:22
0: <rustc_errors::DiagCtxtInner>::emit_diagnostic
1: <rustc_errors::DiagCtxtHandle>::emit_diagnostic
2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic::EmissionGuarantee>::emit_producing_guarantee
3: <rustc_errors::DiagCtxtHandle>::span_delayed_bug::<rustc_span::span_encoding::Span, alloc::string::String>
4: <rustc_hir_typeck::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_generic_param.cold
5: <rustc_hir_typeck::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_ty
6: <rustc_hir_typeck::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_local
7: <rustc_hir_typeck::writeback::WritebackCx as rustc_hir::intravisit::Visitor>::visit_expr
8: <rustc_hir_typeck::fn_ctxt::FnCtxt>::resolve_type_vars_in_body
9: rustc_hir_typeck::typeck_with_inspect::{closure#0}
10: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::typeck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_data_structures::vec_cache::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>, rustc_query_system::dep_graph::graph::DepNodeIndex>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
12: rustc_query_impl::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
13: rustc_hir_analysis::check_crate
14: rustc_interface::passes::run_required_analyses
15: rustc_interface::passes::analysis
16: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 0]>>
17: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 0]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
18: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
19: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}
20: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
21: std::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>
22: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
23: std::sys::pal::unix::thread::Thread::new::thread_start
24: <unknown>
25: <unknown>
--> /tmp/icemaker_global_tempdir.RvqJiZ8HHoz7/rustc_testrunner_tmpdir_reporting.UkivTDuCeQWZ/mvce.rs:10:28
|
10 | let binder: unsafe<featurea> i32 = wrap_binder!(x);
| ^^^^^^^^
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: please make sure that you have updated to the latest nightly
note: rustc 1.89.0-nightly (28174fc1a 2025-05-20) running on x86_64-unknown-linux-gnu
note: compiler flags: --crate-type lib -Z dump-mir-dir=dir
query stack during panic:
end of query stack
@rustbot label +F-unsafe_binders