Closed
Description
auto-reduced (treereduce-rust):
trait FromResidual<R = <Self as Try>::Residual> {}
trait Try {
type Residual;
}
fn w<U>() {
let b: &dyn FromResidual = &();
}
fn main() {}original:
trait FromResidual<R = <Self as Try>::Residual> {
fn y(self) -> isize;
}
trait Try {
type Residual;
}
fn w<U>() {
let b: &dyn FromResidual = &();
//~^ ERROR: the trait `FromResidual` is not dyn compatible
//~| ERROR: the trait `FromResidual` is not dyn compatible
}
fn main() {}Version information
rustc 1.86.0-nightly (3cd8fcbf8 2025-01-23)
binary: rustc
commit-hash: 3cd8fcbf87bd28a1f31be000ca906fb66f4d451d
commit-date: 2025-01-23
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.7
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc
Program output
warning: trait `FromResidual` is never used
--> /tmp/icemaker_global_tempdir.48NMtvPAjGxe/rustc_testrunner_tmpdir_reporting.LRiH8Fwh0jxX/mvce.rs:1:7
|
1 | trait FromResidual<R = <Self as Try>::Residual> {}
| ^^^^^^^^^^^^
|
= note: `#[warn(dead_code)]` on by default
warning: trait `Try` is never used
--> /tmp/icemaker_global_tempdir.48NMtvPAjGxe/rustc_testrunner_tmpdir_reporting.LRiH8Fwh0jxX/mvce.rs:3:7
|
3 | trait Try {
| ^^^
warning: function `w` is never used
--> /tmp/icemaker_global_tempdir.48NMtvPAjGxe/rustc_testrunner_tmpdir_reporting.LRiH8Fwh0jxX/mvce.rs:7:4
|
7 | fn w<U>() {
| ^
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: trait object trait bounds reference `Self`
--> /tmp/icemaker_global_tempdir.48NMtvPAjGxe/rustc_testrunner_tmpdir_reporting.LRiH8Fwh0jxX/mvce.rs:8:17
|
8 | let b: &dyn FromResidual = &();
| ^^^^^^^^^^^^
|
note: delayed at compiler/rustc_hir_analysis/src/hir_ty_lowering/dyn_compatibility.rs:245:51
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, &str>
4: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_trait_object_ty
5: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_ty
6: <dyn rustc_hir_analysis::hir_ty_lowering::HirTyLowerer>::lower_ty
7: <rustc_hir_typeck::gather_locals::GatherLocalsVisitor as rustc_hir::intravisit::Visitor>::visit_local
8: <rustc_hir_typeck::gather_locals::GatherLocalsVisitor as rustc_hir::intravisit::Visitor>::visit_expr
9: rustc_hir_typeck::check::check_fn
10: rustc_hir_typeck::typeck_with_inspect::{closure#0}
11: 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]>>
12: 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>
13: rustc_query_impl::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
14: <rustc_middle::hir::map::Map>::par_body_owners::<rustc_hir_analysis::check_crate::{closure#4}>::{closure#0}
15: rustc_hir_analysis::check_crate
16: rustc_interface::passes::run_required_analyses
17: rustc_interface::passes::analysis
18: 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]>>
19: 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>
20: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
21: 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}
22: rustc_interface::interface::run_compiler::<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}
23: 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}, ()>
24: <<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}
25: std::sys::pal::unix::thread::Thread::new::thread_start
26: <unknown>
27: <unknown>
--> /tmp/icemaker_global_tempdir.48NMtvPAjGxe/rustc_testrunner_tmpdir_reporting.LRiH8Fwh0jxX/mvce.rs:8:17
|
8 | let b: &dyn FromResidual = &();
| ^^^^^^^^^^^^
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 1.86.0-nightly (3cd8fcbf8 2025-01-23) running on x86_64-unknown-linux-gnu
query stack during panic:
end of query stack