Description
auto-reduced (treereduce-rust):
#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
trait Assoc {
type Output;
}
default impl<T: Clone> Assoc for T {
type Output = bool;
}
impl Assoc for u8 {}
trait Foo {}
impl Foo for <u8 as Assoc>::Output {}
impl Foo for <u16 as Assoc>::Output {}
original:
// run-pass
// Test that impls on projected self types can resolve overlap, even when the
// projections involve specialization, so long as the associated type is
// provided by the most specialized impl.
#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
trait Assoc {
type Output;
}
default impl<T:Clone> Assoc for T {
type Output = bool;
}
impl Assoc for u8 { type Assoc = u8; }
impl Assoc for u16 { type Output = u16; }
trait Foo {}
impl Assoc for u32 {}
impl Foo for <u8 as Assoc>::Output {}
impl Foo for <u16 as Assoc>::Output {}
fn main() {}Version information
rustc 1.76.0-nightly (d253bf61a 2023-12-15)
binary: rustc
commit-hash: d253bf61ad38a59cc579aee688f81a06c31283d3
commit-date: 2023-12-15
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.6
Command:
/home/matthias/.rustup/toolchains/master/bin/rustc
Program output
warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
--> /tmp/icemaker_global_tempdir.YmODNJIFWMvh/rustc_testrunner_tmpdir_reporting.mIkKiuxcepa6/mvce.rs:1:12
|
1 | #![feature(specialization)] //~ WARN the feature `specialization` is incomplete
| ^^^^^^^^^^^^^^
|
= note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
= help: consider using `min_specialization` instead, which is more stable and complete
= note: `#[warn(incomplete_features)]` on by default
error[E0601]: `main` function not found in crate `mvce`
--> /tmp/icemaker_global_tempdir.YmODNJIFWMvh/rustc_testrunner_tmpdir_reporting.mIkKiuxcepa6/mvce.rs:16:39
|
16 | impl Foo for <u16 as Assoc>::Output {}
| ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.YmODNJIFWMvh/rustc_testrunner_tmpdir_reporting.mIkKiuxcepa6/mvce.rs`
error: internal compiler error: compiler/rustc_trait_selection/src/traits/specialize/mod.rs:123:21: When translating substitutions from DefId(0:8 ~ mvce[0e9d]::{impl#1}) to DefId(0:5 ~ mvce[0e9d]::{impl#0}), the expected specialization failed to hold
thread 'rustc' panicked at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/compiler/rustc_errors/src/lib.rs:1119:75:
Box<dyn Any>
stack backtrace:
0: 0x7f146c02d45c - std::backtrace_rs::backtrace::libunwind::trace::hd6103882acf895e3
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
1: 0x7f146c02d45c - std::backtrace_rs::backtrace::trace_unsynchronized::h8bf8e05e9006d12a
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f146c02d45c - std::sys_common::backtrace::_print_fmt::h40fa413ec9439832
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/sys_common/backtrace.rs:68:5
3: 0x7f146c02d45c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h5055b8322c3eecd3
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f146c080510 - core::fmt::rt::Argument::fmt::h142c2cad35d6896a
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/core/src/fmt/rt.rs:142:9
5: 0x7f146c080510 - core::fmt::write::hd72f8a00b68449f5
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/core/src/fmt/mod.rs:1120:17
6: 0x7f146c0212bf - std::io::Write::write_fmt::h1bcd670a0cd9a7ff
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/io/mod.rs:1810:15
7: 0x7f146c02d244 - std::sys_common::backtrace::_print::h579af4e2f431a26b
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/sys_common/backtrace.rs:47:5
8: 0x7f146c02d244 - std::sys_common::backtrace::print::hdb76c2f48b3f9ac2
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/sys_common/backtrace.rs:34:9
9: 0x7f146c02ff47 - std::panicking::default_hook::{{closure}}::hb2313c1cb20e0e8d
10: 0x7f146c02fcaf - std::panicking::default_hook::h0c0e9cb7313537d7
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/panicking.rs:292:9
11: 0x7f1468d3f330 - std[90fcdab509e9b154]::panicking::update_hook::<alloc[197ac5e7db877155]::boxed::Box<rustc_driver_impl[c59161498cce3c44]::install_ice_hook::{closure#0}>>::{closure#0}
12: 0x7f146c030688 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h0f5771c93d1f75ce
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/alloc/src/boxed.rs:2029:9
13: 0x7f146c030688 - std::panicking::rust_panic_with_hook::h4edda63d730d17fc
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/panicking.rs:783:13
14: 0x7f1468d773b4 - std[90fcdab509e9b154]::panicking::begin_panic::<rustc_errors[b8d39b1188f581a8]::ExplicitBug>::{closure#0}
15: 0x7f1468d73846 - std[90fcdab509e9b154]::sys_common::backtrace::__rust_end_short_backtrace::<std[90fcdab509e9b154]::panicking::begin_panic<rustc_errors[b8d39b1188f581a8]::ExplicitBug>::{closure#0}, !>
16: 0x7f1468d6eea6 - std[90fcdab509e9b154]::panicking::begin_panic::<rustc_errors[b8d39b1188f581a8]::ExplicitBug>
17: 0x7f1468d82558 - <rustc_errors[b8d39b1188f581a8]::diagnostic_builder::Bug as rustc_errors[b8d39b1188f581a8]::diagnostic_builder::EmissionGuarantee>::diagnostic_builder_emit_producing_guarantee
18: 0x7f1469163a15 - <rustc_errors[b8d39b1188f581a8]::Handler>::bug::<alloc[197ac5e7db877155]::string::String>
19: 0x7f14691fe5fd - rustc_middle[17eaf787359ec706]::util::bug::opt_span_bug_fmt::<rustc_span[9c405c0df40bde1a]::span_encoding::Span>::{closure#0}
20: 0x7f14691e7f0a - rustc_middle[17eaf787359ec706]::ty::context::tls::with_opt::<rustc_middle[17eaf787359ec706]::util::bug::opt_span_bug_fmt<rustc_span[9c405c0df40bde1a]::span_encoding::Span>::{closure#0}, !>::{closure#0}
21: 0x7f14691e7d88 - rustc_middle[17eaf787359ec706]::ty::context::tls::with_context_opt::<rustc_middle[17eaf787359ec706]::ty::context::tls::with_opt<rustc_middle[17eaf787359ec706]::util::bug::opt_span_bug_fmt<rustc_span[9c405c0df40bde1a]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
22: 0x7f146715b670 - rustc_middle[17eaf787359ec706]::util::bug::bug_fmt
23: 0x7f146a3b9f90 - rustc_trait_selection[2323e8e34cf002d2]::traits::specialize::translate_args_with_cause::<rustc_trait_selection[2323e8e34cf002d2]::traits::specialize::translate_args::{closure#0}>
24: 0x7f146a2a9347 - rustc_trait_selection[2323e8e34cf002d2]::traits::project::opt_normalize_projection_type
25: 0x7f146a2a5f9e - <rustc_trait_selection[2323e8e34cf002d2]::traits::project::AssocTypeNormalizer as rustc_type_ir[f2235eff04baa55d]::fold::TypeFolder<rustc_middle[17eaf787359ec706]::ty::context::TyCtxt>>::fold_ty
26: 0x7f146a95b95c - rustc_trait_selection[2323e8e34cf002d2]::traits::project::normalize_with_depth_to::<rustc_middle[17eaf787359ec706]::ty::ImplHeader>::{closure#0}
27: 0x7f146a95ae43 - rustc_trait_selection[2323e8e34cf002d2]::traits::coherence::fresh_impl_header_normalized
28: 0x7f146a959108 - rustc_trait_selection[2323e8e34cf002d2]::traits::coherence::overlap
29: 0x7f146a76e9f3 - <rustc_middle[17eaf787359ec706]::traits::specialization_graph::Children as rustc_trait_selection[2323e8e34cf002d2]::traits::specialize::specialization_graph::ChildrenExt>::insert
30: 0x7f146a76e07b - <rustc_middle[17eaf787359ec706]::traits::specialization_graph::Graph as rustc_trait_selection[2323e8e34cf002d2]::traits::specialize::specialization_graph::GraphExt>::insert
31: 0x7f146aaa6d8a - rustc_trait_selection[2323e8e34cf002d2]::traits::specialize::specialization_graph_provider
32: 0x7f146aaa67b2 - rustc_query_impl[43baca739a647e2b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[43baca739a647e2b]::query_impl::specialization_graph_of::dynamic_query::{closure#2}::{closure#0}, rustc_middle[17eaf787359ec706]::query::erase::Erased<[u8; 8usize]>>
33: 0x7f146a0811d4 - rustc_query_system[f7d04bba5a359203]::query::plumbing::try_execute_query::<rustc_query_impl[43baca739a647e2b]::DynamicConfig<rustc_query_system[f7d04bba5a359203]::query::caches::DefaultCache<rustc_span[9c405c0df40bde1a]::def_id::DefId, rustc_middle[17eaf787359ec706]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[43baca739a647e2b]::plumbing::QueryCtxt, false>
34: 0x7f146a4220de - rustc_query_impl[43baca739a647e2b]::query_impl::specialization_graph_of::get_query_non_incr::__rust_end_short_backtrace
35: 0x7f146a1ec291 - rustc_hir_analysis[521878d46db95bb1]::coherence::coherent_trait
36: 0x7f146a1ec16f - rustc_query_impl[43baca739a647e2b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[43baca739a647e2b]::query_impl::coherent_trait::dynamic_query::{closure#2}::{closure#0}, rustc_middle[17eaf787359ec706]::query::erase::Erased<[u8; 0usize]>>
37: 0x7f146a9832fd - rustc_query_system[f7d04bba5a359203]::query::plumbing::try_execute_query::<rustc_query_impl[43baca739a647e2b]::DynamicConfig<rustc_query_system[f7d04bba5a359203]::query::caches::DefaultCache<rustc_span[9c405c0df40bde1a]::def_id::DefId, rustc_middle[17eaf787359ec706]::query::erase::Erased<[u8; 0usize]>>, false, false, false>, rustc_query_impl[43baca739a647e2b]::plumbing::QueryCtxt, false>
38: 0x7f146a98308d - rustc_query_impl[43baca739a647e2b]::query_impl::coherent_trait::get_query_non_incr::__rust_end_short_backtrace
39: 0x7f146a96e7aa - rustc_hir_analysis[521878d46db95bb1]::check_crate
40: 0x7f146aab0117 - rustc_interface[1819133c53e350af]::passes::analysis
41: 0x7f146aaafd5d - rustc_query_impl[43baca739a647e2b]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[43baca739a647e2b]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[17eaf787359ec706]::query::erase::Erased<[u8; 1usize]>>
42: 0x7f146afa9ff2 - rustc_query_system[f7d04bba5a359203]::query::plumbing::try_execute_query::<rustc_query_impl[43baca739a647e2b]::DynamicConfig<rustc_query_system[f7d04bba5a359203]::query::caches::SingleCache<rustc_middle[17eaf787359ec706]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[43baca739a647e2b]::plumbing::QueryCtxt, false>
43: 0x7f146afa9df9 - rustc_query_impl[43baca739a647e2b]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
44: 0x7f146b045e97 - rustc_interface[1819133c53e350af]::interface::run_compiler::<core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>, rustc_driver_impl[c59161498cce3c44]::run_compiler::{closure#0}>::{closure#0}
45: 0x7f146afbceda - std[90fcdab509e9b154]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[1819133c53e350af]::util::run_in_thread_with_globals<rustc_interface[1819133c53e350af]::util::run_in_thread_pool_with_globals<rustc_interface[1819133c53e350af]::interface::run_compiler<core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>, rustc_driver_impl[c59161498cce3c44]::run_compiler::{closure#0}>::{closure#0}, core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>>::{closure#0}, core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>>
46: 0x7f146afbcd03 - <<std[90fcdab509e9b154]::thread::Builder>::spawn_unchecked_<rustc_interface[1819133c53e350af]::util::run_in_thread_with_globals<rustc_interface[1819133c53e350af]::util::run_in_thread_pool_with_globals<rustc_interface[1819133c53e350af]::interface::run_compiler<core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>, rustc_driver_impl[c59161498cce3c44]::run_compiler::{closure#0}>::{closure#0}, core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>>::{closure#0}, core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ea5c17b9bf3f7e3c]::result::Result<(), rustc_span[9c405c0df40bde1a]::ErrorGuaranteed>>::{closure#1} as core[ea5c17b9bf3f7e3c]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
47: 0x7f146c03a515 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9895702b6be34956
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/alloc/src/boxed.rs:2015:9
48: 0x7f146c03a515 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hbd2c76ba009df5db
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/alloc/src/boxed.rs:2015:9
49: 0x7f146c03a515 - std::sys::unix::thread::Thread::new::thread_start::h8bdfca0a04fd1f70
at /rustc/d253bf61ad38a59cc579aee688f81a06c31283d3/library/std/src/sys/unix/thread.rs:108:17
50: 0x7f1465eaa9eb - <unknown>
51: 0x7f1465f2e7cc - <unknown>
52: 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 1.76.0-nightly (d253bf61a 2023-12-15) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [specialization_graph_of] building specialization graph of trait `Foo`
#1 [coherent_trait] coherence checking all impls of trait `Foo`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 2 previous errors; 1 warning emitted
For more information about this error, try `rustc --explain E0601`.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Metadata
Assignees
Labels
Area: Trait impl specializationArea: Trait impl specializationCategory: This is a bug.Category: This is a bug.`#![feature(specialization)]``#![feature(specialization)]`Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Status: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.Relevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.