Closed
Description
Code
#![feature(non_lifetime_binders)]
//check-pass
trait Yokeable<'a>: 'static {
type Output: 'a;
}
trait IsCovariant<'a> {}
struct Yoke<Y: for<'a> Yokeable<'a>> {
data: Y,
}
impl<Y: for<'a> Yokeable<'a>> Yoke<Y> {
fn project<Y2: for<'a> Yokeable<'a>>(&self, _f: for<'a> fn(<unimplemented as Yokeable<'a>>::Output, &'a ())
-> <Y2 as Yokeable<'a>>::Output) -> Yoke<Y2> {
Y!()
}
}
fn Output<Y>(x: Yoke<Y>) -> Yoke<Box<dyn IsCovariant<'static> + 'static>> where
Y: for<'a> Yokeable<'a>,
for<Y> <Y as Yokeable<'a>>::Output: IsCovariant<'a>
{
x.project(|data, _| {
Box::new(data)
})
}
fn main() {}Meta
rustc --version --verbose:
rustc 1.69.0-nightly (f4f5fc3e5 2023-02-17)
binary: rustc
commit-hash: f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3
commit-date: 2023-02-17
host: x86_64-unknown-linux-gnu
release: 1.69.0-nightly
LLVM version: 15.0.7
Error output
error: cannot find macro `Y` in this scope
--> c6f5bb10cb6b78062f94af3d8fe00a0d821f0cf8.rs:19:9
|
19 | Y!()
| ^
error[E0261]: use of undeclared lifetime name `'a`
--> c6f5bb10cb6b78062f94af3d8fe00a0d821f0cf8.rs:25:27
|
25 | for<Y> <Y as Yokeable<'a>>::Output: IsCovariant<'a>
| ^^ undeclared lifetime
|
= note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
help: consider making the bound lifetime-generic with a new `'a` lifetime
|
25 | for<'a, Y> <Y as Yokeable<'a>>::Output: IsCovariant<'a>
| +++
help: consider introducing lifetime `'a` here
|
23 | fn Output<'a, Y>(x: Yoke<Y>) -> Yoke<Box<dyn IsCovariant<'static> + 'static>> where
| +++
error[E0261]: use of undeclared lifetime name `'a`
--> c6f5bb10cb6b78062f94af3d8fe00a0d821f0cf8.rs:25:53
|
25 | for<Y> <Y as Yokeable<'a>>::Output: IsCovariant<'a>
| ^^ undeclared lifetime
|
help: consider making the bound lifetime-generic with a new `'a` lifetime
|
25 | for<Y> <Y as Yokeable<'a>>::Output: for<'a> IsCovariant<'a>
| +++++++
help: consider making the bound lifetime-generic with a new `'a` lifetime
|
25 | for<'a, Y> <Y as Yokeable<'a>>::Output: IsCovariant<'a>
| +++
help: consider introducing lifetime `'a` here
|
23 | fn Output<'a, Y>(x: Yoke<Y>) -> Yoke<Box<dyn IsCovariant<'static> + 'static>> where
| +++
error[E0573]: expected type, found macro `unimplemented`
--> c6f5bb10cb6b78062f94af3d8fe00a0d821f0cf8.rs:16:65
|
16 | fn project<Y2: for<'a> Yokeable<'a>>(&self, _f: for<'a> fn(<unimplemented as Yokeable<'a>>::Output, &'a ())
| ^^^^^^^^^^^^^ not a type
warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes
--> c6f5bb10cb6b78062f94af3d8fe00a0d821f0cf8.rs:1:12
|
1 | #![feature(non_lifetime_binders)]
| ^^^^^^^^^^^^^^^^^^^^
|
= note: see issue #1 <https://github.com/rust-lang/rust/issues/1> for more information
= note: `#[warn(incomplete_features)]` on by default
Backtrace
thread 'rustc' panicked at 'assertion failed: self.canonicalize_mode.preserve_universes()', compiler/rustc_infer/src/infer/canonical/canonicalizer.rs:592:13
stack backtrace:
0: 0x7f42d1b6aa5a - std::backtrace_rs::backtrace::libunwind::trace::hebe09041f884c65d
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7f42d1b6aa5a - std::backtrace_rs::backtrace::trace_unsynchronized::h546f6c63cbbce5a9
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f42d1b6aa5a - std::sys_common::backtrace::_print_fmt::h2559cb0cfed7a617
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/sys_common/backtrace.rs:65:5
3: 0x7f42d1b6aa5a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1fb4eaaaafa2d72a
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/sys_common/backtrace.rs:44:22
4: 0x7f42d1bca9ae - core::fmt::write::hbaef4432b3c9d07b
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/core/src/fmt/mod.rs:1232:17
5: 0x7f42d1b5ae05 - std::io::Write::write_fmt::h1f8dce362441faaa
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/io/mod.rs:1684:15
6: 0x7f42d1b6a825 - std::sys_common::backtrace::_print::hc0e92ab849a4f4e1
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/sys_common/backtrace.rs:47:5
7: 0x7f42d1b6a825 - std::sys_common::backtrace::print::h878cd11684ebdec3
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/sys_common/backtrace.rs:34:9
8: 0x7f42d1b6d59f - std::panicking::default_hook::{{closure}}::h2ea8a6875aa6312d
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/panicking.rs:267:22
9: 0x7f42d1b6d2db - std::panicking::default_hook::h9e42277a84072188
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/panicking.rs:286:9
10: 0x7f42d4e6e7b4 - <rustc_driver_impl[afa3c304d692170b]::DEFAULT_HOOK::{closure#0}::{closure#0} as core[ebab21900c9c0a2]::ops::function::FnOnce<(&core[ebab21900c9c0a2]::panic::panic_info::PanicInfo,)>>::call_once::{shim:vtable#0}
11: 0x7f42d1b6dddd - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h2c34f129ed413128
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/alloc/src/boxed.rs:2002:9
12: 0x7f42d1b6dddd - std::panicking::rust_panic_with_hook::h4c799b8c4fc0a70b
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/panicking.rs:692:13
13: 0x7f42d1b6db12 - std::panicking::begin_panic_handler::{{closure}}::h91f35d20f5c22591
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/panicking.rs:577:13
14: 0x7f42d1b6aec6 - std::sys_common::backtrace::__rust_end_short_backtrace::hcc464c7f8476de7c
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/sys_common/backtrace.rs:137:18
15: 0x7f42d1b6d862 - rust_begin_unwind
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/panicking.rs:575:5
16: 0x7f42d1bc7353 - core::panicking::panic_fmt::hea21d570c6a5058a
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/core/src/panicking.rs:64:14
17: 0x7f42d1bc73ed - core::panicking::panic::h9f0e8fa76b84eb00
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/core/src/panicking.rs:114:5
18: 0x7f42d2ead480 - <rustc_infer[92cb48f58201d890]::infer::canonical::canonicalizer::Canonicalizer>::canonical_var
19: 0x7f42d5164938 - <rustc_infer[92cb48f58201d890]::infer::canonical::canonicalizer::Canonicalizer>::canonicalize_ty_var
20: 0x7f42d2ea78cc - <rustc_infer[92cb48f58201d890]::infer::canonical::canonicalizer::Canonicalizer as rustc_type_ir[b1287c9e7106c79]::fold::TypeFolder<rustc_middle[6caff671bb338453]::ty::context::TyCtxt>>::fold_ty
21: 0x7f42d3070e1c - <rustc_infer[92cb48f58201d890]::infer::canonical::canonicalizer::Canonicalizer as rustc_type_ir[b1287c9e7106c79]::fold::FallibleTypeFolder<rustc_middle[6caff671bb338453]::ty::context::TyCtxt>>::try_fold_predicate
22: 0x7f42d4474977 - <rustc_infer[92cb48f58201d890]::infer::canonical::canonicalizer::Canonicalizer>::canonicalize::<rustc_middle[6caff671bb338453]::ty::ParamEnvAnd<rustc_middle[6caff671bb338453]::ty::Predicate>>
23: 0x7f42d447429f - <rustc_infer[92cb48f58201d890]::infer::InferCtxt as rustc_trait_selection[b19fab792c1f9feb]::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation_no_overflow
24: 0x7f42d5ba0728 - <rustc_infer[92cb48f58201d890]::infer::InferCtxt>::probe::<bool, <rustc_infer[92cb48f58201d890]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[b19fab792c1f9feb]::traits::error_reporting::InferCtxtPrivExt>::predicate_can_apply::{closure#0}>
25: 0x7f42d5ad821a - <rustc_infer[92cb48f58201d890]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[b19fab792c1f9feb]::traits::error_reporting::TypeErrCtxtExt>::report_selection_error
26: 0x7f42d5adf534 - <rustc_infer[92cb48f58201d890]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[b19fab792c1f9feb]::traits::error_reporting::InferCtxtPrivExt>::report_fulfillment_error
27: 0x7f42d5ad37e1 - <rustc_infer[92cb48f58201d890]::infer::error_reporting::TypeErrCtxt as rustc_trait_selection[b19fab792c1f9feb]::traits::error_reporting::TypeErrCtxtExt>::report_fulfillment_errors
28: 0x7f42d33b59f8 - rustc_trait_selection[b19fab792c1f9feb]::traits::do_normalize_predicates
29: 0x7f42d33ab024 - rustc_trait_selection[b19fab792c1f9feb]::traits::normalize_param_env_or_error
30: 0x7f42d33a901f - rustc_ty_utils[d54f27f879906d58]::ty::param_env
31: 0x7f42d33a712f - rustc_query_system[5ff89444bbfc32f5]::query::plumbing::get_query::<rustc_query_impl[ef929ccf3c28623b]::queries::param_env, rustc_query_impl[ef929ccf3c28623b]::plumbing::QueryCtxt, rustc_middle[6caff671bb338453]::dep_graph::dep_node::DepKind>
32: 0x7f42d39206b5 - rustc_hir_analysis[257f64c795d1d076]::check::wfcheck::check_item_fn
33: 0x7f42d391bbc1 - rustc_hir_analysis[257f64c795d1d076]::check::wfcheck::check_well_formed
34: 0x7f42d356d1e5 - rustc_query_system[5ff89444bbfc32f5]::query::plumbing::get_query::<rustc_query_impl[ef929ccf3c28623b]::queries::check_well_formed, rustc_query_impl[ef929ccf3c28623b]::plumbing::QueryCtxt, rustc_middle[6caff671bb338453]::dep_graph::dep_node::DepKind>
35: 0x7f42d4181fc6 - rustc_data_structures[cd995ba5556f5758]::sync::par_for_each_in::<&[rustc_hir[f4a2ff38696703b5]::hir::ItemId], <rustc_middle[6caff671bb338453]::hir::ModuleItems>::par_items<rustc_hir_analysis[257f64c795d1d076]::check::wfcheck::check_mod_type_wf::{closure#0}>::{closure#0}>
36: 0x7f42d4181b70 - rustc_hir_analysis[257f64c795d1d076]::check::wfcheck::check_mod_type_wf
37: 0x7f42d442b0bf - rustc_query_system[5ff89444bbfc32f5]::query::plumbing::try_execute_query::<rustc_query_impl[ef929ccf3c28623b]::queries::check_mod_type_wf, rustc_query_impl[ef929ccf3c28623b]::plumbing::QueryCtxt>
38: 0x7f42d442ac9d - <rustc_query_impl[ef929ccf3c28623b]::Queries as rustc_middle[6caff671bb338453]::ty::query::QueryEngine>::check_mod_type_wf
39: 0x7f42d40788a4 - std[dc63ca99f82ce43d]::panicking::try::<(), core[ebab21900c9c0a2]::panic::unwind_safe::AssertUnwindSafe<rustc_data_structures[cd995ba5556f5758]::sync::par_for_each_in<&[rustc_hir[f4a2ff38696703b5]::hir_id::OwnerId], <rustc_middle[6caff671bb338453]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[257f64c795d1d076]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>::{closure#0}::{closure#0}>>
40: 0x7f42d33134b8 - rustc_data_structures[cd995ba5556f5758]::sync::par_for_each_in::<&[rustc_hir[f4a2ff38696703b5]::hir_id::OwnerId], <rustc_middle[6caff671bb338453]::hir::map::Map>::par_for_each_module<rustc_hir_analysis[257f64c795d1d076]::check_crate::{closure#5}::{closure#0}::{closure#0}>::{closure#0}>
41: 0x7f42d3313340 - <rustc_session[66793dd6b8780a4a]::session::Session>::track_errors::<rustc_hir_analysis[257f64c795d1d076]::check_crate::{closure#5}, ()>
42: 0x7f42d3310618 - rustc_hir_analysis[257f64c795d1d076]::check_crate
43: 0x7f42d3306062 - rustc_interface[686dab9608bc6033]::passes::analysis
44: 0x7f42d4663d92 - rustc_query_system[5ff89444bbfc32f5]::query::plumbing::try_execute_query::<rustc_query_impl[ef929ccf3c28623b]::queries::analysis, rustc_query_impl[ef929ccf3c28623b]::plumbing::QueryCtxt>
45: 0x7f42d4867e2a - <rustc_query_impl[ef929ccf3c28623b]::Queries as rustc_middle[6caff671bb338453]::ty::query::QueryEngine>::analysis
46: 0x7f42d4080303 - <rustc_interface[686dab9608bc6033]::queries::QueryResult<&rustc_middle[6caff671bb338453]::ty::context::GlobalCtxt>>::enter::<core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>, rustc_driver_impl[afa3c304d692170b]::run_compiler::{closure#1}::{closure#2}::{closure#3}>
47: 0x7f42d407f4d4 - <rustc_interface[686dab9608bc6033]::interface::Compiler>::enter::<rustc_driver_impl[afa3c304d692170b]::run_compiler::{closure#1}::{closure#2}, core[ebab21900c9c0a2]::result::Result<core[ebab21900c9c0a2]::option::Option<rustc_interface[686dab9608bc6033]::queries::Linker>, rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>>
48: 0x7f42d407a6f4 - rustc_span[1010a352e5466fad]::with_source_map::<core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>, rustc_interface[686dab9608bc6033]::interface::run_compiler<core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>, rustc_driver_impl[afa3c304d692170b]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
49: 0x7f42d407a204 - <scoped_tls[d487b98c36b0d138]::ScopedKey<rustc_span[1010a352e5466fad]::SessionGlobals>>::set::<rustc_interface[686dab9608bc6033]::interface::run_compiler<core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>, rustc_driver_impl[afa3c304d692170b]::run_compiler::{closure#1}>::{closure#0}, core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>>
50: 0x7f42d4079902 - std[dc63ca99f82ce43d]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[686dab9608bc6033]::util::run_in_thread_pool_with_globals<rustc_interface[686dab9608bc6033]::interface::run_compiler<core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>, rustc_driver_impl[afa3c304d692170b]::run_compiler::{closure#1}>::{closure#0}, core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>>
51: 0x7f42d40796ac - <<std[dc63ca99f82ce43d]::thread::Builder>::spawn_unchecked_<rustc_interface[686dab9608bc6033]::util::run_in_thread_pool_with_globals<rustc_interface[686dab9608bc6033]::interface::run_compiler<core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>, rustc_driver_impl[afa3c304d692170b]::run_compiler::{closure#1}>::{closure#0}, core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[ebab21900c9c0a2]::result::Result<(), rustc_errors[faa449d960b5ce55]::ErrorGuaranteed>>::{closure#1} as core[ebab21900c9c0a2]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
52: 0x7f42d1b77c63 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9fd36c4a0ba5b15d
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/alloc/src/boxed.rs:1988:9
53: 0x7f42d1b77c63 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hd37d267854c7434f
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/alloc/src/boxed.rs:1988:9
54: 0x7f42d1b77c63 - std::sys::unix::thread::Thread::new::thread_start::h1ff24d5a09f2a8be
at /rustc/f4f5fc3e5cc70b7a43bf7b518c455f3d9bada9e3/library/std/src/sys/unix/thread.rs:108:17
55: 0x7f42d18d0bb5 - <unknown>
56: 0x7f42d1952d90 - <unknown>
57: 0x0 - <unknown>
error: the compiler unexpectedly panicked. this is a bug.
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 1.69.0-nightly (f4f5fc3e5 2023-02-17) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [param_env] computing normalized predicates of `Output`
#1 [check_well_formed] checking that `Output` is well-formed
#2 [check_mod_type_wf] checking that types are well-formed in top-level module
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 4 previous errors; 1 warning emitted
Some errors have detailed explanations: E0261, E0573.
For more information about an error, try `rustc --explain E0261`.