ICE (OutputTypeParameterMismatch) with type_alias_impl_trait #72793

SNCPlay42 · 2020-05-30T19:32:55Z

Code

Here's MCVE: #72793 (comment) (Edited by JohnTitor)

#![feature(type_alias_impl_trait)]

type FilteredIter<'a> = impl Iterator<Item = &'a i32> + 'a;

fn filter_positive<'a>(vals: &'a [i32]) -> FilteredIter<'a> {
    vals.iter().filter(|x| **x >= 0)
}

fn with_positive<F>(vals: &[i32], fun: F)
where
    F: Fn(FilteredIter<'_>),
{
    fun(filter_positive(vals));
}

fn main() {
    let x = vec![-1, 1, -2, 2, -3, 3];

    with_positive(&x, |iter| {
        iter.for_each(|x| println!("{}", x));
    });
}

Playground

Error output

error: internal compiler error: src/librustc_trait_selection/traits/codegen/mod.rs:62: Encountered error `OutputTypeParameterMismatch(Binder(<[closure@src/main.rs:19:23: 21:6] as std::ops::Fn<(FilteredIter::<'_>,)>>), Binder(<[closure@src/main.rs:19:23: 21:6] as std::ops::Fn<(std::iter::Filter<std::slice::Iter<i32>, [closure@src/main.rs:6:24: 6:36]>,)>>), Sorts(ExpectedFound { expected: std::iter::Filter<std::slice::Iter<i32>, [closure@src/main.rs:6:24: 6:36]>, found: FilteredIter::<'_> }))` selecting `Binder(<[closure@src/main.rs:19:23: 21:6] as std::ops::Fn<(std::iter::Filter<std::slice::Iter<i32>, [closure@src/main.rs:6:24: 6:36]>,)>>)` during codegen

Prettied a bit:

error: internal compiler error: 
src/librustc_trait_selection/traits/codegen/mod.rs:62: 
Encountered error
`OutputTypeParameterMismatch(
	Binder(<[closure@src/main.rs:19:23: 21:6] as std::ops::Fn<(FilteredIter::<'_>,)>>),
	Binder(<[closure@src/main.rs:19:23: 21:6] as std::ops::Fn<(std::iter::Filter<std::slice::Iter<i32>, [closure@src/main.rs:6:24: 6:36]>,)>>),
	Sorts(ExpectedFound {
		expected: std::iter::Filter<std::slice::Iter<i32>, [closure@src/main.rs:6:24: 6:36]>,
		found: FilteredIter::<'_>
	})
)`
selecting `Binder(<[closure@src/main.rs:19:23: 21:6] as std::ops::Fn<(std::iter::Filter<std::slice::Iter<i32>, [closure@src/main.rs:6:24: 6:36]>,)>>)`
during codegen

Backtrace

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:907:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/gitpro.ttaallkk.top-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/gitpro.ttaallkk.top-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1076
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1537
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:198
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:218
  10: rustc_driver::report_ice
  11: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:490
  12: std::panicking::begin_panic
  13: rustc_errors::HandlerInner::bug
  14: rustc_errors::Handler::bug
  15: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
  16: rustc_middle::ty::context::tls::with_opt::{{closure}}
  17: rustc_middle::ty::context::tls::with_opt
  18: rustc_middle::util::bug::opt_span_bug_fmt
  19: rustc_middle::util::bug::bug_fmt
  20: rustc_middle::ty::context::tls::with_context::{{closure}}
  21: rustc_trait_selection::traits::codegen::codegen_fulfill_obligation
  22: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::codegen_fulfill_obligation>::compute
  23: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  24: rustc_data_structures::stack::ensure_sufficient_stack
  25: rustc_query_system::query::plumbing::get_query_impl
  26: rustc_ty::instance::resolve_instance
  27: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::resolve_instance>::compute
  28: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  29: rustc_data_structures::stack::ensure_sufficient_stack
  30: rustc_query_system::query::plumbing::get_query_impl
  31: rustc_middle::ty::instance::Instance::resolve
  32: <rustc_mir::monomorphize::collector::MirNeighborCollector as rustc_middle::mir::visit::Visitor>::visit_terminator_kind
  33: rustc_mir::monomorphize::collector::collect_neighbours
  34: rustc_data_structures::stack::ensure_sufficient_stack
  35: rustc_mir::monomorphize::collector::collect_items_rec
  36: rustc_mir::monomorphize::collector::collect_items_rec
  37: rustc_mir::monomorphize::collector::collect_crate_mono_items
  38: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  39: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_and_partition_mono_items>::compute
  40: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  41: rustc_data_structures::stack::ensure_sufficient_stack
  42: rustc_query_system::query::plumbing::get_query_impl
  43: rustc_codegen_ssa::base::codegen_crate
  44: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  45: rustc_interface::passes::start_codegen
  46: rustc_middle::ty::context::tls::enter_global
  47: rustc_interface::queries::Queries::ongoing_codegen
  48: rustc_interface::interface::run_compiler_in_existing_thread_pool
  49: rustc_ast::attr::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.45.0-nightly (4bd32c980 2020-05-29) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [codegen_fulfill_obligation] checking if `std::ops::Fn` fulfills its obligations
#1 [resolve_instance] resolving instance `<[closure@src/main.rs:19:23: 21:6] as std::ops::Fn<(std::iter::Filter<std::slice::Iter<i32>, [closure@src/main.rs:6:24: 6:36]>,)>>::call`
#2 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack

The text was updated successfully, but these errors were encountered:

Patryk27 · 2020-05-30T19:39:39Z

Just for reference - works fine with explicit lifetimes:

fn with_positive<'a, F>(vals: &'a [i32], fun: F)
where
    F: Fn(FilteredIter<'a>),
{
    fun(filter_positive(vals));
}

SNCPlay42 · 2020-05-30T19:40:27Z

@rustbot modify labels: +requires-nightly +F-type_alias_impl_trait

hellow554 · 2020-06-01T18:56:25Z

Smaller:

#![feature(type_alias_impl_trait)]

trait T { type Item; }

type Alias<'a> = impl T<Item = &'a ()>;

struct S;
impl<'a> T for &'a S {
    type Item = &'a ();
}

fn filter_positive<'a>() -> Alias<'a> {
    &S
}

fn with_positive(fun: impl Fn(Alias<'_>)) {
    fun(filter_positive());
}

fn main() {
    with_positive(|_| ());
}

JohnTitor · 2020-08-14T12:25:58Z

Seems this is fixed in the latest nightly (not bisected yet). Marking as E-needs-test and will try to bisect later.

matthiaskrgr · 2020-08-14T15:46:56Z

Still crashes with -Zmir-opt-level=2

error: internal compiler error: Encountered error `Unimplemented` selecting `Binder(<impl Fn(Alias<'_>) as std::ops::Fn<(impl T,)>>)` during codegen
  |
  = note: delayed at /home/matthias/vcs/github/rust/src/librustc_session/session.rs:441:27

thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/lib.rs:366:17
stack backtrace:
   0:     0x7f6662e2ae31 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9a65342185cb7022
   1:     0x7f6662e999dd - core::fmt::write::hc3de054a6627b208
   2:     0x7f6662e0ab53 - std::io::Write::write_fmt::h64bd8d8dca95fd5c
   3:     0x7f6662e03bb0 - std::panicking::default_hook::{{closure}}::ha9c6947a872dc513
   4:     0x7f6662e037ed - std::panicking::default_hook::h3e5e46d076456208
   5:     0x7f6663ef0269 - rustc_driver::report_ice::he0572c9ff71e0a8c
   6:     0x7f6662e041f6 - std::panicking::rust_panic_with_hook::h30c558028146672c
   7:     0x7f6666991a56 - std::panicking::begin_panic::{{closure}}::h62cde3015c32ea83
   8:     0x7f666699191e - std::sys_common::backtrace::__rust_end_short_backtrace::h8d34e3f6f4e20c59
   9:     0x7f666696859c - std::panicking::begin_panic::h6e7f1f8f159dddb1
  10:     0x7f6666971dae - <rustc_errors::HandlerInner as core::ops::drop::Drop>::drop::h5013360fb564f32c
  11:     0x7f6663d4a3d6 - core::ptr::drop_in_place::h4e9bf5d5a9a1b0b3
  12:     0x7f6663d6dad0 - <alloc::rc::Rc<T> as core::ops::drop::Drop>::drop::h0ba476d8189f3dd5
  13:     0x7f6663ec6a4d - core::ptr::drop_in_place::hb83cdb4088f009cf
  14:     0x7f6663eacc92 - rustc_span::with_source_map::hdfa547cd4d1341a2
  15:     0x7f6663d24038 - rustc_interface::interface::create_compiler_and_run::h10b475d531695c0e
  16:     0x7f6663eb7bfd - std::sys_common::backtrace::__rust_begin_short_backtrace::h4c9162f49c0dc935
  17:     0x7f6663eba9be - core::ops::function::FnOnce::call_once{{vtable.shim}}::hbba71a1842b71242
  18:     0x7f6662e05cda - std::sys::unix::thread::Thread::new::thread_start::hdc96d124dc384f80
  19:     0x7f665fc04422 - start_thread
  20:     0x7f6662c07bf3 - __clone
  21:                0x0 - <unknown>

error: internal compiler error: unexpected panic

note: 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 1.47.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: -Z mir-opt-level=2

query stack during panic:
end of query stack

JohnTitor · 2020-08-14T15:54:59Z

Ohh, good catch! Still, the regression test here is useful but let's keep this open then :)

Oops, closed by mistake XD

JohnTitor · 2020-08-19T08:05:30Z

Bisected, it's fixed by #75443.

Add a regression test for issue-72793 Adds a regression test for rust-lang#72793, which is fixed by rust-lang#75443. Note that this won't close the issue as the snippet still shows ICE with `-Zmir-opt-level=2`. But it makes sense to add a test anyway.

revert rust-lang#75443, update mir validator This PR reverts rust-lang#75443 to fix rust-lang#75992 and instead uses rust-lang#75419 to fix rust-lang#75313. Adapts rust-lang#75419 to correctly deal with unevaluated constants as otherwise some `feature(const_evaluatable_checked)` tests would ICE. Note that rust-lang#72793 was also fixed by rust-lang#75443, but as that issue only concerns `feature(type_alias_impl_trait)` I deleted that test case for now and would reopen that issue. rust-lang#75443 may have also allowed some other code to now successfully compile which would make this revert a breaking change after 2 stable versions, but I hope that this is a purely theoretical concern. See https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/generator.20upvars/near/214617274 for more reasoning about this. r? `@nikomatsakis` `@eddyb` `@RalfJung`

matthiaskrgr · 2020-11-08T17:16:22Z

This ICEs again now:

error: internal compiler error: compiler/rustc_trait_selection/src/traits/codegen.rs:78:17: Encountered error `OutputTypeParameterMismatch(Binder(<[closure@./72793.rs:21:19: 21:25] as std::ops::Fn<(impl T,)>>), Binder(<[closure@./72793.rs:21:19: 21:25] as std::ops::Fn<(&S,)>>), Sorts(ExpectedFound { expected: &S, found: impl T }))` selecting `Binder(<[closure@./72793.rs:21:19: 21:25] as std::ops::Fn<(&S,)>>)` during codegen

thread 'rustc' panicked at 'Box<Any>', compiler/rustc_errors/src/lib.rs:958:9
stack backtrace:
   0:     0x7f714147aa50 - std::backtrace_rs::backtrace::libunwind::trace::h448c56741b6011d3
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/../../backtrace/src/backtrace/libunwind.rs:100:5
   1:     0x7f714147aa50 - std::backtrace_rs::backtrace::trace_unsynchronized::h2d26397c5720fdbb
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f714147aa50 - std::sys_common::backtrace::_print_fmt::h720a2f61f75b9f58
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f714147aa50 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h8d62bbfda6d5c836
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7f71414ea94c - core::fmt::write::h1857a60b204f1b6a
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/core/src/fmt/mod.rs:1078:17
   5:     0x7f714146c6b2 - std::io::Write::write_fmt::h16a9fe7680ac245c
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/io/mod.rs:1518:15
   6:     0x7f714147fa05 - std::sys_common::backtrace::_print::h9ba51a6db618de7d
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7f714147fa05 - std::sys_common::backtrace::print::h5f20e41c85e91716
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7f714147fa05 - std::panicking::default_hook::{{closure}}::h5b7294ca19e8edab
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/panicking.rs:208:50
   9:     0x7f714147f6a8 - std::panicking::default_hook::hb3948d1f74b6ff4c
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/panicking.rs:227:9
  10:     0x7f7141d5a2d4 - rustc_driver::report_ice::h021ea70c3b174afa
  11:     0x7f7141480306 - std::panicking::rust_panic_with_hook::h55d23fef0ad751bc
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/panicking.rs:597:17
  12:     0x7f7144da3f7d - std::panicking::begin_panic::{{closure}}::h2d2fd75c8f2a2341
  13:     0x7f7144da3de6 - std::sys_common::backtrace::__rust_end_short_backtrace::h463d6160b8d38e51
  14:     0x7f7144da3f1f - std::panicking::begin_panic::h7716ff6593f9c4fe
  15:     0x7f7144ddcc9c - rustc_errors::HandlerInner::bug::hcaaf59cd7aedcc3b
  16:     0x7f7144ddb290 - rustc_errors::Handler::bug::h709d540b8038ac8d
  17:     0x7f71448b1324 - rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}::hd783d6169452aa9a
  18:     0x7f71448b05db - rustc_middle::ty::context::tls::with_opt::{{closure}}::hb843c547a56f3e04
  19:     0x7f71448b0582 - rustc_middle::ty::context::tls::with_opt::h3f9cf1292158aa7f
  20:     0x7f71448b1249 - rustc_middle::util::bug::opt_span_bug_fmt::hbec46092491724ec
  21:     0x7f71448b11be - rustc_middle::util::bug::bug_fmt::hd9854762eb11f3b1
  22:     0x7f71440d0667 - rustc_infer::infer::InferCtxtBuilder::enter::hd27c91343128654f
  23:     0x7f71442fb38f - rustc_trait_selection::traits::codegen::codegen_fulfill_obligation::hbb8f1b498b15c1ea
  24:     0x7f7142351a2b - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::codegen_fulfill_obligation>::compute::h1cd7b59c9a9732c0
  25:     0x7f7142340028 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h6569c8e990e04dd1
  26:     0x7f7142369ed6 - rustc_data_structures::stack::ensure_sufficient_stack::h4d0f969f57d162bc
  27:     0x7f71422f677c - rustc_query_system::query::plumbing::get_query_impl::h225377355e8b4967
  28:     0x7f714235a448 - rustc_ty::instance::inner_resolve_instance::hcd318f1ced437469
  29:     0x7f714235a0aa - rustc_ty::instance::resolve_instance::h3bc1bc12db816545
  30:     0x7f7144c4102a - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::resolve_instance>::compute::he88c4b2daaf352f7
  31:     0x7f7144c703f0 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h66ffbab719a699ee
  32:     0x7f71448518c6 - rustc_data_structures::stack::ensure_sufficient_stack::h5d70dde26801a158
  33:     0x7f71445b46bb - rustc_query_system::query::plumbing::get_query_impl::h0f9977ba7047dd61
  34:     0x7f7144c322c4 - rustc_middle::ty::instance::Instance::resolve_opt_const_arg::he0415d3539e95d51
  35:     0x7f7144c31f80 - rustc_middle::ty::instance::Instance::resolve::h7b74795a5a17f452
  36:     0x7f7143340c3f - <rustc_mir::monomorphize::collector::MirNeighborCollector as rustc_middle::mir::visit::Visitor>::visit_terminator::hecf45b8e4c8ef86f
  37:     0x7f71433438cf - rustc_mir::monomorphize::collector::collect_neighbours::h007bc9dac1822f58
  38:     0x7f714333e192 - rustc_mir::monomorphize::collector::collect_items_rec::h8b80aa1d8c5baccb
  39:     0x7f714333e404 - rustc_mir::monomorphize::collector::collect_items_rec::h8b80aa1d8c5baccb
  40:     0x7f7143607841 - rustc_session::utils::<impl rustc_session::session::Session>::time::h0769395397f4e773
  41:     0x7f714333d10d - rustc_mir::monomorphize::collector::collect_crate_mono_items::h16fd359bc82e9cba
  42:     0x7f71433f727c - rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items::hd62bc8ab380467e4
  43:     0x7f714217ebc2 - rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::collect_and_partition_mono_items>::compute::ha94f6ecf95919685
  44:     0x7f71420f00c9 - rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl::h11581c1c2273af7b
  45:     0x7f714215a25a - rustc_data_structures::stack::ensure_sufficient_stack::h5cc442ccbebc74cd
  46:     0x7f714204da4b - rustc_query_system::query::plumbing::get_query_impl::h4e7fa7005ff50500
  47:     0x7f714217f9cc - rustc_codegen_ssa::base::codegen_crate::h90cf2d1d07dcdf6e
  48:     0x7f71421d6a15 - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h2a59653aff37ec7b
  49:     0x7f7141f94e3f - rustc_interface::passes::QueryContext::enter::hae4ed674370a9e23
  50:     0x7f7141fc52d3 - rustc_interface::queries::Queries::ongoing_codegen::h54d5e3fae50fcc04
  51:     0x7f7141d6ee51 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::hefaa7b63637d8d8e
  52:     0x7f7141d5ce7e - rustc_span::with_source_map::h829c6eccedcb37ca
  53:     0x7f7141d70252 - rustc_interface::interface::create_compiler_and_run::h5c2da4096753e17e
  54:     0x7f7141d5da5a - rustc_span::with_session_globals::h3b2e3a8e7e59ecdc
  55:     0x7f7141d75be1 - std::sys_common::backtrace::__rust_begin_short_backtrace::hf69e25d23954f1a0
  56:     0x7f7141cdcc18 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hed3ab0291d940426
  57:     0x7f714148f30a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h9e7afb7a0a438236
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/alloc/src/boxed.rs:1307:9
  58:     0x7f714148f30a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h70c646c4271337a1
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/alloc/src/boxed.rs:1307:9
  59:     0x7f714148f30a - std::sys::unix::thread::Thread::new::thread_start::h35d2b8d36f210d02
                               at /rustc/b1277d04db0dc8009037e872a1be7cdc2bd74a43/library/std/src/sys/unix/thread.rs:89:17
  60:     0x7f714138a3e9 - start_thread
  61:     0x7f71412a7293 - __GI___clone
  62:                0x0 - <unknown>

note: 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 1.49.0-nightly (b1277d04d 2020-11-08) running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [codegen_fulfill_obligation] checking if `std::ops::Fn` fulfills its obligations
#1 [resolve_instance] resolving instance `<[closure@./72793.rs:21:19: 21:25] as std::ops::Fn<(&S,)>>::call`
#2 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: aborting due to previous error

JohnTitor · 2020-12-04T20:29:03Z

Because of #78410, dropped E-needs-test.

jackh726 · 2021-06-29T21:14:52Z

cc #85499 which probably fixes this

oli-obk · 2022-05-03T08:15:15Z

Seems to be fixed again

add test for 72793 Fixes rust-lang#72793 r? `@oli-obk`

add test for 72793 Fixes rust-lang#72793 r? ``@oli-obk``

add test for 72793 Fixes rust-lang#72793 r? ```@oli-obk```

add test for 72793 Fixes rust-lang#72793 r? ````@oli-obk````

SNCPlay42 added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 30, 2020

rustbot added F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` requires-nightly This issue requires a nightly compiler in some way. labels May 30, 2020

rust-lang-glacier-bot added the glacier ICE tracked in rust-lang/glacier. label Jun 2, 2020

github-actions bot mentioned this issue Aug 14, 2020

ices/72793.rs: fixed with no errors rust-lang/glacier#458

Merged

JohnTitor added the E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. label Aug 14, 2020

JohnTitor closed this as completed Aug 14, 2020

JohnTitor reopened this Aug 14, 2020

JohnTitor mentioned this issue Aug 19, 2020

Add a regression test for issue-72793 #75695

Merged

This was referenced Oct 26, 2020

revert #75443, update mir validator lcnr/rust#2

Closed

revert #75443, update mir validator #78410

Merged

JohnTitor removed the E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. label Dec 4, 2020

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rustbot added the E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. label Mar 16, 2021

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JohnTitor removed the E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. label Mar 16, 2021

matthiaskrgr mentioned this issue Mar 17, 2021

ices/74280.rs: fixed with errors rust-lang/glacier#688

Closed

jackh726 added the F-min_type_alias_impl_trait label Jun 29, 2021

oli-obk removed the F-min_type_alias_impl_trait label Mar 30, 2022

matthiaskrgr added the E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. label Jun 29, 2022

matthiaskrgr mentioned this issue Jun 29, 2022

add test for 72793 #98684

Merged

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this issue Jun 30, 2022

Rollup merge of rust-lang#98684 - matthiaskrgr:ice-test-72793, r=oli-obk

82f5bb9

add test for 72793 Fixes rust-lang#72793 r? `@oli-obk`

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Jun 30, 2022

Rollup merge of rust-lang#98684 - matthiaskrgr:ice-test-72793, r=oli-obk

b1ee5c7

add test for 72793 Fixes rust-lang#72793 r? ``@oli-obk``

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Jun 30, 2022

Rollup merge of rust-lang#98684 - matthiaskrgr:ice-test-72793, r=oli-obk

62d37a4

add test for 72793 Fixes rust-lang#72793 r? ```@oli-obk```

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Jun 30, 2022

Rollup merge of rust-lang#98684 - matthiaskrgr:ice-test-72793, r=oli-obk

7839890

add test for 72793 Fixes rust-lang#72793 r? ````@oli-obk````

bors closed this as completed in afd8cf2 Jul 1, 2022

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ICE (OutputTypeParameterMismatch) with type_alias_impl_trait #72793

ICE (OutputTypeParameterMismatch) with type_alias_impl_trait #72793

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ICE (OutputTypeParameterMismatch) with type_alias_impl_trait #72793

ICE (OutputTypeParameterMismatch) with type_alias_impl_trait #72793

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