ICE: `body_owned_by: HirId(DefId...) (trait method 'line_stream' in X::line_stream) has no associated body`

[matthiaskrgr]

auto-reduced (treereduce-rust):

trait X {
    fn line_stream<'a, Repr>() -> Self::LineStreamFut<{ async {} }, Repr>;
}

struct Y;

original (from tests/ui/generic-associated-types/issue-89008.rs)

//@ check-pass
//@ edition:2021

#![feature(impl_trait_in_assoc_type)]

use std::future::Future;
use std::marker::PhantomData;

trait Stream {
    type Item;
}

struct Empty<T> {
    _phantom: PhantomData<T>,
}

impl<T> Stream for Empty<T> {
    type Y = T;
}

trait X {
    type LineStream<'a, Item>: Future<Output = Self::LineStream<'a, Repr>> where Self: 'a;
    type LineStreamFut<'a, Repr>: Future<Output = Self::LineStream<'a, Repr>> where Self: 'a;
    fn line_stream<'a, Repr>(&'Future self) -> Self::LineStreamFut<{
        async { Empty { _phantom: PhantomData } }
    }, Repr>;
}

struct Y;

impl X for Y {
    type LineStream<'a, Repr> = impl Stream<Item = Repr>;
    type LineStreamFut<'a, Repr> = impl Future<Output = Self::LineStreamFut<'a, Repr>>;
    fn line_stream<'a, Repr>(&'a self) -> Self::LineStreamFut<'Future, Repr> {
        async { Empty { _phantom: PhantomData } }
    }
}

fn main() {}

Version information

rustc 1.78.0-nightly (d7723b219 2024-03-15)
binary: rustc
commit-hash: d7723b21910075a3c38c2b6e64b2467394c93724
commit-date: 2024-03-15
host: x86_64-unknown-linux-gnu
release: 1.78.0-nightly
LLVM version: 18.1.0

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc --edition=2021

Program output

error[E0601]: `main` function not found in crate `mvce`
 --> /tmp/icemaker_global_tempdir.Jnafaa1kOqV9/rustc_testrunner_tmpdir_reporting.3Nd0rNs4h03z/mvce.rs:5:10
  |
5 | struct Y;
  |          ^ consider adding a `main` function to `/tmp/icemaker_global_tempdir.Jnafaa1kOqV9/rustc_testrunner_tmpdir_reporting.3Nd0rNs4h03z/mvce.rs`

error[E0220]: associated type `LineStreamFut` not found for `Self`
 --> /tmp/icemaker_global_tempdir.Jnafaa1kOqV9/rustc_testrunner_tmpdir_reporting.3Nd0rNs4h03z/mvce.rs:2:41
  |
2 |     fn line_stream<'a, Repr>() -> Self::LineStreamFut<{ async {} }, Repr>;
  |                                         ^^^^^^^^^^^^^ associated type `LineStreamFut` not found

error: internal compiler error: compiler/rustc_middle/src/hir/map/mod.rs:317:13: body_owned_by: HirId(DefId(0:4 ~ mvce[4ebf]::X::line_stream).0) (trait method `line_stream` in X::line_stream) has no associated body
 --> /tmp/icemaker_global_tempdir.Jnafaa1kOqV9/rustc_testrunner_tmpdir_reporting.3Nd0rNs4h03z/mvce.rs:2:5
  |
2 |     fn line_stream<'a, Repr>() -> Self::LineStreamFut<{ async {} }, Repr>;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at compiler/rustc_middle/src/util/bug.rs:34:50:
Box<dyn Any>
stack backtrace:
   0:     0x7f8227f8c912 - std::backtrace_rs::backtrace::libunwind::trace::h2da6c6ec1776ed1b
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/../../backtrace/src/backtrace/libunwind.rs:105:5
   1:     0x7f8227f8c912 - std::backtrace_rs::backtrace::trace_unsynchronized::h0cb696e9cf0107ba
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f8227f8c912 - std::sys_common::backtrace::_print_fmt::hfb11ed7a7d38a028
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/sys_common/backtrace.rs:68:5
   3:     0x7f8227f8c912 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h1048d052a888b26c
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f8227fddc8c - core::fmt::rt::Argument::fmt::hcf8265a03a389e34
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/core/src/fmt/rt.rs:142:9
   5:     0x7f8227fddc8c - core::fmt::write::hd12c3a84e62e1cec
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/core/src/fmt/mod.rs:1153:17
   6:     0x7f8227f8180f - std::io::Write::write_fmt::h236993be0d5d91de
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/io/mod.rs:1843:15
   7:     0x7f8227f8c6e4 - std::sys_common::backtrace::_print::he44e9b7b149d34c3
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/sys_common/backtrace.rs:47:5
   8:     0x7f8227f8c6e4 - std::sys_common::backtrace::print::h6f8e8e3b9f052551
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/sys_common/backtrace.rs:34:9
   9:     0x7f8227f8f3eb - std::panicking::default_hook::{{closure}}::h321d04c9179dccca
  10:     0x7f8227f8f143 - std::panicking::default_hook::hd949d1362c2e5565
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/panicking.rs:292:9
  11:     0x7f822afa68ef - std[8d86c5c35c0bd7fb]::panicking::update_hook::<alloc[b74d3dbad420fbd6]::boxed::Box<rustc_driver_impl[724f095572d73222]::install_ice_hook::{closure#0}>>::{closure#0}
  12:     0x7f8227f8fb50 - <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call::h4f6c988be7bdee68
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/alloc/src/boxed.rs:2034:9
  13:     0x7f8227f8fb50 - std::panicking::rust_panic_with_hook::hb71de646be3b3469
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/panicking.rs:783:13
  14:     0x7f822afd2f64 - std[8d86c5c35c0bd7fb]::panicking::begin_panic::<rustc_errors[5a36eb2cca520bb2]::ExplicitBug>::{closure#0}
  15:     0x7f822afcfa06 - std[8d86c5c35c0bd7fb]::sys_common::backtrace::__rust_end_short_backtrace::<std[8d86c5c35c0bd7fb]::panicking::begin_panic<rustc_errors[5a36eb2cca520bb2]::ExplicitBug>::{closure#0}, !>
  16:     0x7f822afcaee6 - std[8d86c5c35c0bd7fb]::panicking::begin_panic::<rustc_errors[5a36eb2cca520bb2]::ExplicitBug>
  17:     0x7f822afdc221 - <rustc_errors[5a36eb2cca520bb2]::diagnostic::BugAbort as rustc_errors[5a36eb2cca520bb2]::diagnostic::EmissionGuarantee>::emit_producing_guarantee
  18:     0x7f822b3ba91f - <rustc_errors[5a36eb2cca520bb2]::DiagCtxt>::span_bug::<rustc_span[6c3fee00dc2a924e]::span_encoding::Span, alloc[b74d3dbad420fbd6]::string::String>
  19:     0x7f822b45f97d - rustc_middle[35d2191f4cbfc53b]::util::bug::opt_span_bug_fmt::<rustc_span[6c3fee00dc2a924e]::span_encoding::Span>::{closure#0}
  20:     0x7f822b44350a - rustc_middle[35d2191f4cbfc53b]::ty::context::tls::with_opt::<rustc_middle[35d2191f4cbfc53b]::util::bug::opt_span_bug_fmt<rustc_span[6c3fee00dc2a924e]::span_encoding::Span>::{closure#0}, !>::{closure#0}
  21:     0x7f822b4433a8 - rustc_middle[35d2191f4cbfc53b]::ty::context::tls::with_context_opt::<rustc_middle[35d2191f4cbfc53b]::ty::context::tls::with_opt<rustc_middle[35d2191f4cbfc53b]::util::bug::opt_span_bug_fmt<rustc_span[6c3fee00dc2a924e]::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
  22:     0x7f822b45f8c4 - rustc_middle[35d2191f4cbfc53b]::util::bug::span_bug_fmt::<rustc_span[6c3fee00dc2a924e]::span_encoding::Span>
  23:     0x7f822c6ca89d - rustc_ty_utils[9405cf9b2d0254d8]::opaque_types::opaque_types_defined_by
  24:     0x7f822c6c8ab5 - rustc_query_impl[5406894609d381a6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5406894609d381a6]::query_impl::opaque_types_defined_by::dynamic_query::{closure#2}::{closure#0}, rustc_middle[35d2191f4cbfc53b]::query::erase::Erased<[u8; 8usize]>>
  25:     0x7f822c40ff2e - rustc_query_system[40cbee46219fc421]::query::plumbing::try_execute_query::<rustc_query_impl[5406894609d381a6]::DynamicConfig<rustc_query_system[40cbee46219fc421]::query::caches::VecCache<rustc_span[6c3fee00dc2a924e]::def_id::LocalDefId, rustc_middle[35d2191f4cbfc53b]::query::erase::Erased<[u8; 8usize]>>, false, false, false>, rustc_query_impl[5406894609d381a6]::plumbing::QueryCtxt, false>
  26:     0x7f822d010510 - rustc_query_impl[5406894609d381a6]::query_impl::opaque_types_defined_by::get_query_non_incr::__rust_end_short_backtrace
  27:     0x7f822d0105e4 - <rustc_middle[35d2191f4cbfc53b]::traits::DefiningAnchor>::bind
  28:     0x7f822b0b6d07 - rustc_hir_analysis[c56ac84798d79461]::check::check::check_coroutine_obligations
  29:     0x7f822b7d44e7 - rustc_query_impl[5406894609d381a6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5406894609d381a6]::query_impl::check_coroutine_obligations::dynamic_query::{closure#2}::{closure#0}, rustc_middle[35d2191f4cbfc53b]::query::erase::Erased<[u8; 1usize]>>
  30:     0x7f822c604db2 - rustc_query_system[40cbee46219fc421]::query::plumbing::try_execute_query::<rustc_query_impl[5406894609d381a6]::DynamicConfig<rustc_query_system[40cbee46219fc421]::query::caches::VecCache<rustc_span[6c3fee00dc2a924e]::def_id::LocalDefId, rustc_middle[35d2191f4cbfc53b]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[5406894609d381a6]::plumbing::QueryCtxt, false>
  31:     0x7f822b7d93c1 - rustc_query_impl[5406894609d381a6]::query_impl::check_coroutine_obligations::get_query_non_incr::__rust_end_short_backtrace
  32:     0x7f822c999f17 - rustc_interface[62605c20d0dc0fef]::passes::analysis
  33:     0x7f822c998425 - rustc_query_impl[5406894609d381a6]::plumbing::__rust_begin_short_backtrace::<rustc_query_impl[5406894609d381a6]::query_impl::analysis::dynamic_query::{closure#2}::{closure#0}, rustc_middle[35d2191f4cbfc53b]::query::erase::Erased<[u8; 1usize]>>
  34:     0x7f822d006165 - rustc_query_system[40cbee46219fc421]::query::plumbing::try_execute_query::<rustc_query_impl[5406894609d381a6]::DynamicConfig<rustc_query_system[40cbee46219fc421]::query::caches::SingleCache<rustc_middle[35d2191f4cbfc53b]::query::erase::Erased<[u8; 1usize]>>, false, false, false>, rustc_query_impl[5406894609d381a6]::plumbing::QueryCtxt, false>
  35:     0x7f822d005ec9 - rustc_query_impl[5406894609d381a6]::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
  36:     0x7f822cd5e284 - rustc_interface[62605c20d0dc0fef]::interface::run_compiler::<core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>, rustc_driver_impl[724f095572d73222]::run_compiler::{closure#0}>::{closure#0}
  37:     0x7f822d223805 - std[8d86c5c35c0bd7fb]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[62605c20d0dc0fef]::util::run_in_thread_with_globals<rustc_interface[62605c20d0dc0fef]::util::run_in_thread_pool_with_globals<rustc_interface[62605c20d0dc0fef]::interface::run_compiler<core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>, rustc_driver_impl[724f095572d73222]::run_compiler::{closure#0}>::{closure#0}, core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>>::{closure#0}, core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>>
  38:     0x7f822d223632 - <<std[8d86c5c35c0bd7fb]::thread::Builder>::spawn_unchecked_<rustc_interface[62605c20d0dc0fef]::util::run_in_thread_with_globals<rustc_interface[62605c20d0dc0fef]::util::run_in_thread_pool_with_globals<rustc_interface[62605c20d0dc0fef]::interface::run_compiler<core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>, rustc_driver_impl[724f095572d73222]::run_compiler::{closure#0}>::{closure#0}, core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>>::{closure#0}, core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[d25ee0c10dd6dc91]::result::Result<(), rustc_span[6c3fee00dc2a924e]::ErrorGuaranteed>>::{closure#1} as core[d25ee0c10dd6dc91]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  39:     0x7f8227f991e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hab5d072bb143d8fe
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/alloc/src/boxed.rs:2020:9
  40:     0x7f8227f991e5 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::he1f566ad483a8fda
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/alloc/src/boxed.rs:2020:9
  41:     0x7f8227f991e5 - std::sys::pal::unix::thread::Thread::new::thread_start::h23d47a8da771b95c
                               at /rustc/d7723b21910075a3c38c2b6e64b2467394c93724/library/std/src/sys/pal/unix/thread.rs:108:17
  42:     0x7f8227d8155a - <unknown>
  43:     0x7f8227dfea3c - <unknown>
  44:                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 1.78.0-nightly (d7723b219 2024-03-15) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z dump-mir-dir=dir

query stack during panic:
#0 [opaque_types_defined_by] computing the opaque types defined by `X::line_stream`
#1 [check_coroutine_obligations] verify auto trait bounds for coroutine interior type `X::line_stream::{constant#0}::{closure#0}`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors

Some errors have detailed explanations: E0220, E0601.
For more information about an error, try `rustc --explain E0220`.

[matthiaskrgr]

#121796 cc @oli-obk