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ICE: coercion error but no error emitted / mismatched types / broken MIR #112208

Closed
matthiaskrgr opened this issue Jun 2, 2023 · 3 comments · Fixed by #112215
Closed

ICE: coercion error but no error emitted / mismatched types / broken MIR #112208

matthiaskrgr opened this issue Jun 2, 2023 · 3 comments · Fixed by #112215
Labels
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.

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@matthiaskrgr
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Code

#![crate_type = "lib"]
pub trait TestTrait {
    type MyType;
    fn func() -> Option<Self>
    where
        Self: Sized;
}

impl<T> dyn TestTrait<MyType = T>
where
    Self: Sized,
{
    fn other_func() -> TestTrait<MyType = T> {
        match Self::func() {
            None => None,
        }
    }
}

Meta

rustc --version --verbose:

rustc 1.72.0-nightly (d59363ad0 2023-06-01)
binary: rustc
commit-hash: d59363ad0b6391b7fc5bbb02c9ccf9300eef3753
commit-date: 2023-06-01
host: x86_64-unknown-linux-gnu
release: 1.72.0-nightly
LLVM version: 16.0.4

Error output

warning: trait objects without an explicit `dyn` are deprecated
  --> treereduce.out:13:24
   |
13 |     fn other_func() -> TestTrait<MyType = T> {
   |                        ^^^^^^^^^^^^^^^^^^^^^
   |
   = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
   = note: `#[warn(bare_trait_objects)]` on by default
help: use `dyn`
   |
13 |     fn other_func() -> dyn TestTrait<MyType = T> {
   |                        +++

warning: associated function `other_func` is never used
  --> treereduce.out:13:8
   |
9  | impl<T> dyn TestTrait<MyType = T>
   | --------------------------------- associated function in this implementation
...
13 |     fn other_func() -> TestTrait<MyType = T> {
   |        ^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default
Backtrace 

error: internal compiler error: no errors encountered even though `delay_span_bug` issued

error: internal compiler error: coercion error but no error emitted
  --> treereduce.out:15:21
   |
15 |             None => None,
   |                     ^^^^
   |
   = note: delayed at compiler/rustc_hir_typeck/src/coercion.rs:1554:34
              0: <rustc_errors::HandlerInner>::emit_diagnostic
              1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &str>
              2: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_match::{closure#0}
              3: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
              4: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
              5: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
              6: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_return_expr
              7: rustc_hir_typeck::check::check_fn
              8: rustc_hir_typeck::typeck
              9: 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]>>
             10: <rustc_query_impl::query_impl::typeck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
             11: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             12: rustc_query_impl::query_impl::typeck::get_query_non_incr::__rust_end_short_backtrace
             13: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::used_trait_imports::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
             14: <rustc_query_impl::query_impl::used_trait_imports::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
             15: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             16: rustc_query_impl::query_impl::used_trait_imports::get_query_non_incr::__rust_end_short_backtrace
             17: rustc_hir_analysis::check_crate
             18: rustc_interface::passes::analysis
             19: 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; 1]>>
             20: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
             21: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             22: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
             23: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             24: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             25: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             26: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             27: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
             28: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             29: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             30: std::sys::unix::thread::Thread::new::thread_start
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/std/src/sys/unix/thread.rs:108:17
             31: <unknown>
             32: <unknown>


error: internal compiler error[E0308]: mismatched types
  --> treereduce.out:15:21
   |
13 |     fn other_func() -> TestTrait<MyType = T> {
   |                        --------------------- expected `(dyn TestTrait<MyType = T> + 'static)` because of return type
14 |         match Self::func() {
15 |             None => None,
   |                     ^^^^ expected `dyn TestTrait`, found `Option<_>`
   |
   = note: expected trait object `(dyn TestTrait<MyType = T> + 'static)`
                      found enum `Option<_>`
   = note: delayed at compiler/rustc_infer/src/infer/error_reporting/mod.rs:2084:38
              0: <rustc_errors::HandlerInner>::emit_diagnostic
              1: <rustc_errors::Handler>::emit_diagnostic
              2: <rustc_span::ErrorGuaranteed as rustc_errors::diagnostic_builder::EmissionGuarantee>::diagnostic_builder_emit_producing_guarantee
              3: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_match::{closure#0}
              4: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
              5: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_block_with_expected
              6: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_expr_with_expectation_and_args
              7: <rustc_hir_typeck::fn_ctxt::FnCtxt>::check_return_expr
              8: rustc_hir_typeck::check::check_fn
              9: rustc_hir_typeck::typeck
             10: 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]>>
             11: <rustc_query_impl::query_impl::typeck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
             12: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, 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_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::used_trait_imports::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
             15: <rustc_query_impl::query_impl::used_trait_imports::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
             16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             17: rustc_query_impl::query_impl::used_trait_imports::get_query_non_incr::__rust_end_short_backtrace
             18: rustc_hir_analysis::check_crate
             19: rustc_interface::passes::analysis
             20: 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; 1]>>
             21: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
             22: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             23: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
             24: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             25: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             26: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             27: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             28: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
             29: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             30: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             31: std::sys::unix::thread::Thread::new::thread_start
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/std/src/sys/unix/thread.rs:108:17
             32: <unknown>
             33: <unknown>


error: internal compiler error: broken MIR in DefId(0:8 ~ treereduce[882d]::{impl#0}::other_func) ("return type"): bad type {type error}
  --> treereduce.out:13:5
   |
13 |     fn other_func() -> TestTrait<MyType = T> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:505:13
              0: <rustc_errors::HandlerInner>::emit_diagnostic
              1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
              2: <rustc_borrowck::type_check::TypeVerifier as rustc_middle::mir::visit::Visitor>::visit_body
              3: rustc_borrowck::type_check::type_check
              4: rustc_borrowck::nll::compute_regions
              5: rustc_borrowck::do_mir_borrowck
              6: rustc_borrowck::mir_borrowck
              7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
              8: <rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
              9: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             10: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
             11: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>
             12: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#1}>
             13: rustc_interface::passes::analysis
             14: 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; 1]>>
             15: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
             16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             17: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
             18: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             19: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             20: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             21: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             22: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
             23: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             24: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             25: std::sys::unix::thread::Thread::new::thread_start
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/std/src/sys/unix/thread.rs:108:17
             26: <unknown>
             27: <unknown>


error: internal compiler error: TyKind::Error constructed but no error reported
  |
  = note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:755:20
             0: <rustc_errors::HandlerInner>::emit_diagnostic
             1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, &str>
             2: <rustc_middle::ty::context::TyCtxt>::ty_error_misc
             3: <rustc_borrowck::type_check::TypeVerifier as rustc_middle::mir::visit::Visitor>::visit_body
             4: rustc_borrowck::type_check::type_check
             5: rustc_borrowck::nll::compute_regions
             6: rustc_borrowck::do_mir_borrowck
             7: rustc_borrowck::mir_borrowck
             8: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
             9: <rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
            10: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            11: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
            12: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>
            13: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#1}>
            14: rustc_interface::passes::analysis
            15: 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; 1]>>
            16: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
            17: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
            18: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
            19: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            20: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
            21: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            22: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
            23: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
            24: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
            25: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                       at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
            26: std::sys::unix::thread::Thread::new::thread_start
                       at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/std/src/sys/unix/thread.rs:108:17
            27: <unknown>
            28: <unknown>


error: internal compiler error: broken MIR in DefId(0:8 ~ treereduce[882d]::{impl#0}::other_func) (LocalDecl { mutability: Mut, local_info: Set(Boring), internal: false, ty: {type error}, user_ty: None, source_info: SourceInfo { span: treereduce.out:13:5: 13:45 (#0), scope: scope[0] } }): bad type {type error}
  --> treereduce.out:13:5
   |
13 |     fn other_func() -> TestTrait<MyType = T> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: delayed at compiler/rustc_borrowck/src/type_check/mod.rs:505:13
              0: <rustc_errors::HandlerInner>::emit_diagnostic
              1: <rustc_errors::Handler>::delay_span_bug::<rustc_span::span_encoding::Span, alloc::string::String>
              2: <rustc_borrowck::type_check::TypeVerifier as rustc_middle::mir::visit::Visitor>::visit_body
              3: rustc_borrowck::type_check::type_check
              4: rustc_borrowck::nll::compute_regions
              5: rustc_borrowck::do_mir_borrowck
              6: rustc_borrowck::mir_borrowck
              7: rustc_query_impl::plumbing::__rust_begin_short_backtrace::<rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2}::{closure#0}, rustc_middle::query::erase::Erased<[u8; 8]>>
              8: <rustc_query_impl::query_impl::mir_borrowck::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, rustc_span::def_id::LocalDefId)>>::call_once
              9: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::VecCache<rustc_span::def_id::LocalDefId, rustc_middle::query::erase::Erased<[u8; 8]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             10: rustc_query_impl::query_impl::mir_borrowck::get_query_non_incr::__rust_end_short_backtrace
             11: rustc_data_structures::sync::par_for_each_in::<&[rustc_span::def_id::LocalDefId], <rustc_middle::hir::map::Map>::par_body_owners<rustc_interface::passes::analysis::{closure#1}::{closure#0}>::{closure#0}>
             12: <rustc_session::session::Session>::time::<(), rustc_interface::passes::analysis::{closure#1}>
             13: rustc_interface::passes::analysis
             14: 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; 1]>>
             15: <rustc_query_impl::query_impl::analysis::dynamic_query::{closure#2} as core::ops::function::FnOnce<(rustc_middle::ty::context::TyCtxt, ())>>::call_once
             16: rustc_query_system::query::plumbing::try_execute_query::<rustc_query_impl::DynamicConfig<rustc_query_system::query::caches::SingleCache<rustc_middle::query::erase::Erased<[u8; 1]>>, false, false, false>, rustc_query_impl::plumbing::QueryCtxt, false>
             17: rustc_query_impl::query_impl::analysis::get_query_non_incr::__rust_end_short_backtrace
             18: <rustc_middle::ty::context::GlobalCtxt>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}::{closure#4}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             19: <rustc_interface::interface::Compiler>::enter::<rustc_driver_impl::run_compiler::{closure#1}::{closure#2}, core::result::Result<core::option::Option<rustc_interface::queries::Linker>, rustc_span::ErrorGuaranteed>>
             20: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             21: std::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>
             22: <<std::thread::Builder>::spawn_unchecked_<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<core::result::Result<(), rustc_span::ErrorGuaranteed>, rustc_driver_impl::run_compiler::{closure#1}>::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#0}::{closure#0}, core::result::Result<(), rustc_span::ErrorGuaranteed>>::{closure#1} as core::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
             23: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             24: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/alloc/src/boxed.rs:1985:9
             25: std::sys::unix::thread::Thread::new::thread_start
                        at /rustc/d59363ad0b6391b7fc5bbb02c9ccf9300eef3753/library/std/src/sys/unix/thread.rs:108:17
             26: <unknown>
             27: <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 1.72.0-nightly (d59363ad0 2023-06-01) running on x86_64-unknown-linux-gnu

query stack during panic:
end of query stack
error: aborting due to 6 previous errors; 2 warnings emitted

For more information about this error, try `rustc --explain E0308`.

@matthiaskrgr matthiaskrgr added 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. C-bug Category: This is a bug. labels Jun 2, 2023
@matthiaskrgr
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bisected to #111704 cc @compiler-errors

@compiler-errors
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This can be made to ICE on stable as well:

pub trait TestTrait<T> {}

impl<T> dyn TestTrait<T>
where
    Self: Sized,
{
    fn other_func() -> dyn TestTrait<T> {
        None::<()>
    }
}

fn main() {}

@lukas-code
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duplicate of #110683

@compiler-errors compiler-errors mentioned this issue Jun 2, 2023
Merged
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Jun 3, 2023
@matthiaskrgr
Rollup merge of rust-lang#112215 - compiler-errors:check-sized-better…
a6e3036 
…, r=cjgillot

only suppress coercion error if type is definitely unsized

we previously suppressed coercion errors when the return type was `dyn Trait` because we expect a far more descriptive `Sized` trait error to be emitted instead, however the code that does this suppression does not consider where-clause predicates since it just looked at the HIR. let's do that instead by creating an obligation and checking if it may hold.

fixes rust-lang#110683
fixes rust-lang#112208
@bors bors closed this as completed in 20cbbbb Jun 3, 2023
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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.
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only suppress coercion error if type is definitely unsized compiler-errors/rust
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@matthiaskrgr @compiler-errors @lukas-code