ICE: called `Option::unwrap()` on a `None` value in collector.rs:934:13

[EqualMa]

Code

pub trait MyFnOnce {
    type Output;

    fn call_my_fn_once(self) -> Self::Output;
}

pub struct WrapFnOnce<F>(F);

impl<F: FnOnce() -> D, D: MyFnOnce> MyFnOnce for WrapFnOnce<F> {
    type Output = D::Output;

    fn call_my_fn_once(self) -> Self::Output {
        D::call_my_fn_once(self.0())
    }
}

impl<F: FnOnce() -> D, D: MyFnOnce> MyFnOnce for F {
    type Output = D::Output;

    fn call_my_fn_once(self) -> Self::Output {
        D::call_my_fn_once(self())
    }
}

pub fn my_fn_1() -> impl MyFnOnce {
    my_fn_2
}

pub fn my_fn_2() -> impl MyFnOnce {
    WrapFnOnce(my_fn_1)
}

fn main() {
    let v = my_fn_1();

    let _ = v.call_my_fn_once();
}

Meta

rustc --version --verbose:

rustc 1.67.0-nightly (7632db0e8 2022-12-08)
binary: rustc
commit-hash: 7632db0e87d8adccc9a83a47795c9411b1455855
commit-date: 2022-12-08
host: x86_64-unknown-linux-gnu
release: 1.67.0-nightly
LLVM version: 15.0.6

Error output

thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_monomorphize/src/collector.rs:934:13

Backtrace

   Compiling playground v0.0.1 (/playground)
thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_monomorphize/src/collector.rs:934:13
stack backtrace:
   0:     0x7f3aa13546fa - std::backtrace_rs::backtrace::libunwind::trace::hd10eda5ab6cb4cdc
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f3aa13546fa - std::backtrace_rs::backtrace::trace_unsynchronized::hc2d933a1d87136b7
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3aa13546fa - std::sys_common::backtrace::_print_fmt::hbc6e39d05cece0e1
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/sys_common/backtrace.rs:65:5
   3:     0x7f3aa13546fa - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h4e096cc08b8f7ff2
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/sys_common/backtrace.rs:44:22
   4:     0x7f3aa13b725e - core::fmt::write::hc749f618e420865d
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/core/src/fmt/mod.rs:1208:17
   5:     0x7f3aa1344b85 - std::io::Write::write_fmt::hcc30ae83ad852555
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/io/mod.rs:1682:15
   6:     0x7f3aa13544c5 - std::sys_common::backtrace::_print::h959485d45136857a
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/sys_common/backtrace.rs:47:5
   7:     0x7f3aa13544c5 - std::sys_common::backtrace::print::h0230b8f1225098e1
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/sys_common/backtrace.rs:34:9
   8:     0x7f3aa135720f - std::panicking::default_hook::{{closure}}::h8a33a3e829ffa1d9
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/panicking.rs:267:22
   9:     0x7f3aa1356f4b - std::panicking::default_hook::hf47ea80dd34c42c2
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/panicking.rs:286:9
  10:     0x7f3aa1357a2c - std::panicking::rust_panic_with_hook::h35768f1f6cd02ad1
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/panicking.rs:688:13
  11:     0x7f3aa1357782 - std::panicking::begin_panic_handler::{{closure}}::h170be62b62ce816d
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/panicking.rs:577:13
  12:     0x7f3aa1354bac - std::sys_common::backtrace::__rust_end_short_backtrace::h4da703bbf123f25f
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/sys_common/backtrace.rs:137:18
  13:     0x7f3aa13574d2 - rust_begin_unwind
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/panicking.rs:575:5
  14:     0x7f3aa13b3c43 - core::panicking::panic_fmt::hd20232bc69d718fb
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/core/src/panicking.rs:64:14
  15:     0x7f3aa13b3d1d - core::panicking::panic::h2f5d8547ea5d8675
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/core/src/panicking.rs:111:5
  16:     0x7f3aa2f77181 - rustc_monomorphize[ac07385237987836]::collector::collect_neighbours
  17:     0x7f3aa2f6bcf3 - rustc_monomorphize[ac07385237987836]::collector::collect_items_rec
  18:     0x7f3aa393618b - <rustc_session[fff9c52cf8bf58c5]::session::Session>::time::<(), rustc_monomorphize[ac07385237987836]::collector::collect_crate_mono_items::{closure#1}>
  19:     0x7f3aa3935cc4 - rustc_monomorphize[ac07385237987836]::collector::collect_crate_mono_items
  20:     0x7f3aa3934eb2 - rustc_monomorphize[ac07385237987836]::partitioning::collect_and_partition_mono_items
  21:     0x7f3aa3df1d60 - rustc_query_system[ddabab1eafb597f0]::query::plumbing::try_execute_query::<rustc_query_impl[441135ee144544b6]::plumbing::QueryCtxt, rustc_query_system[ddabab1eafb597f0]::query::caches::DefaultCache<(), (&std[9caeed11b21f461c]::collections::hash::set::HashSet<rustc_span[408aba7b93829b91]::def_id::DefId, core[295bdcd7e201aec9]::hash::BuildHasherDefault<rustc_hash[2ab1c81de4210e6f]::FxHasher>>, &[rustc_middle[a177af8518e4397e]::mir::mono::CodegenUnit])>>
  22:     0x7f3aa3df1a24 - rustc_query_system[ddabab1eafb597f0]::query::plumbing::get_query::<rustc_query_impl[441135ee144544b6]::queries::collect_and_partition_mono_items, rustc_query_impl[441135ee144544b6]::plumbing::QueryCtxt>
  23:     0x7f3aa3df195e - <rustc_query_impl[441135ee144544b6]::Queries as rustc_middle[a177af8518e4397e]::ty::query::QueryEngine>::collect_and_partition_mono_items
  24:     0x7f3aa3cf444b - rustc_codegen_ssa[ec46c1e35304f29e]::base::codegen_crate::<rustc_codegen_llvm[c5895aada7efadbf]::LlvmCodegenBackend>
  25:     0x7f3aa3cf41f9 - <rustc_codegen_llvm[c5895aada7efadbf]::LlvmCodegenBackend as rustc_codegen_ssa[ec46c1e35304f29e]::traits::backend::CodegenBackend>::codegen_crate
  26:     0x7f3aa3803c81 - <rustc_session[fff9c52cf8bf58c5]::session::Session>::time::<alloc[101a34d45fdb044a]::boxed::Box<dyn core[295bdcd7e201aec9]::any::Any>, rustc_interface[c8c7d65f4d7c863b]::passes::start_codegen::{closure#0}>
  27:     0x7f3aa38037a9 - rustc_interface[c8c7d65f4d7c863b]::passes::start_codegen
  28:     0x7f3aa38026b6 - <rustc_interface[c8c7d65f4d7c863b]::passes::QueryContext>::enter::<<rustc_interface[c8c7d65f4d7c863b]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[295bdcd7e201aec9]::result::Result<alloc[101a34d45fdb044a]::boxed::Box<dyn core[295bdcd7e201aec9]::any::Any>, rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>>
  29:     0x7f3aa37ffed6 - <rustc_interface[c8c7d65f4d7c863b]::queries::Queries>::ongoing_codegen
  30:     0x7f3aa37ff3b1 - <rustc_interface[c8c7d65f4d7c863b]::interface::Compiler>::enter::<rustc_driver[a56d989e388971fc]::run_compiler::{closure#1}::{closure#2}, core[295bdcd7e201aec9]::result::Result<core[295bdcd7e201aec9]::option::Option<rustc_interface[c8c7d65f4d7c863b]::queries::Linker>, rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>>
  31:     0x7f3aa37fa358 - rustc_span[408aba7b93829b91]::with_source_map::<core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>, rustc_interface[c8c7d65f4d7c863b]::interface::run_compiler<core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>, rustc_driver[a56d989e388971fc]::run_compiler::{closure#1}>::{closure#0}::{closure#0}>
  32:     0x7f3aa37f9e45 - <scoped_tls[c17d4fcbe085de89]::ScopedKey<rustc_span[408aba7b93829b91]::SessionGlobals>>::set::<rustc_interface[c8c7d65f4d7c863b]::interface::run_compiler<core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>, rustc_driver[a56d989e388971fc]::run_compiler::{closure#1}>::{closure#0}, core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>>
  33:     0x7f3aa37f9432 - std[9caeed11b21f461c]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[c8c7d65f4d7c863b]::util::run_in_thread_pool_with_globals<rustc_interface[c8c7d65f4d7c863b]::interface::run_compiler<core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>, rustc_driver[a56d989e388971fc]::run_compiler::{closure#1}>::{closure#0}, core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>>
  34:     0x7f3aa3f31518 - <<std[9caeed11b21f461c]::thread::Builder>::spawn_unchecked_<rustc_interface[c8c7d65f4d7c863b]::util::run_in_thread_pool_with_globals<rustc_interface[c8c7d65f4d7c863b]::interface::run_compiler<core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>, rustc_driver[a56d989e388971fc]::run_compiler::{closure#1}>::{closure#0}, core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>>::{closure#0}::{closure#0}, core[295bdcd7e201aec9]::result::Result<(), rustc_errors[a151aa0c6b700682]::ErrorGuaranteed>>::{closure#1} as core[295bdcd7e201aec9]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  35:     0x7f3aa5434b33 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h0e5495d7a0467227
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/alloc/src/boxed.rs:2000:9
  36:     0x7f3aa5434b33 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hf2dc136765fe433b
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/alloc/src/boxed.rs:2000:9
  37:     0x7f3aa5434b33 - std::sys::unix::thread::Thread::new::thread_start::h249747de8b82cef9
                               at /rustc/7632db0e87d8adccc9a83a47795c9411b1455855/library/std/src/sys/unix/thread.rs:108:17
  38:     0x7f3aa1226609 - start_thread
  39:     0x7f3aa1149133 - clone
  40:                0x0 - <unknown>
error: could not compile `playground`

[chenyukang]

@rustbot claim

[chenyukang]

@compiler-errors
this ICE now triggered with this error message:

error: internal compiler error: compiler/rustc_middle/src/ty/instance.rs:411:25: failed to resolve instance for <fn() -> impl MyFnOnce {my_fn_2} as MyFnOnce>::call_my_fn_once: Ok(
                                    None,
                                )

thread 'rustc' panicked at /Users/yukang/rust/compiler/rustc_errors/src/lib.rs:1635:9:
Box<dyn Any>
stack backtrace:
   0: std::panicking::begin_panic::<rustc_errors::ExplicitBug>
             at ./library/std/src/panicking.rs:649:12
   1: std::panic::panic_any::<rustc_errors::ExplicitBug>
             at ./library/std/src/panic.rs:63:5
   2: <rustc_errors::HandlerInner>::bug::<alloc::string::String>
             at ./compiler/rustc_errors/src/lib.rs:1635:9
   3: <rustc_errors::Handler>::bug::<alloc::string::String>
             at ./compiler/rustc_errors/src/lib.rs:1048:9
   4: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>::{closure#0}
             at ./compiler/rustc_middle/src/util/bug.rs:35:34
   5: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}
             at ./compiler/rustc_middle/src/ty/context/tls.rs:154:36
   6: rustc_middle::ty::context::tls::with_context_opt::<rustc_middle::ty::context::tls::with_opt<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>::{closure#0}, !>
             at ./compiler/rustc_middle/src/ty/context/tls.rs:100:18
   7: rustc_middle::ty::context::tls::with_opt::<rustc_middle::util::bug::opt_span_bug_fmt<rustc_span::span_encoding::Span>::{closure#0}, !>
             at ./compiler/rustc_middle/src/ty/context/tls.rs:154:5
   8: rustc_middle::util::bug::opt_span_bug_fmt::<rustc_span::span_encoding::Span>
             at ./compiler/rustc_middle/src/util/bug.rs:31:5
   9: rustc_middle::util::bug::bug_fmt
             at ./compiler/rustc_middle/src/util/bug.rs:15:5
  10: <rustc_middle::ty::instance::Instance>::expect_resolve
             at ./compiler/rustc_middle/src/ty/instance.rs:411:25
  11: rustc_monomorphize::collector::visit_fn_use
             at ./compiler/rustc_monomorphize/src/collector.rs:880:13
  12: <rustc_monomorphize::collector::MirUsedCollector as rustc_middle::mir::visit::Visitor>::visit_terminator
             at ./compiler/rustc_monomorphize/src/collector.rs:744:17

since your PR #105569 landed.

do you any idea on how to resolve it?
I'm not sure whether this is a valid program...