Compiler error on get_vtable_index_of_object_method #97381
Closed
Description
I tried this code:
use std::ops::Deref;
trait MyTrait: Deref<Target = u32> {}
struct MyStruct(u32);
impl MyTrait for MyStruct {}
impl Deref for MyStruct {
type Target = u32;
fn deref(&self) -> &Self::Target {
&self.0
}
}
fn get_concrete_value(i: u32) -> MyStruct {
MyStruct(i)
}
fn get_boxed_value(i: u32) -> Box<dyn MyTrait> {
Box::new(get_concrete_value(i))
}
fn main() {
let v = [1, 2, 3]
.iter()
.map(|i| get_boxed_value(*i))
.collect::<Vec<_>>();
let el = &v[0];
for _ in v {
// this triggers bug
println!("{}", ***el > 0);
}
}I expected to see this happen: 'el' will be derefed as u32
Instead, this happened: compiler complains
Meta
rustc --version --verbose:
rustc 1.61.0 (fe5b13d68 2022-05-18)
binary: rustc
commit-hash: fe5b13d681f25ee6474be29d748c65adcd91f69e
commit-date: 2022-05-18
host: x86_64-unknown-linux-gnu
release: 1.61.0
LLVM version: 14.0.0
Backtrace
thread 'rustc' panicked at 'Box<dyn Any>', compiler/rustc_errors/src/lib.rs:1279:9
stack backtrace:
0: 0x7f1624d741cd - std::backtrace_rs::backtrace::libunwind::trace::h22893a5306c091b4
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x7f1624d741cd - std::backtrace_rs::backtrace::trace_unsynchronized::h29c3bc6f9e91819d
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x7f1624d741cd - std::sys_common::backtrace::_print_fmt::he497d8a0ec903793
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/sys_common/backtrace.rs:66:5
3: 0x7f1624d741cd - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h9c2a9d2774d81873
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/sys_common/backtrace.rs:45:22
4: 0x7f1624dce01c - core::fmt::write::hba4337c43d992f49
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/core/src/fmt/mod.rs:1194:17
5: 0x7f1624d657c1 - std::io::Write::write_fmt::heb73de6e02cfabed
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/io/mod.rs:1655:15
6: 0x7f1624d772b5 - std::sys_common::backtrace::_print::h63c8b24acdd8e8ce
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/sys_common/backtrace.rs:48:5
7: 0x7f1624d772b5 - std::sys_common::backtrace::print::h426700d6240cdcc2
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/sys_common/backtrace.rs:35:9
8: 0x7f1624d772b5 - std::panicking::default_hook::{{closure}}::hc9a76eed0b18f82b
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/panicking.rs:295:22
9: 0x7f1624d76f69 - std::panicking::default_hook::h2e88d02087fae196
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/panicking.rs:314:9
10: 0x7f16254f41d1 - rustc_driver[413d55b6344850e3]::DEFAULT_HOOK::{closure#0}::{closure#0}
11: 0x7f1624d77a00 - std::panicking::rust_panic_with_hook::habfdcc2e90f9fd4c
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/panicking.rs:702:17
12: 0x7f16265c4141 - std[3b302b3c9093c22]::panicking::begin_panic::<rustc_errors[a7dbbf867eaca825]::ExplicitBug>::{closure#0}
13: 0x7f16265c3e96 - std[3b302b3c9093c22]::sys_common::backtrace::__rust_end_short_backtrace::<std[3b302b3c9093c22]::panicking::begin_panic<rustc_errors[a7dbbf867eaca825]::ExplicitBug>::{closure#0}, !>
14: 0x7f16265cb406 - std[3b302b3c9093c22]::panicking::begin_panic::<rustc_errors[a7dbbf867eaca825]::ExplicitBug>
15: 0x7f16265d7ec6 - std[3b302b3c9093c22]::panic::panic_any::<rustc_errors[a7dbbf867eaca825]::ExplicitBug>
16: 0x7f16265d9673 - <rustc_errors[a7dbbf867eaca825]::HandlerInner>::bug
17: 0x7f16265d90d0 - <rustc_errors[a7dbbf867eaca825]::Handler>::bug
18: 0x7f1626518636 - rustc_middle[9ca07169fec39ed9]::ty::context::tls::with_opt::<rustc_middle[9ca07169fec39ed9]::util::bug::opt_span_bug_fmt<rustc_span[7238ca7210ca999e]::span_encoding::Span>::{closure#0}, ()>
19: 0x7f162651b746 - rustc_middle[9ca07169fec39ed9]::util::bug::opt_span_bug_fmt::<rustc_span[7238ca7210ca999e]::span_encoding::Span>
20: 0x7f162651b6c3 - rustc_middle[9ca07169fec39ed9]::util::bug::bug_fmt
21: 0x7f16276f06e9 - rustc_trait_selection[2e17e0f1454142da]::traits::util::get_vtable_index_of_object_method::<()>
22: 0x7f1626a27cea - rustc_ty_utils[1a711ca447a2a51a]::instance::inner_resolve_instance
23: 0x7f1626a2602f - rustc_ty_utils[1a711ca447a2a51a]::instance::resolve_instance
24: 0x7f1626e4fa54 - rustc_query_system[ac245aac4c1950a0]::query::plumbing::get_query::<rustc_query_impl[b0f4194b24b225ee]::queries::resolve_instance, rustc_query_impl[b0f4194b24b225ee]::plumbing::QueryCtxt>
25: 0x7f1626f04868 - <rustc_query_impl[b0f4194b24b225ee]::Queries as rustc_middle[9ca07169fec39ed9]::ty::query::QueryEngine>::resolve_instance
26: 0x7f162727aa00 - <rustc_middle[9ca07169fec39ed9]::ty::instance::Instance>::resolve
27: 0x7f1625cc5cbb - rustc_const_eval[10f0603c48acc95d]::util::call_kind::call_kind
28: 0x7f1625affe9f - <rustc_borrowck[20c91c3baf1e28a2]::MirBorrowckCtxt>::move_spans
29: 0x7f1625af780f - <rustc_borrowck[20c91c3baf1e28a2]::MirBorrowckCtxt>::explain_why_borrow_contains_point
30: 0x7f1625aef995 - <rustc_borrowck[20c91c3baf1e28a2]::MirBorrowckCtxt>::report_move_out_while_borrowed
31: 0x7f16277ec105 - <rustc_borrowck[20c91c3baf1e28a2]::MirBorrowckCtxt as rustc_mir_dataflow[6b276981176d0a5e]::framework::visitor::ResultsVisitor>::visit_statement_before_primary_effect
32: 0x7f1626beda48 - rustc_mir_dataflow[6b276981176d0a5e]::framework::visitor::visit_results::<rustc_borrowck[20c91c3baf1e28a2]::dataflow::BorrowckAnalyses<rustc_index[db082642455f6dc9]::bit_set::BitSet<rustc_borrowck[20c91c3baf1e28a2]::dataflow::BorrowIndex>, rustc_index[db082642455f6dc9]::bit_set::ChunkedBitSet<rustc_mir_dataflow[6b276981176d0a5e]::move_paths::MovePathIndex>, rustc_index[db082642455f6dc9]::bit_set::ChunkedBitSet<rustc_mir_dataflow[6b276981176d0a5e]::move_paths::InitIndex>>, rustc_borrowck[20c91c3baf1e28a2]::dataflow::BorrowckAnalyses<rustc_mir_dataflow[6b276981176d0a5e]::framework::engine::Results<rustc_borrowck[20c91c3baf1e28a2]::dataflow::Borrows>, rustc_mir_dataflow[6b276981176d0a5e]::framework::engine::Results<rustc_mir_dataflow[6b276981176d0a5e]::impls::MaybeUninitializedPlaces>, rustc_mir_dataflow[6b276981176d0a5e]::framework::engine::Results<rustc_mir_dataflow[6b276981176d0a5e]::impls::EverInitializedPlaces>>, core[a3420257622cd381]::iter::adapters::map::Map<rustc_middle[9ca07169fec39ed9]::mir::traversal::ReversePostorder, rustc_borrowck[20c91c3baf1e28a2]::do_mir_borrowck::{closure#2}>, rustc_borrowck[20c91c3baf1e28a2]::MirBorrowckCtxt>
33: 0x7f1626c99fb3 - rustc_borrowck[20c91c3baf1e28a2]::do_mir_borrowck
34: 0x7f1626c8df19 - rustc_borrowck[20c91c3baf1e28a2]::mir_borrowck
35: 0x7f1626c8abb0 - <rustc_borrowck[20c91c3baf1e28a2]::provide::{closure#0} as core[a3420257622cd381]::ops::function::FnOnce<(rustc_middle[9ca07169fec39ed9]::ty::context::TyCtxt, rustc_span[7238ca7210ca999e]::def_id::LocalDefId)>>::call_once
36: 0x7f1626e21461 - rustc_query_system[ac245aac4c1950a0]::query::plumbing::try_execute_query::<rustc_query_impl[b0f4194b24b225ee]::plumbing::QueryCtxt, rustc_query_system[ac245aac4c1950a0]::query::caches::DefaultCache<rustc_span[7238ca7210ca999e]::def_id::LocalDefId, &rustc_middle[9ca07169fec39ed9]::mir::query::BorrowCheckResult>>
37: 0x7f1626f017ca - <rustc_query_impl[b0f4194b24b225ee]::Queries as rustc_middle[9ca07169fec39ed9]::ty::query::QueryEngine>::mir_borrowck
38: 0x7f162672184f - <rustc_session[8df92abe178df33c]::session::Session>::time::<(), rustc_interface[550884b2b179878f]::passes::analysis::{closure#2}>
39: 0x7f16273f6b45 - rustc_interface[550884b2b179878f]::passes::analysis
40: 0x7f16278bcdee - rustc_query_system[ac245aac4c1950a0]::query::plumbing::try_execute_query::<rustc_query_impl[b0f4194b24b225ee]::plumbing::QueryCtxt, rustc_query_system[ac245aac4c1950a0]::query::caches::DefaultCache<(), core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>>
41: 0x7f16278ffdfe - rustc_query_system[ac245aac4c1950a0]::query::plumbing::get_query::<rustc_query_impl[b0f4194b24b225ee]::queries::analysis, rustc_query_impl[b0f4194b24b225ee]::plumbing::QueryCtxt>
42: 0x7f16273bc881 - <rustc_interface[550884b2b179878f]::passes::QueryContext>::enter::<rustc_driver[413d55b6344850e3]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>
43: 0x7f16273d6a58 - <rustc_interface[550884b2b179878f]::interface::Compiler>::enter::<rustc_driver[413d55b6344850e3]::run_compiler::{closure#1}::{closure#2}, core[a3420257622cd381]::result::Result<core[a3420257622cd381]::option::Option<rustc_interface[550884b2b179878f]::queries::Linker>, rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>
44: 0x7f16273bc03f - rustc_span[7238ca7210ca999e]::with_source_map::<core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>, rustc_interface[550884b2b179878f]::interface::create_compiler_and_run<core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>, rustc_driver[413d55b6344850e3]::run_compiler::{closure#1}>::{closure#1}>
45: 0x7f16273d80a4 - rustc_interface[550884b2b179878f]::interface::create_compiler_and_run::<core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>, rustc_driver[413d55b6344850e3]::run_compiler::{closure#1}>
46: 0x7f16273ba7c2 - <scoped_tls[7ed3ce20ede545d8]::ScopedKey<rustc_span[7238ca7210ca999e]::SessionGlobals>>::set::<rustc_interface[550884b2b179878f]::interface::run_compiler<core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>, rustc_driver[413d55b6344850e3]::run_compiler::{closure#1}>::{closure#0}, core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>
47: 0x7f16273d038f - std[3b302b3c9093c22]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[550884b2b179878f]::util::run_in_thread_pool_with_globals<rustc_interface[550884b2b179878f]::interface::run_compiler<core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>, rustc_driver[413d55b6344850e3]::run_compiler::{closure#1}>::{closure#0}, core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>::{closure#0}, core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>
48: 0x7f16273bbaf9 - <<std[3b302b3c9093c22]::thread::Builder>::spawn_unchecked_<rustc_interface[550884b2b179878f]::util::run_in_thread_pool_with_globals<rustc_interface[550884b2b179878f]::interface::run_compiler<core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>, rustc_driver[413d55b6344850e3]::run_compiler::{closure#1}>::{closure#0}, core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>::{closure#0}, core[a3420257622cd381]::result::Result<(), rustc_errors[a7dbbf867eaca825]::ErrorGuaranteed>>::{closure#1} as core[a3420257622cd381]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
49: 0x7f1624d81bf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha99802c2c52ada61
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/alloc/src/boxed.rs:1861:9
50: 0x7f1624d81bf3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha39aea1c57e28a15
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/alloc/src/boxed.rs:1861:9
51: 0x7f1624d81bf3 - std::sys::unix::thread::Thread::new::thread_start::h9f8e3d72b1f7662f
at /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/std/src/sys/unix/thread.rs:108:17
52: 0x7f1624b4c8ca - start_thread
53: 0x7f1624aec500 - __GI___clone3
54: 0x0 - <unknown>
Rust playground link for the same code:
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