ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError' #66353

azriel91 · 2019-11-13T00:04:32Z

When using zipped iterators in a certain section of code, I hit an ICE.

I've attached the project source -- sorry I could not produce a minimum example though I tried. Also, it's closed source, though I own it so can choose to provide the snapshot.

Symptoms:

Normally using zipped iterators doesn't cause an ICE, but in this case it is consistent (clean build, using rustc 1.39.0 (4560ea788 2019-11-04), and rustc 1.40.0-nightly (1423bec54 2019-11-05)).
Not zipping the iterators, and using .get(..) prevents the ICE from occurring.

This code fails to compile:

// These are calls to `slotmap::SparseSecondaryMap::get`
let ui_menu_items = asset_ui_menu_items.get(asset_id);
let ui_labels = asset_ui_labels.get(asset_id);
let position_inits = asset_position_inits.get(asset_id);

if let (Some(ui_menu_items), Some(ui_labels), Some(position_inits)) =
    (ui_menu_items, ui_labels, position_inits)
{
    let menu_items = ui_menu_items
        .iter()
        .enumerate()
        .zip(position_inits.iter())
        .zip(ui_labels.iter())
        .map(|(((order, ui_menu_item), position_init), ui_label)| {
            // ..
        });
}

This code compiles:

// These are calls to `slotmap::SparseSecondaryMap::get`
let ui_menu_items = asset_ui_menu_items.get(asset_id);
let ui_labels = asset_ui_labels.get(asset_id);
let position_inits = asset_position_inits.get(asset_id);

if let (Some(ui_menu_items), Some(ui_labels), Some(position_inits)) =
    (ui_menu_items, ui_labels, position_inits)
{
    let menu_items = ui_menu_items
        .iter()
        .enumerate()
        .map(|(order, ui_menu_item)| {
            //..
            let ui_label = ui_labels.get(order).unwrap_or_else(|| { /**/ });
            let position_init = position_inits.get(order).copied().unwrap_or_else(|| { /**/ });

            // ..
        });
}

Compilation error message:

thread 'rustc' panicked at 'already borrowed: BorrowMutError', src/libcore/result.rs:1165:5

# stack trace omitted, I've included it further down

note: rustc 1.39.0 (4560ea788 2019-11-04) running on x86_64-unknown-linux-gnu
note: compiler flags: -C debuginfo=2 -C incremental --crate-type lib
note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [typeck_tables_of] processing `system::game_mode_selection_widget_ui_system::GameModeSelectionWidgetUiSystem::initialize_ui`
#1 [typeck_item_bodies] type-checking all item bodies
#2 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `game_mode_selection_ui`.

Meta

rustc --version --verbose:

1.39 (stable):

rustc 1.39.0 (4560ea788 2019-11-04)
binary: rustc
commit-hash: 4560ea788cb760f0a34127156c78e2552949f734
commit-date: 2019-11-04
host: x86_64-unknown-linux-gnu
release: 1.39.0
LLVM version: 9.0

1.40 (nightly):

rustc 1.40.0-nightly (1423bec54 2019-11-05)
binary: rustc
commit-hash: 1423bec54cf2db283b614e527cfd602b481485d1
commit-date: 2019-11-05
host: x86_64-unknown-linux-gnu
release: 1.40.0-nightly
LLVM version: 9.0

Backtrace:

1.39 stable

stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:76
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:60
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1030
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1412
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:64
   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:196
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:210
  10: rustc_driver::report_ice
  11: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:477
  12: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:380
  13: rust_begin_unwind
             at src/libstd/panicking.rs:307
  14: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  15: core::result::unwrap_failed
             at src/libcore/result.rs:1165
  16: rustc_typeck::check::Inherited::register_predicate
  17: rustc_typeck::check::Inherited::register_predicates
  18: <rustc_typeck::check::FnCtxt as rustc_typeck::astconv::AstConv>::normalize_ty
  19: <dyn rustc_typeck::astconv::AstConv>::res_to_ty
  20: <dyn rustc_typeck::astconv::AstConv>::ast_ty_to_ty
  21: rustc_typeck::check::FnCtxt::check_argument_types
  22: rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt>::confirm_builtin_call
  23: rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt>::check_call
  24: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  25: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  26: rustc_typeck::check::FnCtxt::check_decl_initializer
  27: rustc_typeck::check::FnCtxt::check_decl_local
  28: rustc_typeck::check::FnCtxt::check_stmt
  29: rustc_typeck::check::FnCtxt::check_block_with_expected
  30: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  31: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  32: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_return_expr
  33: rustc_typeck::check::check_fn
  34: rustc_typeck::check::closure::<impl rustc_typeck::check::FnCtxt>::check_expr_closure
  35: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  36: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  37: rustc_typeck::check::FnCtxt::check_argument_types
  38: rustc_typeck::check::FnCtxt::check_method_argument_types
  39: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  40: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  41: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  42: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  43: rustc_typeck::check::FnCtxt::check_decl_initializer
  44: rustc_typeck::check::FnCtxt::check_decl_local
  45: rustc_typeck::check::FnCtxt::check_stmt
  46: rustc_typeck::check::FnCtxt::check_block_with_expected
  47: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  48: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  49: rustc_typeck::check::_match::<impl rustc_typeck::check::FnCtxt>::check_match
  50: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  51: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  52: rustc_typeck::check::FnCtxt::check_block_with_expected
  53: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  54: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  55: rustc_typeck::check::_match::<impl rustc_typeck::check::FnCtxt>::check_match
  56: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  57: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  58: rustc_typeck::check::FnCtxt::check_block_with_expected
  59: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  60: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  61: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_return_expr
  62: rustc_typeck::check::check_fn
  63: rustc::ty::context::GlobalCtxt::enter_local
  64: rustc_typeck::check::typeck_tables_of
  65: rustc::ty::query::__query_compute::typeck_tables_of
  66: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::typeck_tables_of>::compute
  67: rustc::dep_graph::graph::DepGraph::with_task_impl
  68: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  69: rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners
  70: rustc_typeck::check::typeck_item_bodies
  71: rustc::ty::query::__query_compute::typeck_item_bodies
  72: rustc::dep_graph::graph::DepGraph::with_task_impl
  73: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  74: rustc::util::common::time
  75: rustc_typeck::check_crate
  76: rustc_interface::passes::analysis
  77: rustc::ty::query::__query_compute::analysis
  78: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  79: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
  80: rustc_interface::passes::create_global_ctxt::{{closure}}
  81: rustc_interface::interface::run_compiler_in_existing_thread_pool
  82: std::thread::local::LocalKey<T>::with
  83: scoped_tls::ScopedKey<T>::set
  84: syntax::with_globals

1.40 nightly

stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:77
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:61
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1028
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1412
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:65
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:50
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:188
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:205
  10: rustc_driver::report_ice
  11: <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call
             at /rustc/1423bec54cf2db283b614e527cfd602b481485d1/src/liballoc/boxed.rs:956
  12: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::{{closure}}
             at /rustc/1423bec54cf2db283b614e527cfd602b481485d1/src/libproc_macro/bridge/client.rs:305
  13: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:468
  14: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:373
  15: rust_begin_unwind
             at src/libstd/panicking.rs:302
  16: core::panicking::panic_fmt
             at src/libcore/panicking.rs:139
  17: core::result::unwrap_failed
             at src/libcore/result.rs:1165
  18: rustc_typeck::check::Inherited::register_predicate
  19: rustc_typeck::check::Inherited::register_predicates
  20: <rustc_typeck::check::FnCtxt as rustc_typeck::astconv::AstConv>::normalize_ty
  21: <dyn rustc_typeck::astconv::AstConv>::res_to_ty
  22: <dyn rustc_typeck::astconv::AstConv>::ast_ty_to_ty
  23: rustc_typeck::check::FnCtxt::check_argument_types
  24: rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt>::confirm_builtin_call
  25: rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt>::check_call
  26: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  27: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  28: rustc_typeck::check::FnCtxt::check_decl_initializer
  29: rustc_typeck::check::FnCtxt::check_decl_local
  30: rustc_typeck::check::FnCtxt::check_stmt
  31: rustc_typeck::check::FnCtxt::check_block_with_expected
  32: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  33: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  34: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_return_expr
  35: rustc_typeck::check::check_fn
  36: rustc_typeck::check::closure::<impl rustc_typeck::check::FnCtxt>::check_expr_closure
  37: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  38: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  39: rustc_typeck::check::FnCtxt::check_argument_types
  40: rustc_typeck::check::FnCtxt::check_method_argument_types
  41: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  42: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  43: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  44: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  45: rustc_typeck::check::FnCtxt::check_decl_initializer
  46: rustc_typeck::check::FnCtxt::check_decl_local
  47: rustc_typeck::check::FnCtxt::check_stmt
  48: rustc_typeck::check::FnCtxt::check_block_with_expected
  49: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  50: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  51: rustc_typeck::check::_match::<impl rustc_typeck::check::FnCtxt>::check_match
  52: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  53: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  54: rustc_typeck::check::FnCtxt::check_block_with_expected
  55: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  56: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  57: rustc_typeck::check::_match::<impl rustc_typeck::check::FnCtxt>::check_match
  58: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  59: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  60: rustc_typeck::check::FnCtxt::check_block_with_expected
  61: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_kind
  62: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_expr_with_expectation_and_needs
  63: rustc_typeck::check::expr::<impl rustc_typeck::check::FnCtxt>::check_return_expr
  64: rustc_typeck::check::check_fn
  65: rustc::ty::context::tls::with_context::{{closure}}
  66: rustc_typeck::check::typeck_tables_of
  67: rustc::ty::query::__query_compute::typeck_tables_of
  68: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::typeck_tables_of>::compute
  69: rustc::dep_graph::graph::DepGraph::with_task_impl
  70: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  71: rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners
  72: rustc_typeck::check::typeck_item_bodies
  73: rustc::ty::query::__query_compute::typeck_item_bodies
  74: rustc::dep_graph::graph::DepGraph::with_task_impl
  75: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  76: rustc::util::common::time
  77: rustc_typeck::check_crate
  78: rustc_interface::passes::analysis
  79: rustc::ty::query::__query_compute::analysis
  80: rustc::dep_graph::graph::DepGraph::with_task_impl
  81: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  82: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
  83: rustc_interface::passes::create_global_ctxt::{{closure}}
  84: rustc_interface::passes::BoxedGlobalCtxt::enter
  85: rustc_interface::interface::run_compiler_in_existing_thread_pool
  86: std::thread::local::LocalKey<T>::with
  87: scoped_tls::ScopedKey<T>::set
  88: syntax::with_globals

Investigation:

Steps to reproduce:

Download ICE-borrow-mut.zip
Extract and run cargo build

Relevant source file:

# from project root, lines 168 onwards of
crate/game_mode_selection_ui/src/system/game_mode_selection_widget_ui_system.rs

Interestingly, using .copied() on the position_inits iterator on the ICE-ing code allows it to compile:

.zip(position_inits.iter().copied())

Also interestingly, using the position_inits.get(order) version within .map(..) without .copied() also causes the ICE, so it's not the zipping that's causing it, but rather something to do with the position_init being a reference rather than an owned value.

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

hellow554 · 2019-11-13T09:50:09Z

Seems to be an issue with nalgebra::Vector3

use nalgebra::base::Vector3;

fn crash() {
    Into::<Vector3<f32>>::into(0);
}

Crash on stable, beta, nightly

hellow554 · 2019-11-13T13:05:14Z

@Centril regression from stable-to-stable 🤕
1.38.0 "worked"

error[E0277]: the trait bound `nalgebra::base::matrix::Matrix<f32, nalgebra::base::dimension::U3, nalgebra::base::dimension::U1, nalgebra::base::array_storage::ArrayStorage<f32, nalgebra::base::dimension::U3, nalgebra::base::dimension::U1>>: std::convert::From<{integer}>` is not satisfied
 --> src/main.rs:4:5
  |
4 |     Into::<Vector3<f32>>::into(0);
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::convert::From<{integer}>` is not implemented for `nalgebra::base::matrix::Matrix<f32, nalgebra::base::dimension::U3, nalgebra::base::dimension::U1, nalgebra::base::array_storage::ArrayStorage<f32, nalgebra::base::dimension::U3, nalgebra::base::dimension::U1>>`

Centril · 2019-11-13T13:08:38Z

@hellow554 A reduction would be good :)

hellow554 · 2019-11-13T13:09:33Z

@hellow554 A reduction would be good :)

I'm on it.

hellow554 · 2019-11-13T16:17:56Z

You want a MCVE? I give you a MCVE! 👊

pub trait Func<T> {
    fn func(self);
}

pub trait A {
    type AssocT;
}

impl A for () {
    type AssocT = ();
}

pub fn crash() {
    Func::<std::marker::PhantomData<<() as A>::AssocT>>::func(());
}

@rustbot modify labels: -E-needs-mcve +E-needs-bisection

Centril · 2019-11-13T16:29:13Z

Reduced:

trait _Func<T> {
    fn func(_: Self);
}

trait _A {
    type AssocT;
}

fn crash() {
    _Func::< <() as _A>::AssocT >::func(());
}

hellow554 · 2019-11-13T16:36:20Z

regression between 1dd1884...66bf391

Centril · 2019-11-13T16:56:47Z

cc @estebank

csmoe · 2019-11-13T16:57:07Z

#64151 is the one to blame .

pnkfelix · 2019-11-14T10:28:23Z

triage: P-high. Removing nomination label.

@Centril

Do not ICE on recovery from unmet associated type bound obligation Fix rust-lang#66353. r? @Centril

@Centril

Do not ICE on recovery from unmet associated type bound obligation Fix rust-lang#66353. r? @Centril

azriel91 changed the title ~~ICE when using variables from zipped iterator: thread 'rustc' panicked at 'already borrowed: BorrowMutError'~~ ICE when using variable from zipped iterator: thread 'rustc' panicked at 'already borrowed: BorrowMutError' Nov 13, 2019

azriel91 changed the title ~~ICE when using variable from zipped iterator: thread 'rustc' panicked at 'already borrowed: BorrowMutError'~~ ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError' Nov 13, 2019

JuanPotato added A-borrow-checker Area: The borrow checker 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 Nov 13, 2019

Centril added I-nominated A-typesystem Area: The type system and removed A-borrow-checker Area: The borrow checker labels Nov 13, 2019

jonas-schievink added E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example regression-from-stable-to-stable Performance or correctness regression from one stable version to another. labels Nov 13, 2019

rustbot added E-needs-bisection Call for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc and removed E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example labels Nov 13, 2019

Centril assigned estebank and varkor Nov 13, 2019

estebank mentioned this issue Nov 13, 2019

Do not ICE on recovery from unmet associated type bound obligation #66388

Merged

pnkfelix added P-high High priority and removed I-nominated labels Nov 14, 2019

JohnTitor added a commit to JohnTitor/rust that referenced this issue Nov 15, 2019

Rollup merge of rust-lang#66388 - estebank:melt-ice, r=Centril

f353022

Do not ICE on recovery from unmet associated type bound obligation Fix rust-lang#66353. r? @Centril

JohnTitor added a commit to JohnTitor/rust that referenced this issue Nov 15, 2019

Rollup merge of rust-lang#66388 - estebank:melt-ice, r=Centril

180de59

Do not ICE on recovery from unmet associated type bound obligation Fix rust-lang#66353. r? @Centril

bors closed this as completed in c8d8f52 Nov 15, 2019

hellow554 mentioned this issue Nov 26, 2019

nalgebra NoSolution Broken MIR ICE #66768

Closed

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ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError' #66353

ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError' #66353

azriel91 commented Nov 13, 2019 •

edited

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hellow554 commented Nov 13, 2019

hellow554 commented Nov 13, 2019

Centril commented Nov 13, 2019

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hellow554 commented Nov 13, 2019

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pnkfelix commented Nov 14, 2019

ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError' #66353

ICE when using reference variable from iterator (instead of copying it): thread 'rustc' panicked at 'already borrowed: BorrowMutError' #66353

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