Loom panics

[terrarier2111]

when trying to use loom, it just panics all the time:

stack backtrace:
thread '<unnamed>' panicked at 'index out of bounds: the len is 0 but the index is 0', /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:382:25
   0: rust_begin_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/panicking.rs:64:14
   2: core::panicking::panic_bounds_check
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/panicking.rs:159:5
   3: <usize as core::slice::index::SliceIndex<[T]>>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/slice/index.rs:260:10
   4: core::slice::index::<impl core::ops::index::Index<I> for [T]>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/slice/index.rs:18:9
   5: <alloc::vec::Vec<T,A> as core::ops::index::Index<I>>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/alloc/src/vec/mod.rs:2732:9
   6: loom::rt::object::Ref<T>::set_action
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:382:25
   7: loom::rt::object::Ref<T>::branch_action::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:354:13
   8: loom::rt::branch::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:119:19
   9: loom::rt::scheduler::Scheduler::with_execution::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:48:34
  10: loom::rt::scheduler::Scheduler::with_state::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:130:28
  11: scoped_tls::ScopedKey<T>::with
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.1/src/lib.rs:171:13
  12: loom::rt::scheduler::Scheduler::with_state
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:130:9
  13: loom::rt::scheduler::Scheduler::with_execution
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:48:9
  14: loom::rt::execution
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:171:5
  15: loom::rt::branch
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:118:25
  16: loom::rt::object::Ref<T>::branch_action
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:351:9
  17: loom::rt::atomic::Atomic<T>::branch
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/atomic.rs:389:9
  18: loom::rt::atomic::Atomic<T>::rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/atomic.rs:307:9
  19: loom::sync::atomic::atomic::Atomic<T>::try_rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/atomic.rs:57:9
  20: loom::sync::atomic::atomic::Atomic<T>::rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/atomic.rs:49:9
  21: loom::sync::atomic::int::AtomicUsize::fetch_add
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/int.rs:111:17
  22: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::load_internal
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:407:23
  23: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::load::{{closure}}
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:126:24
  24: thread_local::ThreadLocal<T>::get_or::{{closure}}
             at /home/threadexception/.cargo/git/checkouts/thread_local-rs-f6087f069186d8d8/436fa68/src/lib.rs:213:44
  25: thread_local::ThreadLocal<T>::get_or_try
             at /home/threadexception/.cargo/git/checkouts/thread_local-rs-f6087f069186d8d8/436fa68/src/lib.rs:248:24
  26: thread_local::ThreadLocal<T>::get_or
             at /home/threadexception/.cargo/git/checkouts/thread_local-rs-f6087f069186d8d8/436fa68/src/lib.rs:213:13
  27: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::load
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:125:22
  28: swap_arc::main::{{closure}}::{{closure}}::{{closure}}
             at /home/threadexception/Desktop/rust-playground/src/main.rs:38:34
  29: loom::model::Builder::check::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/model.rs:185:17
  30: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  31: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/alloc/src/boxed.rs:1988:9
  32: loom::rt::scheduler::spawn_threads::{{closure}}::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:149:21
  33: generator::gen_impl::GeneratorImpl<A,T>::init_code::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:344:21
  34: generator::stack::StackBox<F>::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:139:13
  35: generator::stack::Func::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:121:9
  36: generator::gen_impl::gen_init::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:560:9
  37: core::ops::function::FnOnce::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  38: std::panicking::try::do_call
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:483:40
  39: std::panicking::try
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:447:19
  40: std::panic::catch_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panic.rs:140:14
  41: generator::gen_impl::catch_unwind_filter
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:551:5
  42: generator::gen_impl::gen_init
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:578:25
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: rust_begin_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/panicking.rs:64:14
   2: core::panicking::panic_bounds_check
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/panicking.rs:159:5
   3: <usize as core::slice::index::SliceIndex<[T]>>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/slice/index.rs:260:10
   4: core::slice::index::<impl core::ops::index::Index<I> for [T]>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/slice/index.rs:18:9
   5: <alloc::vec::Vec<T,A> as core::ops::index::Index<I>>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/alloc/src/vec/mod.rs:2732:9
   6: loom::rt::object::Ref<T>::set_action
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:382:25
   7: loom::rt::object::Ref<T>::branch_action::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:354:13
   8: loom::rt::branch::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:119:19
   9: loom::rt::scheduler::Scheduler::with_execution::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:48:34
  10: loom::rt::scheduler::Scheduler::with_state::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:130:28
  11: scoped_tls::ScopedKey<T>::with
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.1/src/lib.rs:171:13
  12: loom::rt::scheduler::Scheduler::with_state
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:130:9
  13: loom::rt::scheduler::Scheduler::with_execution
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:48:9
  14: loom::rt::execution
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:171:5
  15: loom::rt::branch
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:118:25
  16: loom::rt::object::Ref<T>::branch_action
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:351:9
  17: loom::rt::atomic::Atomic<T>::branch
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/atomic.rs:389:9
  18: loom::rt::atomic::Atomic<T>::rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/atomic.rs:307:9
  19: loom::sync::atomic::atomic::Atomic<T>::try_rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/atomic.rs:57:9
  20: loom::sync::atomic::atomic::Atomic<T>::compare_exchange
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/atomic.rs:89:9
  21: loom::sync::atomic::int::AtomicUsize::compare_exchange
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/int.rs:93:17
  22: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::_store_raw
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:602:19
  23: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::store
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:577:13
  24: swap_arc::main::{{closure}}::{{closure}}::{{closure}}
             at /home/threadexception/Desktop/rust-playground/src/main.rs:66:25
  25: loom::model::Builder::check::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/model.rs:185:17
  26: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  27: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/alloc/src/boxed.rs:1988:9
  28: loom::rt::scheduler::spawn_threads::{{closure}}::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:149:21
  29: generator::gen_impl::GeneratorImpl<A,T>::init_code::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:344:21
  30: generator::stack::StackBox<F>::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:139:13
  31: generator::stack::Func::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:121:9
  32: generator::gen_impl::gen_init::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:560:9
  33: core::ops::function::FnOnce::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  34: std::panicking::try::do_call
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:483:40
  35: std::panicking::try
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:447:19
  36: std::panic::catch_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panic.rs:140:14
  37: generator::gen_impl::catch_unwind_filter
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:551:5
  38: generator::gen_impl::gen_init
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:578:25
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: rust_begin_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/panicking.rs:64:14
   2: core::panicking::panic_bounds_check
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/panicking.rs:159:5
   3: <usize as core::slice::index::SliceIndex<[T]>>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/slice/index.rs:260:10
   4: core::slice::index::<impl core::ops::index::Index<I> for [T]>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/slice/index.rs:18:9
   5: <alloc::vec::Vec<T,A> as core::ops::index::Index<I>>::index
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/alloc/src/vec/mod.rs:2732:9
   6: loom::rt::object::Ref<T>::set_action
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:382:25
   7: loom::rt::object::Ref<T>::branch_action::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:354:13
   8: loom::rt::branch::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:119:19
   9: loom::rt::scheduler::Scheduler::with_execution::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:48:34
  10: loom::rt::scheduler::Scheduler::with_state::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:130:28
  11: scoped_tls::ScopedKey<T>::with
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.1/src/lib.rs:171:13
  12: loom::rt::scheduler::Scheduler::with_state
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:130:9
  13: loom::rt::scheduler::Scheduler::with_execution
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:48:9
  14: loom::rt::execution
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:171:5
  15: loom::rt::branch
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/mod.rs:118:25
  16: loom::rt::object::Ref<T>::branch_action
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/object.rs:351:9
  17: loom::rt::atomic::Atomic<T>::branch
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/atomic.rs:389:9
  18: loom::rt::atomic::Atomic<T>::rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/atomic.rs:307:9
  19: loom::sync::atomic::atomic::Atomic<T>::try_rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/atomic.rs:57:9
  20: loom::sync::atomic::atomic::Atomic<T>::rmw
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/atomic.rs:49:9
  21: loom::sync::atomic::int::AtomicUsize::fetch_add
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/sync/atomic/int.rs:111:17
  22: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::load_internal
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:407:23
  23: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::load::{{closure}}
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:126:24
  24: thread_local::ThreadLocal<T>::get_or::{{closure}}
             at /home/threadexception/.cargo/git/checkouts/thread_local-rs-f6087f069186d8d8/436fa68/src/lib.rs:213:44
  25: thread_local::ThreadLocal<T>::get_or_try
             at /home/threadexception/.cargo/git/checkouts/thread_local-rs-f6087f069186d8d8/436fa68/src/lib.rs:248:24
  26: thread_local::ThreadLocal<T>::get_or
             at /home/threadexception/.cargo/git/checkouts/thread_local-rs-f6087f069186d8d8/436fa68/src/lib.rs:213:13
  27: swap_arc::swap_arc_tls_optimistic::SwapArcIntermediateTLS<T,D,_>::load
             at /home/threadexception/Desktop/rust-playground/src/swap_arc_tls_optimistic.rs:125:22
  28: swap_arc::main::{{closure}}::{{closure}}::{{closure}}
             at /home/threadexception/Desktop/rust-playground/src/main.rs:38:34
  29: loom::model::Builder::check::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/model.rs:185:17
  30: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  31: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/alloc/src/boxed.rs:1988:9
  32: loom::rt::scheduler::spawn_threads::{{closure}}::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:149:21
  33: generator::gen_impl::GeneratorImpl<A,T>::init_code::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:344:21
  34: generator::stack::StackBox<F>::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:139:13
  35: generator::stack::Func::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:121:9
  36: generator::gen_impl::gen_init::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:560:9
  37: core::ops::function::FnOnce::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  38: std::panicking::try::do_call
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:483:40
  39: std::panicking::try
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:447:19
  40: std::panic::catch_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panic.rs:140:14
  41: generator::gen_impl::catch_unwind_filter
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:551:5
  42: generator::gen_impl::gen_init
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:578:25
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Any { .. }', src/main.rs:76:46
stack backtrace:
   0: rust_begin_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/panicking.rs:64:14
   2: core::result::unwrap_failed
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/result.rs:1790:5
   3: core::result::Result<T,E>::unwrap
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/result.rs:1112:23
   4: swap_arc::main::{{closure}}::{{closure}}
             at /home/threadexception/Desktop/rust-playground/src/main.rs:76:32
   5: core::iter::traits::iterator::Iterator::for_each::call::{{closure}}
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/iter/traits/iterator.rs:834:29
   6: core::iter::traits::iterator::Iterator::fold
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/iter/traits/iterator.rs:2438:21
   7: core::iter::traits::iterator::Iterator::for_each
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/iter/traits/iterator.rs:837:9
   8: swap_arc::main::{{closure}}
             at /home/threadexception/Desktop/rust-playground/src/main.rs:74:9
   9: loom::model::Builder::check::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/model.rs:185:17
  10: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  11: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/alloc/src/boxed.rs:1988:9
  12: loom::rt::scheduler::spawn_threads::{{closure}}::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/scheduler.rs:149:21
  13: generator::gen_impl::GeneratorImpl<A,T>::init_code::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:344:21
  14: generator::stack::StackBox<F>::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:139:13
  15: generator::stack::Func::call_once
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/stack/mod.rs:121:9
  16: generator::gen_impl::gen_init::{{closure}}
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:560:9
  17: core::ops::function::FnOnce::call_once
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/core/src/ops/function.rs:250:5
  18: std::panicking::try::do_call
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:483:40
  19: std::panicking::try
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panicking.rs:447:19
  20: std::panic::catch_unwind
             at /rustc/d7948c843de94245c794e8c63dd4301a78bb5ba3/library/std/src/panic.rs:140:14
  21: generator::gen_impl::catch_unwind_filter
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:551:5
  22: generator::gen_impl::gen_init
             at /home/threadexception/.cargo/registry/src/github.com-1ecc6299db9ec823/generator-0.7.2/src/gen_impl.rs:578:25
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.```

[Darksonn]

We would need more information to help you.

[terrarier2111]

We would need more information to help you.

What kinds of information should I provide in order to enable you to help me?

[Darksonn]

What code did you run to run into this issue?

[terrarier2111]

I tried this code: https://github.com/terrarier2111/SwapArc/tree/loom

[terrarier2111]

just use cargo run on it

[Darksonn]

Test panics can be due to your loom test doing something its not allowed to, or it may be a bug in loom. Your code is very large, so its not easy for me to tell which one is the case here. Perhaps you could create a MCVE that is easier to understand?

You might also want to check the other open issues for similar panics.