Internal compiler error with Rust 1.33.0

[leenozara]

Hi @mehcode I'm getting a compiler error since the latest Rust 1.33.0 nightly.

Error:

error: internal compiler error: src/librustc_mir/monomorphize/collector.rs:747: Cannot create local mono-item for DefId(45/0:303 ~ config[fd64]::file[0]::{{impl}}[1]::with_name[0])

To reproduce:

git clone https://github.com/riker-rs/riker.git
git checkout r2018
cargo build

This error is caused by this line in src/lib.rs:

cfg.merge(File::with_name(&format!("{}", path)).required(false)).unwrap();

It seems that specifically File::with_name causes the compiler error. I've tried both versions 0.8 and 0.9 of Config.

There was no error a few days ago before Rust 1.33.0.

Backtrace

``` thread 'rustc' panicked at 'Box', src/librustc_errors/lib.rs:590:9 stack backtrace: 0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39 1: std::sys_common::backtrace::_print at src/libstd/sys_common/backtrace.rs:70 2: std::panicking::default_hook::{{closure}} at src/libstd/sys_common/backtrace.rs:58 at src/libstd/panicking.rs:200 3: std::panicking::default_hook at src/libstd/panicking.rs:215 4: rustc::util::common::panic_hook 5: std::panicking::rust_panic_with_hook at src/libstd/panicking.rs:482 6: std::panicking::begin_panic 7: rustc_errors::Handler::bug 8: rustc::util::bug::opt_span_bug_fmt::{{closure}} 9: rustc::ty::context::tls::with_opt::{{closure}} 10: rustc::ty::context::tls::with_context_opt 11: rustc::ty::context::tls::with_opt 12: rustc::util::bug::opt_span_bug_fmt 13: rustc::util::bug::bug_fmt 14: rustc_mir::monomorphize::collector::should_monomorphize_locally 15: rustc_mir::monomorphize::collector::visit_instance_use 16: as rustc::mir::visit::Visitor<'tcx>>::visit_terminator_kind 17: rustc_mir::monomorphize::collector::collect_items_rec 18: rustc_mir::monomorphize::collector::collect_crate_mono_items::{{closure}} 19: rustc::util::common::time 20: rustc_mir::monomorphize::collector::collect_crate_mono_items 21: rustc::util::common::time 22: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items 23: rustc::ty::query::__query_compute::collect_and_partition_mono_items 24: rustc::ty::query:: for rustc::ty::query::queries::collect_and_partition_mono_items<'tcx>>::compute 25: rustc::dep_graph::graph::DepGraph::with_task_impl 26: >::start 27: rustc::ty::query::plumbing::>::force_query_with_job 28: rustc::ty::query::plumbing::>::try_get_with 29: rustc_codegen_ssa::back::symbol_export::exported_symbols_provider_local 30: rustc::ty::query::__query_compute::exported_symbols 31: rustc::ty::query:: for rustc::ty::query::queries::exported_symbols<'tcx>>::compute 32: rustc::dep_graph::graph::DepGraph::with_task_impl 33: >::start 34: rustc::ty::query::plumbing::>::force_query_with_job 35: rustc::ty::query::plumbing::>::try_get_with 36: rustc_metadata::encoder::encode_metadata 37: rustc_metadata::cstore_impl::::encode_metadata 38: rustc::ty::context::TyCtxt::encode_metadata 39: ::write_metadata 40: rustc::util::common::time 41: rustc_codegen_ssa::base::codegen_crate 42: ::codegen_crate 43: rustc_driver::driver::phase_4_codegen 44: rustc_driver::driver::compile_input::{{closure}} 45: >::with 46: rustc::ty::context::TyCtxt::create_and_enter 47: rustc_driver::driver::compile_input 48: rustc_driver::run_compiler_with_pool 49: >::set 50: rustc_driver::run_compiler 51: >::set 52: syntax::with_globals 53: __rust_maybe_catch_panic at src/libpanic_unwind/lib.rs:92 54: >::call_box 55: std::sys::unix::thread::Thread::new::thread_start at /rustc/b2b7a063af39455d7362524da3123c34c3f4842e/src/liballoc/boxed.rs:734 at src/libstd/sys_common/thread.rs:14 at src/libstd/sys/unix/thread.rs:81 56: start_thread 57: clone query stack during panic: #0 [collect_and_partition_mono_items] collect_and_partition_mono_items #1 [exported_symbols] exported_symbols end of query stack error: aborting due to previous error

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.33.0-nightly (b2b7a063a 2019-01-01) 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

error: Could not compile riker.

</p>
</details>

[mehcode]

Thanks for reporting. This should be fixed now. Apparently I was accidentally relying on some UB for monomorphic expansion.