Compiler panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/ty/query/mod.rs:235:5

[ch-sc]

I believe the compiler error started to occur after doing the following:
I added dependency lazy_static = "1.4.0" to cargo.toml and use its lazy_static macro in 2 files like shown in the code section of this bug report.

I can workaround the compiler error with cargo clean and then cargo build. Though, after a couple of builds the error re-emerges.

Code

lazy_static! {
    static ref COLOR_PATTERN: Regex = Regex::new(r"(\w* \w*) bag").unwrap();
    static ref QUANTITY_PATTERN: Regex = Regex::new(r"(\d*) (\w* \w*) bag").unwrap();
}

Meta

rustc --version --verbose:

rustc 1.50.0-nightly (3d6705aa5 2020-12-07)
binary: rustc
commit-hash: 3d6705aa5abffe94c83bf09af8c3ba3c599845fc
commit-date: 2020-12-07
host: x86_64-unknown-linux-gnu
release: 1.50.0-nightly

Error output

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/ty/query/mod.rs:235:5

Backtrace

stack backtrace:
   0:     0x7f3f8e0946a7 - std::backtrace_rs::backtrace::libunwind::trace::h746c3e9529d524bc
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x7f3f8e0946a7 - std::backtrace_rs::backtrace::trace_unsynchronized::h86340908ff889faa
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f3f8e0946a7 - std::sys_common::backtrace::_print_fmt::h43f85f9b18230404
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x7f3f8e0946a7 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hc132ae1a5b5aa7cd
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x7f3f8e10851c - core::fmt::write::hdf023a0036d2a25f
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/core/src/fmt/mod.rs:1078:17
   5:     0x7f3f8e086692 - std::io::Write::write_fmt::h8580846154bcb66a
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/io/mod.rs:1519:15
   6:     0x7f3f8e0983a5 - std::sys_common::backtrace::_print::h7ee55fed88d107a3
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x7f3f8e0983a5 - std::sys_common::backtrace::print::h54a7d3e52a524177
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x7f3f8e0983a5 - std::panicking::default_hook::{{closure}}::h60921e857bf55a40
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/panicking.rs:208:50
   9:     0x7f3f8e097efa - std::panicking::default_hook::hf0f9afb1017317fc
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/panicking.rs:225:9
  10:     0x7f3f8e94fa68 - rustc_driver::report_ice::hff78d76a39ffbb86
  11:     0x7f3f8e098ca6 - std::panicking::rust_panic_with_hook::h8d66bf42b407aaea
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/panicking.rs:595:17
  12:     0x7f3f8e098797 - std::panicking::begin_panic_handler::{{closure}}::hde71edcd925d0c5e
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/panicking.rs:495:13
  13:     0x7f3f8e094b6c - std::sys_common::backtrace::__rust_end_short_backtrace::h8a3c7d6cea578919
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/sys_common/backtrace.rs:141:18
  14:     0x7f3f8e098729 - rust_begin_unwind
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/panicking.rs:493:5
  15:     0x7f3f8e104931 - core::panicking::panic_fmt::h20225113c4a2f8fd
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/core/src/panicking.rs:92:14
  16:     0x7f3f8e10487d - core::panicking::panic::h35b77276aa4b0c12
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/core/src/panicking.rs:50:5
  17:     0x7f3f9132f835 - rustc_middle::ty::query::try_load_from_on_disk_cache::hfa4775df5c5e0180
  18:     0x7f3f9060a3ca - rustc_query_system::dep_graph::graph::DepGraph<K>::exec_cache_promotions::h8caa69177622351e
  19:     0x7f3f90622c21 - rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps::hab5675af7737b3e6
  20:     0x7f3f905c63bb - rustc_incremental::persist::save::save_in::h7f4f43356280dc0a
  21:     0x7f3f905c11d1 - rustc_data_structures::sync::join::h0120008f852881ce
  22:     0x7f3f90621cc2 - rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps::h2893ce60eec57bb6
  23:     0x7f3f905c58ef - rustc_incremental::persist::save::save_dep_graph::hffd3fb2ecc639a78
  24:     0x7f3f904a0daa - rustc_codegen_ssa::base::finalize_tcx::h68106e2729498b3e
  25:     0x7f3f8edbe457 - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h067fffb3870bc5b0
  26:     0x7f3f8eb6db2e - rustc_session::utils::<impl rustc_session::session::Session>::time::had158f21ec5bf4d1
  27:     0x7f3f8ebb082c - rustc_interface::passes::QueryContext::enter::h40067ad7feabcbd0
  28:     0x7f3f8ec08c93 - rustc_interface::queries::Queries::ongoing_codegen::h4fc36fc05972247d
  29:     0x7f3f8e8f86e2 - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::hd899306a06575d0c
  30:     0x7f3f8e98b7f7 - rustc_span::with_source_map::ha4e07ff263d0dc1d
  31:     0x7f3f8e8f988b - rustc_interface::interface::create_compiler_and_run::h1d6d732867d1f489
  32:     0x7f3f8e9a5d60 - scoped_tls::ScopedKey<T>::set::h39c0aa543118d3f3
  33:     0x7f3f8e9ac546 - std::sys_common::backtrace::__rust_begin_short_backtrace::h1e5aa72fb9cd6d86
  34:     0x7f3f8e90127a - core::ops::function::FnOnce::call_once{{vtable.shim}}::hc793837e985b77ce
  35:     0x7f3f8e0a865a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::hea1090dbdcecbf5a
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/alloc/src/boxed.rs:1328:9
  36:     0x7f3f8e0a865a - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8d5723d3912bd325
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/alloc/src/boxed.rs:1328:9
  37:     0x7f3f8e0a865a - std::sys::unix::thread::Thread::new::thread_start::hc17a425ca2995724
                               at /rustc/3d6705aa5abffe94c83bf09af8c3ba3c599845fc/library/std/src/sys/unix/thread.rs:71:17
  38:     0x7f3f8dfb5609 - start_thread
  39:     0x7f3f8dec9293 - clone
  40:                0x0 - <unknown>

[niklaslong]

I have encountered this error as well. I'm not sure what code might have triggered it (it happened right after the addition of a couple dbg! calls, though this was likely coincidental).

Meta

rustc --version --verbose:

rustc 1.50.0-nightly (3d6705aa5 2020-12-07)
binary: rustc
commit-hash: 3d6705aa5abffe94c83bf09af8c3ba3c599845fc
commit-date: 2020-12-07
host: x86_64-apple-darwin
release: 1.50.0-nightly

Error output

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', compiler/rustc_middle/src/ty/query/mod.rs:235:5

Backtrace with relevant notes

stack backtrace:
   0:        0x107dae1fc - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hddf67b5e68ee5eac
   1:        0x107e1599d - core::fmt::write::hae6418d3f135b639
   2:        0x107d9fe16 - std::io::Write::write_fmt::h822c37b1fbb805d3
   3:        0x107db1e79 - std::panicking::default_hook::{{closure}}::hb8c76ec6b2b5fec2
   4:        0x107db1a00 - std::panicking::default_hook::h9520f36dd50be056
   5:        0x10eac7468 - rustc_driver::report_ice::hab08807b07bece61
   6:        0x107db265e - std::panicking::rust_panic_with_hook::hbb70e1d25c7381a9
   7:        0x107db2139 - std::panicking::begin_panic_handler::{{closure}}::hb72eee9aad2e147c
   8:        0x107dae6b8 - std::sys_common::backtrace::__rust_end_short_backtrace::h372ff87ecb2667f3
   9:        0x107db20ca - _rust_begin_unwind
  10:        0x107e3cc1f - core::panicking::panic_fmt::h261fd45d36f74dfa
  11:        0x107e3cb77 - core::panicking::panic::hee3a097dbdc988d8
  12:        0x112b8c396 - rustc_middle::ty::query::try_load_from_on_disk_cache::h79b5afe1c2e80cd7
  13:        0x1120a5284 - rustc_query_system::dep_graph::graph::DepGraph<K>::exec_cache_promotions::h59848ff5959f2b25
  14:        0x1120ba598 - rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps::h6b0f4f58f3fe4fa5
  15:        0x112074663 - rustc_incremental::persist::save::save_in::h95c4af985c810672
  16:        0x11207055f - rustc_data_structures::sync::join::h28cbe6f4856b759a
  17:        0x1120b9f9d - rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps::h417a8e727abe81c6
  18:        0x112073707 - rustc_incremental::persist::save::save_dep_graph::h5168ffbb71fa5484
  19:        0x111f90893 - rustc_codegen_ssa::base::finalize_tcx::h27af4387e3fad8ad
  20:        0x10ee782c0 - <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate::h672987f7a5956f16
  21:        0x10ec89dad - rustc_session::utils::<impl rustc_session::session::Session>::time::hdde8570199d8b0d3
  22:        0x10ecc18e2 - rustc_interface::passes::QueryContext::enter::hd55f5917ee1869a7
  23:        0x10ed07690 - rustc_interface::queries::Queries::ongoing_codegen::hd9e56cbce1d99cdb
  24:        0x10ea79b6f - rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter::hb3cbdf40d2d583ab
  25:        0x10eaf73de - rustc_span::with_source_map::h4f73b4651f1d8670
  26:        0x10ea7aae4 - rustc_interface::interface::create_compiler_and_run::ha35d2af54e9355e8
  27:        0x10eb0d749 - scoped_tls::ScopedKey<T>::set::h8cb1fe74bd062a4c
  28:        0x10eb13b91 - std::sys_common::backtrace::__rust_begin_short_backtrace::h8e2469a9116ebf76
  29:        0x10ea821c9 - core::ops::function::FnOnce::call_once{{vtable.shim}}::hfc39034b1b021f49
  30:        0x107dbefdd - std::sys::unix::thread::Thread::new::thread_start::h93dd3097fa4fa219
  31:     0x7fff6d53a109 - __pthread_start

error: internal compiler error: unexpected panic

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

note: rustc 1.50.0-nightly (3d6705aa5 2020-12-07) running on x86_64-apple-darwin

note: compiler flags: -C linker-plugin-lto -C debuginfo=2 -C incremental -C target-cpu=native --crate-type lib

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack

[jyn514]

Duplicate of #79661, this should be fixed on the latest nightly.