cargo test panics: no MIR available for DefId

[rMazeiks]

Edit: added reproducible example

Code

This is a minimal (i think) example of a crate that makes Cargo panic.

lib.rs:

mod inner {
    pub struct conflict;

    impl conflict {
        pub fn do_stuff(&self) {}
    }
}
mod conflict {}

pub use inner::*;

examples/example.rs

fn main() {
    dioxus::conflict.do_stuff();
}

Test or run the example to get the panic:

# cargo panics:
cargo test

# or
cargo run --example example

Meta

Reproduced on both stable and nightly. I'm on linux but CI tells me this also occurs on Windows and MacOS.

rustc --version --verbose:

rustc 1.60.0 (7737e0b5c 2022-04-04)
binary: rustc
commit-hash: 7737e0b5c4103216d6fd8cf941b7ab9bdbaace7c
commit-date: 2022-04-04
host: x86_64-unknown-linux-gnu
release: 1.60.0
LLVM version: 14.0.0

rustc 1.62.0-nightly (ecd44958e 2022-05-10)
binary: rustc
commit-hash: ecd44958e0a21110d09862ee080d95a4ca6c52f8
commit-date: 2022-05-10
host: x86_64-unknown-linux-gnu
release: 1.62.0-nightly
LLVM version: 14.0.1

Error output

error: internal compiler error: compiler/rustc_monomorphize/src/collector.rs:993:9: no MIR available for DefId(20:7 ~ dioxus[5642]::inner::{impl#0}::do_stuff)

Backtrace

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/compiler/rustc_errors/src/lib.rs:1335:9
stack backtrace:
   0:     0x7f9fa9915e7d - std::backtrace_rs::backtrace::libunwind::trace::h85cc47332f2b05a9
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f9fa9915e7d - std::backtrace_rs::backtrace::trace_unsynchronized::h822c2fc2b1a1a752
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f9fa9915e7d - std::sys_common::backtrace::_print_fmt::h678c9b8abf6c5083
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f9fa9915e7d - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h2fb21895faf729c2
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f9fa9971afc - core::fmt::write::h6dc4a63f2d3360d8
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/core/src/fmt/mod.rs:1196:17
   5:     0x7f9fa9907561 - std::io::Write::write_fmt::h8fe2d520dd3fbf2e
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/io/mod.rs:1654:15
   6:     0x7f9fa9918b95 - std::sys_common::backtrace::_print::h6c3478d5fa62e7d8
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f9fa9918b95 - std::sys_common::backtrace::print::hd6d4473e0c0113a9
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f9fa9918b95 - std::panicking::default_hook::{{closure}}::h4dec78d051eecf7c
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/panicking.rs:295:22
   9:     0x7f9fa9918809 - std::panicking::default_hook::hc13b58dcc91e88ba
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/panicking.rs:314:9
  10:     0x7f9faa0dab21 - rustc_driver[d4386f1a79afc323]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f9fa9919366 - std::panicking::rust_panic_with_hook::h3dd403ae323eac6a
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/panicking.rs:702:17
  12:     0x7f9fab162781 - std[d9fedb1e1dbc9663]::panicking::begin_panic::<rustc_errors[b91ec0213766c8bc]::ExplicitBug>::{closure#0}
  13:     0x7f9fab15cc56 - std[d9fedb1e1dbc9663]::sys_common::backtrace::__rust_end_short_backtrace::<std[d9fedb1e1dbc9663]::panicking::begin_panic<rustc_errors[b91ec0213766c8bc]::ExplicitBug>::{closure#0}, !>
  14:     0x7f9fab0f3756 - std[d9fedb1e1dbc9663]::panicking::begin_panic::<rustc_errors[b91ec0213766c8bc]::ExplicitBug>
  15:     0x7f9fab1206f6 - std[d9fedb1e1dbc9663]::panic::panic_any::<rustc_errors[b91ec0213766c8bc]::ExplicitBug>
  16:     0x7f9fab115515 - <rustc_errors[b91ec0213766c8bc]::HandlerInner>::bug::<&alloc[4e51958440f9dea6]::string::String>
  17:     0x7f9fab115080 - <rustc_errors[b91ec0213766c8bc]::Handler>::bug::<&alloc[4e51958440f9dea6]::string::String>
  18:     0x7f9fab16b07d - rustc_middle[7208bd69784e7596]::ty::context::tls::with_opt::<rustc_middle[7208bd69784e7596]::util::bug::opt_span_bug_fmt<rustc_span[5ada1bf86533b524]::span_encoding::Span>::{closure#0}, ()>
  19:     0x7f9fab16b3f6 - rustc_middle[7208bd69784e7596]::util::bug::opt_span_bug_fmt::<rustc_span[5ada1bf86533b524]::span_encoding::Span>
  20:     0x7f9fab16b373 - rustc_middle[7208bd69784e7596]::util::bug::bug_fmt
  21:     0x7f9fab4a1880 - rustc_monomorphize[666faa1c7ca59088]::collector::collect_neighbours
  22:     0x7f9fab4992c2 - rustc_monomorphize[666faa1c7ca59088]::collector::collect_items_rec
  23:     0x7f9fac2e304b - <rustc_session[93b3d23ec172418c]::session::Session>::time::<(), rustc_monomorphize[666faa1c7ca59088]::collector::collect_crate_mono_items::{closure#1}>
  24:     0x7f9fac2d7fcb - rustc_monomorphize[666faa1c7ca59088]::collector::collect_crate_mono_items
  25:     0x7f9fac2dec76 - rustc_monomorphize[666faa1c7ca59088]::partitioning::collect_and_partition_mono_items
  26:     0x7f9faa9c0a48 - <rustc_middle[7208bd69784e7596]::dep_graph::dep_node::DepKind as rustc_query_system[d391a3ff2bd3fbc4]::dep_graph::DepKind>::with_deps::<<rustc_query_system[d391a3ff2bd3fbc4]::dep_graph::graph::DepGraph<rustc_middle[7208bd69784e7596]::dep_graph::dep_node::DepKind>>::with_task_impl<rustc_middle[7208bd69784e7596]::ty::context::TyCtxt, (), (&std[d9fedb1e1dbc9663]::collections::hash::set::HashSet<rustc_span[5ada1bf86533b524]::def_id::DefId, core[9ba3ef39911e8828]::hash::BuildHasherDefault<rustc_hash[6e272a3b223b8a2c]::FxHasher>>, &[rustc_middle[7208bd69784e7596]::mir::mono::CodegenUnit])>::{closure#0}, (&std[d9fedb1e1dbc9663]::collections::hash::set::HashSet<rustc_span[5ada1bf86533b524]::def_id::DefId, core[9ba3ef39911e8828]::hash::BuildHasherDefault<rustc_hash[6e272a3b223b8a2c]::FxHasher>>, &[rustc_middle[7208bd69784e7596]::mir::mono::CodegenUnit])>
  27:     0x7f9faaa37ae1 - <rustc_query_system[d391a3ff2bd3fbc4]::dep_graph::graph::DepGraph<rustc_middle[7208bd69784e7596]::dep_graph::dep_node::DepKind>>::with_task::<rustc_middle[7208bd69784e7596]::ty::context::TyCtxt, (), (&std[d9fedb1e1dbc9663]::collections::hash::set::HashSet<rustc_span[5ada1bf86533b524]::def_id::DefId, core[9ba3ef39911e8828]::hash::BuildHasherDefault<rustc_hash[6e272a3b223b8a2c]::FxHasher>>, &[rustc_middle[7208bd69784e7596]::mir::mono::CodegenUnit])>
  28:     0x7f9fac6da85c - rustc_query_system[d391a3ff2bd3fbc4]::query::plumbing::try_execute_query::<rustc_query_impl[d4cc4f0a253379a9]::plumbing::QueryCtxt, rustc_query_system[d391a3ff2bd3fbc4]::query::caches::DefaultCache<(), (&std[d9fedb1e1dbc9663]::collections::hash::set::HashSet<rustc_span[5ada1bf86533b524]::def_id::DefId, core[9ba3ef39911e8828]::hash::BuildHasherDefault<rustc_hash[6e272a3b223b8a2c]::FxHasher>>, &[rustc_middle[7208bd69784e7596]::mir::mono::CodegenUnit])>>
  29:     0x7f9fac70fc00 - rustc_query_system[d391a3ff2bd3fbc4]::query::plumbing::get_query::<rustc_query_impl[d4cc4f0a253379a9]::queries::collect_and_partition_mono_items, rustc_query_impl[d4cc4f0a253379a9]::plumbing::QueryCtxt>
  30:     0x7f9fac65b7d2 - <rustc_query_impl[d4cc4f0a253379a9]::Queries as rustc_middle[7208bd69784e7596]::ty::query::QueryEngine>::collect_and_partition_mono_items
  31:     0x7f9fac1c4b84 - rustc_codegen_ssa[afbe1fd0376e08de]::base::codegen_crate::<rustc_codegen_llvm[53437695cdd61ca1]::LlvmCodegenBackend>
  32:     0x7f9fac1b1043 - <rustc_codegen_llvm[53437695cdd61ca1]::LlvmCodegenBackend as rustc_codegen_ssa[afbe1fd0376e08de]::traits::backend::CodegenBackend>::codegen_crate
  33:     0x7f9fac1787d7 - <rustc_session[93b3d23ec172418c]::session::Session>::time::<alloc[4e51958440f9dea6]::boxed::Box<dyn core[9ba3ef39911e8828]::any::Any>, rustc_interface[50aa842067ddf2a9]::passes::start_codegen::{closure#0}>
  34:     0x7f9fac175b2c - <rustc_interface[50aa842067ddf2a9]::passes::QueryContext>::enter::<<rustc_interface[50aa842067ddf2a9]::queries::Queries>::ongoing_codegen::{closure#0}::{closure#0}, core[9ba3ef39911e8828]::result::Result<alloc[4e51958440f9dea6]::boxed::Box<dyn core[9ba3ef39911e8828]::any::Any>, rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>>
  35:     0x7f9fac19ab2f - <rustc_interface[50aa842067ddf2a9]::queries::Queries>::ongoing_codegen
  36:     0x7f9fac142beb - <rustc_interface[50aa842067ddf2a9]::interface::Compiler>::enter::<rustc_driver[d4386f1a79afc323]::run_compiler::{closure#1}::{closure#2}, core[9ba3ef39911e8828]::result::Result<core[9ba3ef39911e8828]::option::Option<rustc_interface[50aa842067ddf2a9]::queries::Linker>, rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>>
  37:     0x7f9fac16af4f - rustc_span[5ada1bf86533b524]::with_source_map::<core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>, rustc_interface[50aa842067ddf2a9]::interface::create_compiler_and_run<core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>, rustc_driver[d4386f1a79afc323]::run_compiler::{closure#1}>::{closure#1}>
  38:     0x7f9fac143824 - rustc_interface[50aa842067ddf2a9]::interface::create_compiler_and_run::<core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>, rustc_driver[d4386f1a79afc323]::run_compiler::{closure#1}>
  39:     0x7f9fac1410d2 - <scoped_tls[48edcdfa9356486f]::ScopedKey<rustc_span[5ada1bf86533b524]::SessionGlobals>>::set::<rustc_interface[50aa842067ddf2a9]::interface::run_compiler<core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>, rustc_driver[d4386f1a79afc323]::run_compiler::{closure#1}>::{closure#0}, core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>>
  40:     0x7f9fac1581ef - std[d9fedb1e1dbc9663]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[50aa842067ddf2a9]::util::run_in_thread_pool_with_globals<rustc_interface[50aa842067ddf2a9]::interface::run_compiler<core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>, rustc_driver[d4386f1a79afc323]::run_compiler::{closure#1}>::{closure#0}, core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>>::{closure#0}, core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>>
  41:     0x7f9fac158329 - <<std[d9fedb1e1dbc9663]::thread::Builder>::spawn_unchecked_<rustc_interface[50aa842067ddf2a9]::util::run_in_thread_pool_with_globals<rustc_interface[50aa842067ddf2a9]::interface::run_compiler<core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>, rustc_driver[d4386f1a79afc323]::run_compiler::{closure#1}>::{closure#0}, core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>>::{closure#0}, core[9ba3ef39911e8828]::result::Result<(), rustc_errors[b91ec0213766c8bc]::ErrorGuaranteed>>::{closure#1} as core[9ba3ef39911e8828]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  42:     0x7f9fa9923273 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h8e61158325523155
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/alloc/src/boxed.rs:1872:9
  43:     0x7f9fa9923273 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::ha439966d612c01d5
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/alloc/src/boxed.rs:1872:9
  44:     0x7f9fa9923273 - std::sys::unix::thread::Thread::new::thread_start::hf215f8619fb489d4
                               at /rustc/ecd44958e0a21110d09862ee080d95a4ca6c52f8/library/std/src/sys/unix/thread.rs:108:17
  45:     0x7f9fa9841609 - start_thread
                               at /build/glibc-sMfBJT/glibc-2.31/nptl/pthread_create.c:477:8
  46:     0x7f9fa975a163 - clone
  47:                0x0 - <unknown>

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

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.62.0-nightly (ecd44958e 2022-05-10) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type bin -C embed-bitcode=no -C debuginfo=2 -C incremental

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

query stack during panic:
#0 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack
error: could not compile `dioxus`
warning: build failed, waiting for other jobs to finish...
warning: `dioxus` (lib test) generated 2 warnings (2 duplicates)

[rMazeiks]

I managed to make a small reproducible example!

I've now added it above.