ICE when building a project after changing rustflags.

[xd009642]

So I found this while trying to solve a tarpaulin issue on a project where I'm not familiar with the code at all. The project is https://github.com/winksaville/rust-binance-auto-sell Using cargo 1.53.0-nightly (65d57e6f3 2021-04-04) my steps were:

cargo build 
`RUSTFLAGS=" -C link-dead-code -C debuginfo=2` cargo build

Tarpaulin changes the rustflags to add RUSTFLAGS=" -C link-dead-code -C debuginfo=2 hence the minimal instructions. This also doesn't happen in stable, instead I get this issue (rust-lang/cargo#9220). Also both stable and nightly work if started from a clean build

I'll try and look into the code to figure out a minimal reproducible example but like I said I'm not familiar at all with it at all. I'll also let a maintainer know about this and maybe they'll have a better idea.

Error output

I get a list of types that fills up my terminal I've attached it here:
output.txt

Backtrace

stack backtrace:
   0: rust_begin_unwind
             at /rustc/16bf626a31cb5b121d0bca2baa969b4f67eb0dab/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/16bf626a31cb5b121d0bca2baa969b4f67eb0dab/library/core/src/panicking.rs:92:14
   2: core::panicking::assert_failed_inner
   3: core::panicking::assert_failed
   4: rustc_query_system::query::plumbing::incremental_verify_ich
   5: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
   6: rustc_data_structures::stack::ensure_sufficient_stack
   7: rustc_query_system::query::plumbing::get_query_impl
   8: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::exported_symbols
   9: rustc_codegen_ssa::back::symbol_export::upstream_monomorphizations_provider
  10: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::upstream_monomorphizations>::compute
  11: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  12: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  13: rustc_data_structures::stack::ensure_sufficient_stack
  14: rustc_query_system::query::plumbing::get_query_impl
  15: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::upstream_monomorphizations
  16: rustc_codegen_ssa::back::symbol_export::upstream_monomorphizations_for_provider
  17: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  18: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  19: rustc_data_structures::stack::ensure_sufficient_stack
  20: rustc_query_system::query::plumbing::get_query_impl
  21: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::upstream_monomorphizations_for
  22: rustc_codegen_ssa::back::symbol_export::upstream_drop_glue_for_provider
  23: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  24: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  25: rustc_data_structures::stack::ensure_sufficient_stack
  26: rustc_query_system::query::plumbing::force_query_with_job
  27: rustc_query_system::query::plumbing::get_query_impl
  28: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::upstream_drop_glue_for
  29: rustc_middle::ty::instance::Instance::upstream_monomorphization
  30: rustc_mir::monomorphize::collector::should_codegen_locally
  31: <rustc_mir::monomorphize::collector::RootCollector as rustc_hir::itemlikevisit::ItemLikeVisitor>::visit_item
  32: rustc_hir::hir::Crate::visit_all_item_likes
  33: rustc_mir::monomorphize::collector::collect_roots
  34: rustc_mir::monomorphize::collector::collect_crate_mono_items
  35: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  36: rustc_query_impl::<impl rustc_query_system::query::config::QueryAccessors<rustc_query_impl::plumbing::QueryCtxt> for rustc_query_impl::queries::collect_and_partition_mono_items>::compute
  37: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  38: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  39: rustc_data_structures::stack::ensure_sufficient_stack
  40: rustc_query_system::query::plumbing::force_query_with_job
  41: rustc_query_system::query::plumbing::get_query_impl
  42: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::collect_and_partition_mono_items
  43: rustc_codegen_ssa::base::codegen_crate
  44: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  45: rustc_interface::passes::QueryContext::enter
  46: rustc_interface::queries::Queries::ongoing_codegen
  47: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  48: rustc_span::with_source_map
  49: rustc_interface::interface::create_compiler_and_run
  50: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

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 1.53.0-nightly (16bf626a3 2021-04-14) running on x86_64-unknown-linux-gnu

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

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

query stack during panic:
#0 [exported_symbols] exported_symbols
#1 [upstream_monomorphizations] collecting available upstream monomorphizations `crate0`
#2 [upstream_monomorphizations_for] collecting available upstream monomorphizations for `std::ptr::drop_in_place`
#3 [upstream_drop_glue_for] available upstream drop-glue for `[exchange_info::Symbol]`
#4 [collect_and_partition_mono_items] collect_and_partition_mono_items
end of query stack

[Aaron1011]

This will be fixed by #84226

[jyn514]

Fixed in #84226