Repository: rust
Issue: 'rustc' panicked at 'Found unstable fingerprints for evaluate_obligation(afe5a72796064009-bb93b44d6fc03c8c): Ok(EvaluatedToOkModuloRegions)'
Labels: I-ICE,T-compiler,A-incr-comp,C-bug

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### Code

`Cargo.toml`:
```TOML
[package]
name = "famnm-website-backend"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
tokio = { version = "1.12.0", features = ["full"] }
warp = "0.3.1"
```

`src/main.rs`:
```Rust
use warp::Filter;

mod api;

#[tokio::main]
async fn main() {
    let any = warp::any().map(api::hello_world);

    warp::serve(any).run(([127, 0, 0, 1], 8000)).await;
}
```

`src/api.rs`:
```Rust
pub fn hello_world() -> String {
    String::from("Hello, world!")
}
```

`Cargo.lock`:
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# It is not intended for manual editing.
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```


### Meta
<!--
If you're using the stable version of the compiler, you should also check if the
bug also exists in the beta or nightly versions.
-->

`rustc --version --verbose`:
```
rustc 1.56.0 (09c42c458 2021-10-18)
binary: rustc
commit-hash: 09c42c45858d5f3aedfa670698275303a3d19afa
commit-date: 2021-10-18
host: x86_64-apple-darwin
release: 1.56.0
LLVM version: 13.0.0
```

### Error output

```
error: internal compiler error: encountered incremental compilation error with evaluate_obligation(afe5a72796064009-bb93b44d6fc03c8c)
  |
  = help: This is a known issue with the compiler. Run `cargo clean -p famnm_website_backend` or `cargo clean` to allow your project to compile
  = note: Please follow the instructions below to create a bug report with the provided information
  = note: See <https://github.com/rust-lang/rust/issues/84970> for more information

thread 'rustc' panicked at 'Found unstable fingerprints for evaluate_obligation(afe5a72796064009-bb93b44d6fc03c8c): Ok(EvaluatedToOkModuloRegions)', /rustc/09c42c45858d5f3aedfa670698275303a3d19afa/compiler/rustc_query_system/src/query/plumbing.rs:644:13
note: run with `RUST_BACKTRACE=1` environment variable to display a 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 1.56.0 (09c42c458 2021-10-18) running on x86_64-apple-darwin

note: compiler flags: -C embed-bitcode=no -C split-debuginfo=unpacked -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
#0 [evaluate_obligation] evaluating trait selection obligation `warp::hyper::proto::h1::dispatch::Server<warp::hyper::service::util::ServiceFn<[closure@warp::Server<warp::filter::map::Map<warp::filters::any::Any, fn() -> std::string::String {api::hello_world}>>::bind_ephemeral<([u8; 4], u16)>::{closure#1}::{closure#0}::{closure#0}], warp::hyper::Body>, warp::hyper::Body>: std::marker::Send`
#1 [normalize_projection_ty] normalizing `Canonical { max_universe: U0, variables: [], value: ParamEnvAnd { param_env: ParamEnv { caller_bounds: [], reveal: All }, value: ProjectionTy { substs: [warp::hyper::Server<warp::hyper::server::conn::AddrIncoming, warp::hyper::service::make::MakeServiceFn<[closure@warp::Server<warp::filter::map::Map<warp::filters::any::Any, fn() -> std::string::String {api::hello_world}>>::bind_ephemeral<([u8; 4], u16)>::{closure#1}::{closure#0}]>>], item_def_id: DefId(2:12563 ~ core[e105]::future::future::Future::Output) } } }`
end of query stack
error: could not compile `famnm-website-backend` due to previous error
```

<!--
Include a backtrace in the code block by setting `RUST_BACKTRACE=1` in your
environment. E.g. `RUST_BACKTRACE=1 cargo build`.
-->
<details><summary><strong>Backtrace</strong></summary>
<p>

```
stack backtrace:
   0: _rust_begin_unwind
   1: std::panicking::begin_panic_fmt
   2: rustc_query_system::query::plumbing::incremental_verify_ich
   3: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
   4: rustc_data_structures::stack::ensure_sufficient_stack
   5: rustc_query_system::query::plumbing::get_query_impl
   6: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::evaluate_obligation
   7: <rustc_infer::infer::InferCtxt as rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation
   8: <rustc_infer::infer::InferCtxt as rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt>::evaluate_obligation_no_overflow
   9: rustc_trait_selection::traits::fulfill::FulfillProcessor::process_trait_obligation
  10: rustc_trait_selection::traits::fulfill::FulfillProcessor::progress_changed_obligations
  11: rustc_data_structures::obligation_forest::ObligationForest<O>::process_obligations
  12: rustc_trait_selection::traits::fulfill::FulfillmentContext::select
  13: <rustc_trait_selection::traits::fulfill::FulfillmentContext as rustc_infer::traits::engine::TraitEngine>::select_where_possible
  14: <rustc_infer::infer::InferCtxtBuilder as rustc_trait_selection::infer::InferCtxtBuilderExt>::enter_canonical_trait_query
  15: rustc_traits::normalize_projection_ty::normalize_projection_ty
  16: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  17: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  18: rustc_data_structures::stack::ensure_sufficient_stack
  19: rustc_query_system::query::plumbing::get_query_impl
  20: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::normalize_projection_ty
  21: <rustc_trait_selection::traits::query::normalize::QueryNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_ty
  22: rustc_middle::ty::subst::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::list::List<rustc_middle::ty::subst::GenericArg>>::super_fold_with
  23: rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::TyS>::super_fold_with
  24: <rustc_trait_selection::traits::query::normalize::QueryNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_ty
  25: <rustc_infer::infer::at::At as rustc_trait_selection::traits::query::normalize::AtExt>::normalize
  26: rustc_infer::infer::InferCtxtBuilder::enter
  27: core::ops::function::FnOnce::call_once
  28: rustc_middle::dep_graph::<impl rustc_query_system::dep_graph::DepKind for rustc_middle::dep_graph::dep_node::DepKind>::with_deps
  29: rustc_query_system::query::plumbing::load_from_disk_and_cache_in_memory
  30: rustc_data_structures::stack::ensure_sufficient_stack
  31: rustc_query_system::query::plumbing::get_query_impl
  32: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::normalize_generic_arg_after_erasing_regions
  33: rustc_middle::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder::normalize_generic_arg_after_erasing_regions
  34: <rustc_middle::ty::normalize_erasing_regions::NormalizeAfterErasingRegionsFolder as rustc_middle::ty::fold::TypeFolder>::fold_ty
  35: <rustc_mir::monomorphize::collector::MirNeighborCollector as rustc_middle::mir::visit::Visitor>::visit_terminator
  36: rustc_mir::monomorphize::collector::collect_neighbours
  37: rustc_mir::monomorphize::collector::collect_items_rec
  38: rustc_mir::monomorphize::collector::collect_items_rec
  39: rustc_mir::monomorphize::collector::collect_items_rec
  40: rustc_mir::monomorphize::collector::collect_items_rec
  41: rustc_mir::monomorphize::collector::collect_items_rec
  42: rustc_mir::monomorphize::collector::collect_items_rec
  43: rustc_mir::monomorphize::collector::collect_items_rec
  44: rustc_mir::monomorphize::collector::collect_items_rec
  45: rustc_mir::monomorphize::collector::collect_items_rec
  46: rustc_mir::monomorphize::collector::collect_items_rec
  47: rustc_mir::monomorphize::collector::collect_items_rec
  48: rustc_mir::monomorphize::collector::collect_items_rec
  49: rustc_mir::monomorphize::collector::collect_items_rec
  50: rustc_mir::monomorphize::collector::collect_items_rec
  51: rustc_mir::monomorphize::collector::collect_items_rec
  52: rustc_mir::monomorphize::collector::collect_items_rec
  53: rustc_mir::monomorphize::collector::collect_items_rec
  54: rustc_mir::monomorphize::collector::collect_items_rec
  55: rustc_session::utils::<impl rustc_session::session::Session>::time
  56: rustc_mir::monomorphize::collector::collect_crate_mono_items
  57: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  58: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
  59: rustc_data_structures::stack::ensure_sufficient_stack
  60: rustc_query_system::query::plumbing::force_query_with_job
  61: rustc_query_system::query::plumbing::get_query_impl
  62: <rustc_query_impl::Queries as rustc_middle::ty::query::QueryEngine>::collect_and_partition_mono_items
  63: rustc_codegen_ssa::base::codegen_crate
  64: <rustc_codegen_llvm::LlvmCodegenBackend as rustc_codegen_ssa::traits::backend::CodegenBackend>::codegen_crate
  65: rustc_interface::queries::Queries::ongoing_codegen
  66: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  67: rustc_span::with_source_map
  68: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
```

</p>
</details>