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ICE:assertion failed: body.yield_ty.is_some() && universal_regions.yield_ty.is_some() || body.yield_ty.is_none() && universal_regions.yield_ty.is_none() #78336
Description
Code
fn finds_explicit_bound<'b>() -> impl 'b {
yield
}Meta
rustc --version --verbose:
rustc 1.49.0-nightly (7bade6ef7 2020-10-23)
binary: rustc
commit-hash: 7bade6ef730cff83f3591479a98916920f66decd
commit-date: 2020-10-23
host: x86_64-unknown-linux-gnu
release: 1.49.0-nightly
LLVM version: 11.0
Error output
error: at least one trait must be specified
--> reduced_mutant.rs:1:34
|
1 | fn finds_explicit_bound<'b>() -> impl 'b {
| ^^^^^^^
error[E0658]: yield syntax is experimental
--> reduced_mutant.rs:2:5
|
2 | yield
| ^^^^^
|
= note: see issue #43122 <https://github.com/rust-lang/rust/issues/43122> for more information
= help: add `#![feature(generators)]` to the crate attributes to enable
error[E0601]: `main` function not found in crate `reduced_mutant`
--> reduced_mutant.rs:1:1
|
1 | / fn finds_explicit_bound<'b>() -> impl 'b {
2 | | yield
3 | | }
| |_^ consider adding a `main` function to `reduced_mutant.rs`
error[E0627]: yield expression outside of generator literal
--> reduced_mutant.rs:2:5
|
2 | yield
| ^^^^^
thread 'rustc' panicked at 'assertion failed: body.yield_ty.is_some() && universal_regions.yield_ty.is_some() ||
body.yield_ty.is_none() && universal_regions.yield_ty.is_none()', compiler/rustc_mir/src/borrow_check/type_check/input_output.rs:110:9
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 1.49.0-nightly (7bade6ef7 2020-10-23) running on x86_64-unknown-linux-gnu
query stack during panic:
#0 [mir_borrowck] borrow-checking `finds_explicit_bound`
#1 [type_of] computing type of `finds_explicit_bound::{opaque#0}`
end of query stack
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0601, E0627, E0658.
For more information about an error, try `rustc --explain E0601`.
Backtrace
thread 'rustc' panicked at 'assertion failed: body.yield_ty.is_some() && universal_regions.yield_ty.is_some() ||
body.yield_ty.is_none() && universal_regions.yield_ty.is_none()', compiler/rustc_mir/src/borrow_check/type_check/input_output.rs:110:9
stack backtrace:
0: std::panicking::begin_panic
1: rustc_mir::borrow_check::type_check::type_check
2: rustc_mir::borrow_check::nll::compute_regions
3: rustc_mir::borrow_check::do_mir_borrowck
4: rustc_infer::infer::InferCtxtBuilder::enter
5: rustc_mir::borrow_check::mir_borrowck
6: core::ops::function::FnOnce::call_once
7: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::mir_borrowck>::compute
8: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
9: rustc_data_structures::stack::ensure_sufficient_stack
10: rustc_query_system::query::plumbing::get_query_impl
11: rustc_typeck::collect::type_of::type_of
12: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::type_of>::compute
13: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
14: rustc_data_structures::stack::ensure_sufficient_stack
15: rustc_query_system::query::plumbing::get_query_impl
16: rustc_typeck::check::check::check_item_type
17: rustc_middle::hir::map::Map::visit_item_likes_in_module
18: rustc_typeck::check::check::check_mod_item_types
19: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::check_mod_item_types>::compute
20: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
21: rustc_data_structures::stack::ensure_sufficient_stack
22: rustc_query_system::query::plumbing::get_query_impl
23: rustc_query_system::query::plumbing::ensure_query_impl
24: rustc_session::utils::<impl rustc_session::session::Session>::time
25: rustc_typeck::check_crate
26: rustc_interface::passes::analysis
27: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
28: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
29: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
30: rustc_query_system::query::plumbing::get_query_impl
31: rustc_interface::passes::QueryContext::enter
32: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
33: rustc_span::with_source_map
34: rustc_interface::interface::create_compiler_and_run
35: scoped_tls::ScopedKey<T>::set
NOTE: The bug is found by our work-in-progress compiler testing tool Kira, and the test program is reduced/minimized by Perses
Activity
camelid commentedon Oct 24, 2020
camelid commentedon Oct 24, 2020
Assigning
P-mediumand removingI-prioritizeas discussed in the prioritization working group.JohnTitor commentedon Oct 25, 2020
I think it's related to #67681, cc @matthewjasper.
matthiaskrgr commentedon Dec 20, 2020
@rustbot modify labels: +regression-from-stable-to-stable
Alexendoo commentedon Dec 5, 2021
Fixed by #91488