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@alexreg alexreg/a
Created Jan 25, 2019

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$ RUST_BACKTRACE=1 build/x86_64-apple-darwin/stage2/bin/rustc atb.rs -Ztreat-err-as-bug
warning: unused import: `Display`
--> atb.rs:4:23
|
4 | use std::fmt::{Debug, Display};
| ^^^^^^^
|
= note: #[warn(unused_imports)] on by default
error[E0271]: type mismatch resolving `<i32 as TraitB>::AssocB == impl std::marker::Send`
--> atb.rs:37:1
|
37 | existential type Bar: Debug + TraitB<AssocB = impl Send>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected u32, found opaque type
|
= note: expected type `u32`
found type `impl std::marker::Send`
= note: the return type of a function must have a statically known size
thread 'rustc' panicked at 'encountered error with `-Z treat_err_as_bug', src/librustc_errors/lib.rs:490:13
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
1: std::sys_common::backtrace::print
2: std::panicking::default_hook::{{closure}}
3: std::panicking::default_hook
4: rustc::util::common::panic_hook
5: std::panicking::rust_panic_with_hook
6: std::panicking::begin_panic
7: rustc_errors::Handler::emit_db
8: rustc_errors::diagnostic_builder::DiagnosticBuilder::emit
9: rustc::infer::InferCtxt::probe
10: rustc::traits::error_reporting::<impl rustc::infer::InferCtxt<'a, 'gcx, 'tcx>>::report_fulfillment_errors
11: rustc_typeck::check::FnCtxt::select_obligations_where_possible
12: rustc_typeck::check::FnCtxt::resolve_type_vars_with_obligations
13: rustc_typeck::check::coercion::<impl rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx>>::try_coerce
14: <rustc_typeck::check::coercion::CoerceMany<'gcx, 'tcx, 'exprs, E>>::coerce_inner
15: rustc_typeck::check::FnCtxt::check_return_expr
16: rustc_typeck::check::check_fn
17: rustc::ty::context::GlobalCtxt::enter_local
18: rustc_typeck::check::typeck_tables_of
19: rustc::ty::query::__query_compute::typeck_tables_of
20: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::typeck_tables_of<'tcx>>::compute
21: rustc::dep_graph::graph::DepGraph::with_task_impl
22: <rustc::ty::query::plumbing::JobOwner<'a, 'tcx, Q>>::start
23: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
24: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_get_with
25: rustc_typeck::collect::find_existential_constraints::ConstraintLocator::check
26: rustc::hir::intravisit::Visitor::visit_nested_item
27: rustc_typeck::collect::find_existential_constraints
28: rustc_typeck::collect::type_of
29: rustc::ty::query::__query_compute::type_of
30: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::type_of<'tcx>>::compute
31: rustc::dep_graph::graph::DepGraph::with_task_impl
32: <rustc::ty::query::plumbing::JobOwner<'a, 'tcx, Q>>::start
33: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
34: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::try_get_with
35: <rustc_typeck::collect::CollectItemTypesVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_item
36: rustc::hir::Crate::visit_all_item_likes
37: rustc::util::common::time
38: rustc_typeck::check_crate
39: <std::thread::local::LocalKey<T>>::with
40: rustc::ty::context::TyCtxt::create_and_enter
41: rustc_driver::driver::phase_3_run_analysis_passes
42: rustc_driver::driver::compile_input
43: rustc_driver::run_compiler_with_pool
44: <scoped_tls::ScopedKey<T>>::set
45: rustc_driver::run_compiler
46: <scoped_tls::ScopedKey<T>>::set
BT ERR: Ok(())
query stack during panic:
#0 [typeck_tables_of] processing `a`
#1 [type_of] processing `Bar`
end of query stack
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/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.33.0-dev running on x86_64-apple-darwin
note: compiler flags: -Z treat-err-as-bug
!101
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