Closed
Description
The following code ICE's on beta and nightly, (notice how I DIDN'T use the ``#![feature(const_if_match)]` feature)
struct Bug {
inner: [(); match || {1} {
n => n(),
}],
}Backtrace:
Compiling playground v0.0.1 (/playground)
error[E0658]: `match` is not allowed in a `const`
--> src/lib.rs:2:17
|
2 | inner: [(); match || {1} {
| _________________^
3 | | n => n(),
4 | | }],
| |_____^
|
= note: for more information, see https://github.com/rust-lang/rust/issues/49146
= help: add `#![feature(const_if_match)]` to the crate attributes to enable
error[E0015]: calls in constants are limited to constant functions, tuple structs and tuple variants
--> src/lib.rs:3:14
|
3 | n => n(),
| ^^^
error: internal compiler error: src/librustc_typeck/collect.rs:1869: to get the signature of a closure, use `closure_sig()` not `fn_sig()`
thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:892:9
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:84
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:61
4: core::fmt::write
at src/libcore/fmt/mod.rs:1025
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1426
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:65
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:50
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:193
9: std::panicking::default_hook
at src/libstd/panicking.rs:210
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:475
12: std::panicking::begin_panic
13: rustc_errors::HandlerInner::bug
14: rustc_errors::Handler::bug
15: rustc::util::bug::opt_span_bug_fmt::{{closure}}
16: rustc::ty::context::tls::with_opt::{{closure}}
17: rustc::ty::context::tls::with_opt
18: rustc::util::bug::opt_span_bug_fmt
19: rustc::util::bug::bug_fmt
20: rustc_typeck::collect::fn_sig
21: rustc::ty::query::__query_compute::fn_sig
22: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::fn_sig>::compute
23: rustc::dep_graph::graph::DepGraph::with_task_impl
24: rustc_rayon_core::tlv::with
25: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
26: rustc::ty::constness::provide::is_const_fn_raw
27: rustc::ty::query::__query_compute::is_const_fn_raw
28: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::is_const_fn_raw>::compute
29: rustc::dep_graph::graph::DepGraph::with_task_impl
30: rustc_rayon_core::tlv::with
31: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
32: <rustc_mir::const_eval::CompileTimeInterpreter as rustc_mir::interpret::machine::Machine>::find_mir_or_eval_fn
33: rustc_mir::interpret::terminator::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_fn_call
34: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::step
35: rustc_mir::const_eval::const_eval_raw_provider
36: rustc::ty::query::__query_compute::const_eval_raw
37: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::const_eval_raw>::compute
38: rustc::dep_graph::graph::DepGraph::with_task_impl
39: rustc_rayon_core::tlv::with
40: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
41: rustc_mir::const_eval::const_eval_provider
42: rustc::ty::query::__query_compute::const_eval
43: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::const_eval>::compute
44: rustc::dep_graph::graph::DepGraph::with_task_impl
45: rustc_rayon_core::tlv::with
46: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
47: rustc_mir::const_eval::const_eval_provider
48: rustc::ty::query::__query_compute::const_eval
49: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::const_eval>::compute
50: rustc::dep_graph::graph::DepGraph::with_task_impl
51: rustc_rayon_core::tlv::with
52: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
53: rustc::ty::sty::Const::eval::{{closure}}
54: <rustc::traits::project::AssocTypeNormalizer as rustc::ty::fold::TypeFolder>::fold_const
55: rustc::ty::structural_impls::<impl rustc::ty::fold::TypeFoldable for &rustc::ty::TyS>::super_fold_with
56: <rustc::traits::project::AssocTypeNormalizer as rustc::ty::fold::TypeFolder>::fold_ty
57: rustc::traits::project::normalize
58: rustc_typeck::check::FnCtxt::normalize_associated_types_in
59: <core::iter::adapters::Map<I,F> as core::iter::traits::iterator::Iterator>::fold
60: rustc_rayon_core::tlv::with
61: rustc::ty::context::GlobalCtxt::enter_local
62: rustc_typeck::check::wfcheck::check_item_well_formed
63: rustc::ty::query::__query_compute::check_item_well_formed
64: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::check_item_well_formed>::compute
65: rustc::dep_graph::graph::DepGraph::with_task_impl
66: rustc_rayon_core::tlv::with
67: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
68: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::ensure_query
69: rustc_rayon::iter::plumbing::Producer::fold_with
70: rustc_rayon::iter::plumbing::bridge_producer_consumer::helper
71: rustc_rayon_core::job::StackJob<L,F,R>::run_inline
72: rustc_rayon_core::registry::in_worker
73: rustc_rayon::iter::plumbing::bridge_producer_consumer::helper
74: std::panicking::try::do_call
75: __rust_maybe_catch_panic
at src/libpanic_unwind/lib.rs:78
76: <rustc_rayon_core::job::StackJob<L,F,R> as rustc_rayon_core::job::Job>::execute
77: rustc_rayon_core::registry::WorkerThread::wait_until_cold
78: rustc_rayon_core::registry::ThreadBuilder::run
79: scoped_tls::ScopedKey<T>::set
80: std::thread::local::LocalKey<T>::with
81: scoped_tls::ScopedKey<T>::set
82: crossbeam_utils::thread::ScopedThreadBuilder::spawn::{{closure}}
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
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 1.41.0-nightly (3ed3b8bb7 2019-12-17) running on x86_64-unknown-linux-gnu
note: compiler flags: -C codegen-units=1 -C debuginfo=2 --crate-type lib
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [fn_sig] processing `Bug::inner::{{constant}}#0::{{closure}}#0`
#1 [is_const_fn_raw] checking if item is const fn: `Bug::inner::{{constant}}#0::{{closure}}#0`
#2 [const_eval_raw] const-evaluating `Bug::inner::{{constant}}#0`
#3 [const_eval] const-evaluating + checking `Bug::inner::{{constant}}#0`
#4 [const_eval] const-evaluating + checking `Bug::inner::{{constant}}#0`
#5 [check_item_well_formed] processing `Bug`
#6 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0015, E0658.
For more information about an error, try `rustc --explain E0015`.
error: could not compile `playground`.