Compiler version: rustc 1.27.0-nightly (ff2ac35db 2018-05-12)
Stack trace:
thread 'main' panicked at 'const_val_field on non-field', libcore/option.rs:914:5
stack backtrace:
0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
1: std::sys_common::backtrace::print
at libstd/sys_common/backtrace.rs:71
at libstd/sys_common/backtrace.rs:59
2: std::panicking::default_hook::{{closure}}
at libstd/panicking.rs:211
3: std::panicking::default_hook
at libstd/panicking.rs:227
4: rustc::util::common::panic_hook
5: std::panicking::rust_panic_with_hook
at libstd/panicking.rs:467
6: std::panicking::begin_panic_fmt
at libstd/panicking.rs:350
7: rust_begin_unwind
at libstd/panicking.rs:328
8: core::panicking::panic_fmt
at libcore/panicking.rs:71
9: core::option::expect_failed
at libcore/option.rs:914
10: rustc_mir::interpret::const_eval::const_val_field
11: rustc_mir::hair::pattern::PatternContext::const_to_pat::{{closure}}
12: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
13: rustc_mir::hair::pattern::PatternContext::const_to_pat
14: rustc_mir::hair::pattern::PatternContext::lower_path
15: rustc_mir::hair::pattern::PatternContext::lower_pattern
16: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &'a mut F>::call_once
17: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
18: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter
19: <rustc_mir::hair::pattern::check_match::MatchVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_expr
20: <rustc_mir::hair::pattern::check_match::MatchVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_expr
21: <rustc_mir::hair::pattern::check_match::MatchVisitor<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_body
22: rustc::session::Session::track_errors
23: rustc_mir::hair::pattern::check_match::check_match
24: rustc::dep_graph::graph::DepGraph::with_task_impl
25: rustc::ty::context::tls::with_related_context
26: rustc::ty::maps::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::force_query_with_job
27: rustc::ty::maps::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
28: rustc::hir::intravisit::Visitor::visit_nested_body
29: rustc::hir::Crate::visit_all_item_likes
30: rustc_mir::hair::pattern::check_match::check_crate
31: rustc::util::common::time
32: rustc::ty::context::tls::enter_context
33: <std::thread::local::LocalKey<T>>::with
34: rustc::ty::context::TyCtxt::create_and_enter
35: rustc_driver::driver::compile_input
36: rustc_driver::run_compiler_impl
37: <scoped_tls::ScopedKey<T>>::set
38: syntax::with_globals
39: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
40: __rust_maybe_catch_panic
at libpanic_unwind/lib.rs:105
41: rustc_driver::run
42: rustc_driver::main
43: std::rt::lang_start::{{closure}}
44: std::panicking::try::do_call
at libstd/rt.rs:59
at libstd/panicking.rs:310
45: __rust_maybe_catch_panic
at libpanic_unwind/lib.rs:105
46: std::rt::lang_start_internal
at libstd/panicking.rs:289
at libstd/panic.rs:374
at libstd/rt.rs:58
47: main
48: __libc_start_main
49: <unknown>
query stack during panic:
#0 [check_match] processing `Stat::from_index`
end of query stack
error: internal compiler error: unexpected panic
Code:
pub struct Stats;
#[derive(PartialEq, Eq)]
pub struct StatVariant {
pub id: u8,
_priv: (),
}
#[derive(PartialEq, Eq)]
pub struct Stat {
pub variant: StatVariant,
pub index: usize,
_priv: (),
}
impl Stats {
pub const TEST: StatVariant = StatVariant{id: 0, _priv: (),};
#[allow(non_upper_case_globals)]
pub const A: Stat = Stat{
variant: Self::TEST,
index: 0,
_priv: (),};
}
impl Stat {
pub fn from_index(variant: StatVariant, index: usize) -> Option<Stat> {
let stat = Stat{variant, index, _priv: (),};
match stat {
Stats::A => Some(Stats::A),
_ => None,
}
}
}
fn main() {
}I tried to reduce it as it was originally generated by a macro, this is about as small as I could get it.
Compiler version:
rustc 1.27.0-nightly (ff2ac35db 2018-05-12)Stack trace:
Code:
I tried to reduce it as it was originally generated by a macro, this is about as small as I could get it.