Closed
Description
I was messing around with boxed closures and stumbled upon this compiler error:
src/main.rs:14:9: 14:43 error: internal compiler error: cannot relate bound region: ReScope(DestructionScope(24)) <= ReLateBound(DebruijnIndex { depth: 1 }, BrAnon(0))
src/main.rs:14 Class { methods: BTreeMap::new() }
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
thread 'rustc' panicked at 'Box<Any>', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/libsyntax/diagnostic.rs:176
With this code:
use std::collections::BTreeMap;
pub trait Object {}
pub type Function = Box<Fn(Box<&Object>)>;
pub struct Class {
pub methods: BTreeMap<String, Function>
}
impl Class {
pub fn new() -> Class {
Class { methods: BTreeMap::new() }
}
}Meta
rustc 1.2.0-nightly (c6b148337 2015-06-12)
binary: rustc
commit-hash: c6b14833771d0254d189b368b5ab41b295e02fd1
commit-date: 2015-06-12
host: x86_64-apple-darwin
release: 1.2.0-nightly
Backtrace:
stack backtrace:
1: 0x1131ca8f5 - sys::backtrace::write::h6e963597537e900csas
2: 0x1131d3080 - panicking::on_panic::hc6a54e36471e710eOtw
3: 0x11318db78 - rt::unwind::begin_unwind_inner::hc2503abaf1a353b16bw
4: 0x110d48d6e - rt::unwind::begin_unwind::h15793721380063878962
5: 0x110d48cfa - diagnostic::SpanHandler::span_bug::h305c5fab12e5a61d9zA
6: 0x1103bcdd4 - middle::infer::region_inference::RegionVarBindings<'a, 'tcx>::make_subregion::h061ca723d42f2b22kGx
7: 0x1103d743b - middle::infer::mk_subr::h6aabeab28eb869bbiWA
8: 0x10fee588a - check::regionck::type_must_outlive::h6127674586e2e829Cue
9: 0x10fee3832 - check::dropck::iterate_over_potentially_unsafe_regions_in_type::hf0670724c6862f2eXDa
10: 0x10fee39e6 - check::dropck::iterate_over_potentially_unsafe_regions_in_type::hf0670724c6862f2eXDa
11: 0x10fee39e6 - check::dropck::iterate_over_potentially_unsafe_regions_in_type::hf0670724c6862f2eXDa
12: 0x10fee3b8e - check::dropck::iterate_over_potentially_unsafe_regions_in_type::hf0670724c6862f2eXDa
13: 0x10fee39e6 - check::dropck::iterate_over_potentially_unsafe_regions_in_type::hf0670724c6862f2eXDa
14: 0x10fee39e6 - check::dropck::iterate_over_potentially_unsafe_regions_in_type::hf0670724c6862f2eXDa
15: 0x10fee39e6 - check::dropck::iterate_over_potentially_unsafe_regions_in_type::hf0670724c6862f2eXDa
16: 0x10fee2491 - check::dropck::check_safety_of_destructor_if_necessary::h79249887199f444e7xa
17: 0x10ff197ce - check::regionck::check_safety_of_rvalue_destructor_if_necessary::h10b5f1bee99895872Pd
18: 0x10ff12db3 - check::regionck::visit_expr::h7f33f51c105f70aaYad
19: 0x10ff10bce - check::regionck::Rcx<'a, 'tcx>::visit_fn_body::h238c4dcb7b180b8eqNc
20: 0x10ff0ff93 - check::regionck::regionck_fn::h9c58786b01e83d88MFc
21: 0x10ff87ecd - check::check_bare_fn::h5e361559796822ecrPn
22: 0x10ff94277 - check::check_method_body::h8f03cf9185cde476Aso
23: 0x10ff85937 - check::check_item_body::h0b5b7f65588a40d3igo
24: 0x10ff877f3 - check::check_item_types::h71eb55b1de3fcdd6YMn
25: 0x11004825c - check_crate::h76434164527a1335W8C
26: 0x10f877f7e - driver::phase_3_run_analysis_passes::hc0ba76a3f5e49d6cHGa
27: 0x10f85ab93 - driver::compile_input::h31ee522441ce73a5Sba
28: 0x10f917074 - run_compiler::h1c89bc44a6227123p6b
29: 0x10f9147ea - boxed::F.FnBox<A>::call_box::h3142140668275512800
30: 0x10f913f07 - rt::unwind::try::try_fn::h8655535135861126698
31: 0x11325c418 - rust_try_inner
32: 0x11325c405 - rust_try
33: 0x1131bcd15 - rt::unwind::try::inner_try::hf8418fa68612ccb4Z7v
34: 0x10f914162 - boxed::F.FnBox<A>::call_box::h9735321616466909895
35: 0x1131d1bad - sys::thread::Thread::new::thread_start::h143ebbdca41cb5fdywv
36: 0x7fff95422267 - _pthread_body
37: 0x7fff954221e4 - _pthread_start