Closed as not planned
Description
With this patch to rustc, I get an ICE compiling stage 1 core:
Compiling core v0.0.0 (D:\repos\rust-lang\rust\src\libcore)
thread 'rustc' panicked at 'Layout mismatch when copying!
src: OpTy {
op: Immediate(
Scalar(
0xffffffffffffffff,
),
),
layout: TyLayout {
ty: isize,
details: LayoutDetails {
variants: Single {
index: 0,
},
fields: Union(
0,
),
abi: Scalar(
Scalar {
value: Int(
I64,
true,
),
valid_range: 0..=18446744073709551615,
},
),
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align {
pow2: 3,
},
pref: Align {
pow2: 3,
},
},
size: Size {
raw: 8,
},
},
},
}
dest: PlaceTy {
place: Ptr(
MemPlace {
ptr: alloc0+0,
align: Align {
pow2: 3,
},
meta: None,
},
),
layout: TyLayout {
ty: isize,
details: LayoutDetails {
variants: Single {
index: 0,
},
fields: Union(
0,
),
abi: Scalar(
Scalar {
value: Int(
I64,
true,
),
valid_range: 0..=18446744073709551615,
},
),
largest_niche: None,
align: AbiAndPrefAlign {
abi: Align {
pow2: 3,
},
pref: Align {
pow2: 3,
},
},
size: Size {
raw: 8,
},
},
},
}', src\librustc_mir\interpret\place.rs:855:9
stack backtrace:
0: backtrace::backtrace::trace_unsynchronized
1: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
2: core::fmt::write
3: std::io::Write::write_fmt
4: std::panicking::take_hook
5: std::panicking::take_hook
6: rustc_driver::report_ice
7: std::panicking::rust_panic_with_hook
8: rust_begin_unwind
9: std::panicking::begin_panic_fmt
10: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::mplace_array_fields
11: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_rvalue_into_place
12: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::run
13: rustc_mir::const_eval::eval_queries::const_eval_raw_provider
14: rustc::ty::query::__query_compute::const_eval_raw
15: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
16: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
17: rustc::ty::query::__query_compute::const_eval_validated
18: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
19: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
20: rustc::ty::query::__query_compute::const_eval_validated
21: <rustc::traits::Vtable<N> as core::clone::Clone>::clone
22: rustc::dep_graph::graph::DepGraph::with_task_impl
23: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
24: rustc::mir::interpret::queries::<impl rustc::ty::context::TyCtxt>::const_eval_poly
25: <rustc_typeck::collect::CollectItemTypesVisitor as rustc_hir::intravisit::Visitor>::visit_item
26: rustc::hir::map::Map::visit_item_likes_in_module
27: rustc_typeck::collect::collect_mod_item_types
28: rustc::ty::query::__query_compute::collect_mod_item_types
29: rustc::ty::fold::<impl rustc::ty::context::TyCtxt>::anonymize_late_bound_regions
30: rustc::dep_graph::graph::DepGraph::with_task_impl
31: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
32: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::ensure_query
33: rustc_typeck::check_crate
34: rustc_interface::passes::create_global_ctxt
35: rustc::ty::query::__query_compute::analysis
36: rustc::dep_graph::graph::DepGraph::with_task_impl
37: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
38: rustc::ty::context::tls::enter_global
39: rustc_interface::interface::run_compiler_in_existing_thread_pool
40: scoped_tls::ScopedKey<T>::set
41: syntax::attr::with_globals
42: rustc_data_structures::cold_path
43: _rust_maybe_catch_panic
44: core::fmt::Write::write_fmt
45: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once
46: std::sys_common::thread::start_thread
47: std::sys::windows::thread::Thread::new
48: BaseThreadInitThunk
49: RtlUserThreadStart
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose 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/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.43.0-dev running on x86_64-pc-windows-msvc
note: compiler flags: -Z external-macro-backtrace -Z binary-dep-depinfo -Z force-unstable-if-unmarked -C opt-level=3 -C debuginfo=0 -C target-feature=+crt-static -C prefer-dynamic -C debug-assertions=n --crate-type lib
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [const_eval_raw] const-evaluating `cmp::Ordering::Less::{{constant}}#0`
#1 [const_eval_validated] const-evaluating + checking `cmp::Ordering::Less::{{constant}}#0`
#2 [const_eval_validated] const-evaluating + checking `cmp::Ordering::Less::{{constant}}#0`
#3 [collect_mod_item_types] collecting item types in module `cmp`
#4 [analysis] running analysis passes on this crate
end of query stack
error: could not compile `core`.
As this is an ICE compiling core I'm not exactly sure how to minimize it.