Closed
Description
Running yesterday's nightly rustdoc on the following file panics for me:
const fn one(arr: &[u8; 1]) -> u8 {
arr[0]
}
const fn two(byte: u8) -> [u8; 1] {[
byte
]}
const fn three(data: u8) -> u8 {
one(&two(data))
}
const FOO: u8 = three(0x0);
It says thread 'rustc' panicked at 'Layout mismatch when copying!.
The version is rustdoc 1.34.0-nightly (097c04cf4 2019-02-24).
There isn't a problem compiling the file.
Output including backtrace:
% RUST_BACKTRACE=1 rustdoc +nightly --color=never src/lib.rs
thread 'rustc' panicked at 'Layout mismatch when copying!
src: OpTy {
op: Indirect(
MemPlace {
ptr: Ptr(
Pointer {
alloc_id: AllocId(
4
),
offset: Size {
raw: 0
},
tag: ()
}
),
align: Align {
pow2: 0
},
meta: None
}
),
layout: TyLayout {
ty: [u8; 1],
details: LayoutDetails {
variants: Single {
index: 0
},
fields: Array {
stride: Size {
raw: 1
},
count: 1
},
abi: Aggregate {
sized: true
},
align: AbiAndPrefAlign {
abi: Align {
pow2: 0
},
pref: Align {
pow2: 0
}
},
size: Size {
raw: 1
}
}
}
}
dest: PlaceTy {
place: Local {
frame: 0,
local: _2
},
layout: TyLayout {
ty: u8,
details: LayoutDetails {
variants: Single {
index: 0
},
fields: Union(
0
),
abi: Scalar(
Scalar {
value: Int(
I8,
false
),
valid_range: 0..=255
}
),
align: AbiAndPrefAlign {
abi: Align {
pow2: 0
},
pref: Align {
pow2: 0
}
},
size: Size {
raw: 1
}
}
}
}', src/librustc_mir/interpret/place.rs:826:9
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
at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
1: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:70
2: std::panicking::default_hook::{{closure}}
at src/libstd/sys_common/backtrace.rs:58
at src/libstd/panicking.rs:200
3: std::panicking::default_hook
at src/libstd/panicking.rs:215
4: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:478
5: std::panicking::continue_panic_fmt
at src/libstd/panicking.rs:385
6: std::panicking::begin_panic_fmt
at src/libstd/panicking.rs:340
7: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, M>>::copy_op_no_validate
8: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, M>>::run
9: rustc_mir::const_eval::eval_body_using_ecx
10: rustc_mir::const_eval::const_eval_raw_provider
11: rustc::ty::query::__query_compute::const_eval_raw
12: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::const_eval_raw<'tcx>>::compute
13: rustc::dep_graph::graph::DepGraph::with_task_impl
14: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
15: <rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, M>>::const_eval_raw
16: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, M>>::eval_place_to_mplace
17: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, M>>::eval_place
18: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, M>>::run
19: rustc_mir::const_eval::eval_body_using_ecx
20: rustc_mir::const_eval::const_eval_raw_provider
21: rustc::ty::query::__query_compute::const_eval_raw
22: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::const_eval_raw<'tcx>>::compute
23: rustc::dep_graph::graph::DepGraph::with_task_impl
24: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
25: rustc_mir::const_eval::const_eval_provider
26: rustc::ty::query::__query_compute::const_eval
27: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors<'tcx> for rustc::ty::query::queries::const_eval<'tcx>>::compute
28: rustc::dep_graph::graph::DepGraph::with_task_impl
29: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt<'a, 'gcx, 'tcx>>::get_query
30: rustc_lint::builtin::check_const
31: <rustc_lint::register_builtins::BuiltinCombinedLateLintPass as rustc::lint::LateLintPass<'a, 'tcx>>::check_item
32: <rustc::lint::context::LateContext<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_item
33: <rustc::lint::context::LateContext<'a, 'tcx> as rustc::hir::intravisit::Visitor<'tcx>>::visit_mod
34: rustc::hir::intravisit::walk_crate
35: rustc::lint::context::check_crate
36: rustc_driver::driver::phase_3_run_analysis_passes::{{closure}}::{{closure}}
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc_driver/driver.rs:1333
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/util/common.rs:150
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/util/common.rs:144
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc_driver/driver.rs:1333
37: rustc::util::common::time
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/util/common.rs:150
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/util/common.rs:144
38: <std::thread::local::LocalKey<T>>::with
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc_driver/driver.rs:1321
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:2000
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1966
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1899
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1965
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1999
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1954
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/libstd/thread/local.rs:300
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/libstd/thread/local.rs:246
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1946
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/libstd/thread/local.rs:300
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/libstd/thread/local.rs:246
39: rustc::ty::context::TyCtxt::create_and_enter
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1938
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1977
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc/ty/context.rs:1290
40: rustc_driver::driver::phase_3_run_analysis_passes
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc_driver/driver.rs:1213
41: <scoped_tls::ScopedKey<T>>::set
at src/librustdoc/core.rs:494
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc_driver/driver.rs:65
at /cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:155
42: <scoped_tls::ScopedKey<T>>::set
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/librustc_driver/driver.rs:64
at src/librustdoc/core.rs:400
at src/librustdoc/lib.rs:434
at /cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:155
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/libsyntax/lib.rs:100
at /cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-0.1.2/src/lib.rs:155
43: syntax::with_globals
at /rustc/097c04cf433048585dd9e3f63b30e03cc3509e4b/src/libsyntax/lib.rs:99
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 1.34.0-nightly (097c04cf4 2019-02-24) running on i686-unknown-linux-gnu
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Area: Constant evaluation, covers all const contexts (static, const fn, ...)Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️High priorityRelevant to the compiler team, which will review and decide on the PR/issue.Performance or correctness regression from stable to beta.Performance or correctness regression from stable to nightly.