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[trait constants] thread 'rustc' panicked at 'assertion failed: (left == right) ...' #70942

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dwrensha opened this issue Apr 9, 2020 · 18 comments · Fixed by #70970
Closed

[trait constants] thread 'rustc' panicked at 'assertion failed: (left == right) ...' #70942

dwrensha opened this issue Apr 9, 2020 · 18 comments · Fixed by #70970
Labels
A-const-eval Area: constant evaluation (mir interpretation) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@dwrensha
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dwrensha commented Apr 9, 2020

I'm seeing an internal compiler error on the following input (found by fuzz-rustc):

trait Nat {
    const VALUE: usize;
}

struct Zero;

impl Nat for Zero {
    const VALUE: i32 = 0;
}

fn main() {
    let _: [i32; Zero::VALUE] = [];
}
$ rustc main.rs
error[E0326]: implemented const `VALUE` has an incompatible type for trait
 --> main.rs:8:18
  |
2 |     const VALUE: usize;
  |                  ----- type in trait
...
8 |     const VALUE: i32 = 0;
  |                  ^^^ expected `usize`, found `i32`

thread 'rustc' panicked at 'assertion failed: `(left == right)`
  left: `8`,
 right: `4`', /rustc/485c5fb6e1bf12cd11a8fac5ee94962e17cff74b/src/libstd/macros.rs:16:9
note: run with `RUST_BACKTRACE=1` environment variable to display a 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 1.44.0-nightly (485c5fb6e 2020-04-08) running on x86_64-unknown-linux-gnu

error: aborting due to previous error

For more information about this error, try `rustc --explain E0326`.
@dwrensha
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dwrensha commented Apr 9, 2020

The ICE seems to have been introduced at some point between rustc versions 1.35 and 1.36.

@Phosphorus15
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Seems like something went wrong with const eval

@Centril Centril added A-const-eval Area: constant evaluation (mir interpretation) I-nominated T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ I-prioritize Issue: Indicates that prioritization has been requested for this issue. P-medium Medium priority and removed I-nominated labels Apr 9, 2020
@Centril
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Centril commented Apr 9, 2020

cc @oli-obk @RalfJung

@RalfJung
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RalfJung commented Apr 9, 2020

Opsie, that ICE is a safety net that protects us against using constant values at the wrong type (and accidentally transmuting them). Looks like something here isn't aware that there was a type error and goes on using the wrong type for the wrong data.

@RalfJung
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RalfJung commented Apr 9, 2020

@dwrensha do you have a backtrace with line numbers?

Curiously, on stable the ICE message is different:

thread 'rustc' panicked at 'Layout mismatch when copying!
src: OpTy {
    op: Immediate(
        Scalar(
            0x00000000,
        ),
    ),
    layout: TyLayout {
        ty: i32,
        details: <lots of stuff>
    }
}
dest: PlaceTy {
    place: Ptr(
        MemPlace {
            ptr: alloc0+0,
            align: Align {
                pow2: 3,
            },
            meta: None,
        },
    ),
    layout: TyLayout {
        ty: usize,
        details: <lots of stuff>
    }
}

@RalfJung
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RalfJung commented Apr 9, 2020 •
edited
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So this looks like something is actually running Miri on this ill-typed code, and then doing a MIR assignment where source and target do not have the same size. Since array lengths are involved, I suspect this is similar to

rust/src/librustc_mir/interpret/place.rs

Lines 932 to 943 in 11f6096

if src.layout.size != dest.layout.size {
// FIXME: This should be an assert instead of an error, but if we transmute within an
// array length computation, `typeck` may not have yet been run and errored out. In fact
// most likey we *are* running `typeck` right now. Investigate whether we can bail out
// on `typeck_tables().has_errors` at all const eval entry points.
debug!("Size mismatch when transmuting!\nsrc: {:#?}\ndest: {:#?}", src, dest);
self.tcx.sess.delay_span_bug(
self.tcx.span,
"size-changing transmute, should have been caught by transmute checking",
);
throw_inval!(TransmuteSizeDiff(src.layout.ty, dest.layout.ty));
}

I wonder if there is some way we can not run Miri on MIR like this that is broken beyond repair, to avoid accumulating such hacks?

@Centril
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Centril commented Apr 9, 2020 •
edited
Loading

With line numbers:

error[E0326]: implemented const `VALUE` has an incompatible type for trait
 --> foo.rs:8:18
  |
2 |     const VALUE: usize;
  |                  ----- type in trait
...
8 |     const VALUE: i32 = 0;
  |                  ^^^ expected `usize`, found `i32`

thread 'rustc' panicked at 'assertion failed: `(left == right)`
  left: `Size { raw: 4 }`,
 right: `Size { raw: 8 }`: Size mismatch when writing bits', src/librustc_mir/interpret/place.rs:740:21
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /home/centril/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/libunwind.rs:86
   1: backtrace::backtrace::trace_unsynchronized
             at /home/centril/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.46/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:78
   3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
             at src/libstd/sys_common/backtrace.rs:59
   4: core::fmt::write
             at src/libcore/fmt/mod.rs:1069
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1504
   6: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:62
   7: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:49
   8: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:198
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:218
  10: <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call
             at ./src/liballoc/boxed.rs:1022
  11: rustc_driver::report_ice
             at src/librustc_driver/lib.rs:1174
  12: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:515
  13: rust_begin_unwind
             at src/libstd/panicking.rs:419
  14: std::panicking::begin_panic_fmt
             at src/libstd/panicking.rs:373
  15: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::write_immediate_no_validate
             at src/librustc_mir/interpret/place.rs:0
  16: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::copy_op_no_validate
             at src/librustc_mir/interpret/place.rs:886
  17: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::copy_op
             at src/librustc_mir/interpret/place.rs:849
  18: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_rvalue_into_place
             at src/librustc_mir/interpret/step.rs:149
  19: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::statement
             at src/librustc_mir/interpret/step.rs:90
  20: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::step
             at src/librustc_mir/interpret/step.rs:67
  21: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::run
             at src/librustc_mir/interpret/step.rs:34
  22: rustc_mir::const_eval::eval_queries::eval_body_using_ecx
             at src/librustc_mir/const_eval/eval_queries.rs:56
  23: rustc_mir::const_eval::eval_queries::const_eval_raw_provider::{{closure}}
             at src/librustc_mir/const_eval/eval_queries.rs:310
  24: core::result::Result<T,E>::and_then
             at ./src/libcore/result.rs:729
  25: rustc_mir::const_eval::eval_queries::const_eval_raw_provider
             at src/librustc_mir/const_eval/eval_queries.rs:310
  26: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_raw>::compute
             at ./src/librustc_middle/ty/query/plumbing.rs:357
  27: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./src/librustc_query_system/dep_graph/graph.rs:303
  28: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./src/librustc_query_system/dep_graph/graph.rs:200
  29: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:592
  30: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
  31: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1695
  32: rustc_middle::ty::context::tls::set_tlv
             at ./src/librustc_middle/ty/context.rs:1679
  33: rustc_middle::ty::context::tls::enter_context
             at ./src/librustc_middle/ty/context.rs:1695
  34: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
  35: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1783
  36: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1767
  37: rustc_middle::ty::context::tls::with_context_opt
             at ./src/librustc_middle/ty/context.rs:1756
  38: rustc_middle::ty::context::tls::with_context
             at ./src/librustc_middle/ty/context.rs:1767
  39: rustc_middle::ty::context::tls::with_related_context
             at ./src/librustc_middle/ty/context.rs:1780
  40: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./src/librustc_middle/ty/query/plumbing.rs:60
  41: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:582
  42: rustc_query_system::query::plumbing::with_diagnostics
             at ./src/librustc_query_system/query/plumbing.rs:292
  43: rustc_query_system::query::plumbing::force_query_with_job
             at ./src/librustc_query_system/query/plumbing.rs:581
  44: rustc_query_system::query::plumbing::try_execute_query
             at ./src/librustc_query_system/query/plumbing.rs:409
  45: rustc_query_system::query::plumbing::get_query::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:626
  46: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./src/librustc_query_system/query/caches.rs:91
  47: rustc_query_system::query::plumbing::try_get_cached
             at ./src/librustc_query_system/query/plumbing.rs:367
  48: rustc_query_system::query::plumbing::get_query
             at ./src/librustc_query_system/query/plumbing.rs:618
  49: rustc_middle::ty::query::TyCtxtAt::const_eval_raw
             at ./src/librustc_middle/ty/query/plumbing.rs:462
  50: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::const_eval_raw
             at ./src/librustc_middle/ty/query/plumbing.rs:425
  51: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
             at src/librustc_mir/const_eval/eval_queries.rs:254
  52: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute
             at ./src/librustc_middle/ty/query/plumbing.rs:357
  53: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./src/librustc_query_system/dep_graph/graph.rs:303
  54: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./src/librustc_query_system/dep_graph/graph.rs:200
  55: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:592
  56: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
  57: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1695
  58: rustc_middle::ty::context::tls::set_tlv
             at ./src/librustc_middle/ty/context.rs:1679
  59: rustc_middle::ty::context::tls::enter_context
             at ./src/librustc_middle/ty/context.rs:1695
  60: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
  61: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1783
  62: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1767
  63: rustc_middle::ty::context::tls::with_context_opt
             at ./src/librustc_middle/ty/context.rs:1756
  64: rustc_middle::ty::context::tls::with_context
             at ./src/librustc_middle/ty/context.rs:1767
  65: rustc_middle::ty::context::tls::with_related_context
             at ./src/librustc_middle/ty/context.rs:1780
  66: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./src/librustc_middle/ty/query/plumbing.rs:60
  67: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:582
  68: rustc_query_system::query::plumbing::with_diagnostics
             at ./src/librustc_query_system/query/plumbing.rs:292
  69: rustc_query_system::query::plumbing::force_query_with_job
             at ./src/librustc_query_system/query/plumbing.rs:581
  70: rustc_query_system::query::plumbing::try_execute_query
             at ./src/librustc_query_system/query/plumbing.rs:409
  71: rustc_query_system::query::plumbing::get_query::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:626
  72: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./src/librustc_query_system/query/caches.rs:91
  73: rustc_query_system::query::plumbing::try_get_cached
             at ./src/librustc_query_system/query/plumbing.rs:367
  74: rustc_query_system::query::plumbing::get_query
             at ./src/librustc_query_system/query/plumbing.rs:618
  75: rustc_middle::ty::query::TyCtxtAt::const_eval_validated
             at ./src/librustc_middle/ty/query/plumbing.rs:462
  76: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::const_eval_validated
             at ./src/librustc_middle/ty/query/plumbing.rs:425
  77: rustc_mir::const_eval::eval_queries::const_eval_validated_provider
             at src/librustc_mir/const_eval/eval_queries.rs:231
  78: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::const_eval_validated>::compute
             at src/librustc_middle/ty/query/plumbing.rs:357
  79: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./src/librustc_query_system/dep_graph/graph.rs:303
  80: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./src/librustc_query_system/dep_graph/graph.rs:200
  81: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:592
  82: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at src/librustc_middle/ty/query/plumbing.rs:71
  83: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at src/librustc_middle/ty/context.rs:1695
  84: rustc_middle::ty::context::tls::set_tlv
             at src/librustc_middle/ty/context.rs:1679
  85: rustc_middle::ty::context::tls::enter_context
             at src/librustc_middle/ty/context.rs:1695
  86: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at src/librustc_middle/ty/query/plumbing.rs:71
  87: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at src/librustc_middle/ty/context.rs:1783
  88: rustc_middle::ty::context::tls::with_context::{{closure}}
             at src/librustc_middle/ty/context.rs:1767
  89: rustc_middle::ty::context::tls::with_context_opt
             at src/librustc_middle/ty/context.rs:1756
  90: rustc_middle::ty::context::tls::with_context
             at src/librustc_middle/ty/context.rs:1767
  91: rustc_middle::ty::context::tls::with_related_context
             at src/librustc_middle/ty/context.rs:1780
  92: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at src/librustc_middle/ty/query/plumbing.rs:60
  93: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:582
  94: rustc_query_system::query::plumbing::with_diagnostics
             at ./src/librustc_query_system/query/plumbing.rs:292
  95: rustc_query_system::query::plumbing::force_query_with_job
             at ./src/librustc_query_system/query/plumbing.rs:581
  96: rustc_query_system::query::plumbing::try_execute_query
             at ./src/librustc_query_system/query/plumbing.rs:409
  97: rustc_query_system::query::plumbing::get_query::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:626
  98: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./src/librustc_query_system/query/caches.rs:91
  99: rustc_query_system::query::plumbing::try_get_cached
             at ./src/librustc_query_system/query/plumbing.rs:367
 100: rustc_query_system::query::plumbing::get_query
             at ./src/librustc_query_system/query/plumbing.rs:618
 101: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id
             at src/librustc_middle/mir/interpret/queries.rs:0
 102: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_resolve
             at src/librustc_middle/mir/interpret/queries.rs:45
 103: rustc_middle::ty::sty::Const::eval::{{closure}}
             at ./src/librustc_middle/ty/sty.rs:2373
 104: rustc_middle::ty::sty::Const::eval
             at ./src/librustc_middle/ty/sty.rs:2394
 105: <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_const
             at src/librustc_trait_selection/traits/project.rs:391
 106: rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::sty::Const>::fold_with
             at ./src/librustc_middle/ty/structural_impls.rs:1005
 107: rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::TyS>::super_fold_with
             at ./src/librustc_middle/ty/structural_impls.rs:874
 108: <rustc_trait_selection::traits::project::AssocTypeNormalizer as rustc_middle::ty::fold::TypeFolder>::fold_ty
             at src/librustc_trait_selection/traits/project.rs:321
 109: rustc_middle::ty::structural_impls::<impl rustc_middle::ty::fold::TypeFoldable for &rustc_middle::ty::TyS>::fold_with
             at ./src/librustc_middle/ty/structural_impls.rs:914
 110: rustc_trait_selection::traits::project::AssocTypeNormalizer::fold
             at ./src/librustc_trait_selection/traits/project.rs:297
 111: rustc_trait_selection::traits::project::normalize_with_depth_to
             at ./src/librustc_trait_selection/traits/project.rs:264
 112: rustc_trait_selection::traits::project::normalize_to
             at ./src/librustc_trait_selection/traits/project.rs:232
 113: rustc_trait_selection::traits::project::normalize
             at ./src/librustc_trait_selection/traits/project.rs:218
 114: <rustc_infer::infer::InferCtxt as rustc_trait_selection::infer::InferCtxtExt>::partially_normalize_associated_types_in
             at ./src/librustc_trait_selection/infer.rs:75
 115: rustc_typeck::check::Inherited::normalize_associated_types_in
             at src/librustc_typeck/check/mod.rs:725
 116: rustc_typeck::check::FnCtxt::normalize_associated_types_in
             at src/librustc_typeck/check/mod.rs:3231
 117: <rustc_typeck::check::FnCtxt as rustc_typeck::astconv::AstConv>::normalize_ty
             at src/librustc_typeck/check/mod.rs:2813
 118: <dyn rustc_typeck::astconv::AstConv>::ast_ty_to_ty
             at src/librustc_typeck/astconv.rs:2776
 119: rustc_typeck::check::FnCtxt::to_ty
             at src/librustc_typeck/check/mod.rs:3296
 120: <rustc_typeck::check::GatherLocalsVisitor as rustc_hir::intravisit::Visitor>::visit_local
             at src/librustc_typeck/check/mod.rs:1195
 121: rustc_hir::intravisit::walk_stmt
             at ./src/librustc_hir/intravisit.rs:1051
 122: rustc_hir::intravisit::Visitor::visit_stmt
             at ./src/librustc_hir/intravisit.rs:339
 123: rustc_hir::intravisit::walk_block
             at ./<::rustc_ast::visit::walk_list macros>:2
 124: rustc_hir::intravisit::walk_expr
             at ./src/librustc_hir/intravisit.rs:0
 125: rustc_hir::intravisit::Visitor::visit_expr
             at ./src/librustc_hir/intravisit.rs:351
 126: rustc_hir::intravisit::walk_body
             at ./src/librustc_hir/intravisit.rs:485
 127: rustc_hir::intravisit::Visitor::visit_body
             at ./src/librustc_hir/intravisit.rs:302
 128: rustc_typeck::check::check_fn
             at src/librustc_typeck/check/mod.rs:1335
 129: rustc_typeck::check::typeck_tables_of_with_fallback::{{closure}}
             at src/librustc_typeck/check/mod.rs:1035
 130: rustc_typeck::check::InheritedBuilder::enter::{{closure}}
             at src/librustc_typeck/check/mod.rs:660
 131: rustc_infer::infer::InferCtxtBuilder::enter::{{closure}}
             at ./src/librustc_infer/infer/mod.rs:595
 132: rustc_middle::ty::context::GlobalCtxt::enter_local::{{closure}}::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1527
 133: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1695
 134: rustc_middle::ty::context::tls::set_tlv
             at ./src/librustc_middle/ty/context.rs:1679
 135: rustc_middle::ty::context::tls::enter_context
             at ./src/librustc_middle/ty/context.rs:1695
 136: rustc_middle::ty::context::GlobalCtxt::enter_local::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1527
 137: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1783
 138: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1767
 139: rustc_middle::ty::context::tls::with_context_opt
             at ./src/librustc_middle/ty/context.rs:1756
 140: rustc_middle::ty::context::tls::with_context
             at ./src/librustc_middle/ty/context.rs:1767
 141: rustc_middle::ty::context::tls::with_related_context
             at ./src/librustc_middle/ty/context.rs:1780
 142: rustc_middle::ty::context::GlobalCtxt::enter_local
             at ./src/librustc_middle/ty/context.rs:1519
 143: rustc_infer::infer::InferCtxtBuilder::enter
             at ./src/librustc_infer/infer/mod.rs:594
 144: rustc_typeck::check::InheritedBuilder::enter
             at src/librustc_typeck/check/mod.rs:660
 145: rustc_typeck::check::typeck_tables_of_with_fallback
             at src/librustc_typeck/check/mod.rs:1005
 146: rustc_typeck::check::typeck_tables_of
             at src/librustc_typeck/check/mod.rs:966
 147: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck_tables_of>::compute
             at ./src/librustc_middle/ty/query/plumbing.rs:357
 148: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./src/librustc_query_system/dep_graph/graph.rs:303
 149: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./src/librustc_query_system/dep_graph/graph.rs:200
 150: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:592
 151: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
 152: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1695
 153: rustc_middle::ty::context::tls::set_tlv
             at ./src/librustc_middle/ty/context.rs:1679
 154: rustc_middle::ty::context::tls::enter_context
             at ./src/librustc_middle/ty/context.rs:1695
 155: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
 156: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1783
 157: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1767
 158: rustc_middle::ty::context::tls::with_context_opt
             at ./src/librustc_middle/ty/context.rs:1756
 159: rustc_middle::ty::context::tls::with_context
             at ./src/librustc_middle/ty/context.rs:1767
 160: rustc_middle::ty::context::tls::with_related_context
             at ./src/librustc_middle/ty/context.rs:1780
 161: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./src/librustc_middle/ty/query/plumbing.rs:60
 162: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:582
 163: rustc_query_system::query::plumbing::with_diagnostics
             at ./src/librustc_query_system/query/plumbing.rs:292
 164: rustc_query_system::query::plumbing::force_query_with_job
             at ./src/librustc_query_system/query/plumbing.rs:581
 165: rustc_query_system::query::plumbing::try_execute_query
             at ./src/librustc_query_system/query/plumbing.rs:409
 166: rustc_query_system::query::plumbing::get_query::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:626
 167: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./src/librustc_query_system/query/caches.rs:91
 168: rustc_query_system::query::plumbing::try_get_cached
             at ./src/librustc_query_system/query/plumbing.rs:367
 169: rustc_query_system::query::plumbing::get_query
             at ./src/librustc_query_system/query/plumbing.rs:618
 170: rustc_query_system::query::plumbing::ensure_query
             at ./src/librustc_query_system/query/plumbing.rs:660
 171: rustc_middle::ty::query::TyCtxtEnsure::typeck_tables_of
             at ./src/librustc_middle/ty/query/plumbing.rs:384
 172: rustc_typeck::check::typeck_item_bodies::{{closure}}
             at src/librustc_typeck/check/mod.rs:754
 173: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::par_body_owners::{{closure}}
             at ./src/librustc_middle/ty/mod.rs:2724
 174: core::iter::traits::iterator::Iterator::for_each::call::{{closure}}
             at ./src/libcore/iter/traits/iterator.rs:655
 175: core::iter::traits::iterator::Iterator::fold::ok::{{closure}}
             at ./src/libcore/iter/traits/iterator.rs:2002
 176: core::iter::traits::iterator::Iterator::try_fold
             at ./src/libcore/iter/traits/iterator.rs:1878
 177: core::iter::traits::iterator::Iterator::fold
             at ./src/libcore/iter/traits/iterator.rs:2005
 178: core::iter::traits::iterator::Iterator::for_each
             at ./src/libcore/iter/traits/iterator.rs:658
 179: rustc_middle::ty::<impl rustc_middle::ty::context::TyCtxt>::par_body_owners
             at ./src/librustc_middle/ty/mod.rs:2723
 180: rustc_typeck::check::typeck_item_bodies
             at src/librustc_typeck/check/mod.rs:753
 181: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::typeck_item_bodies>::compute
             at ./src/librustc_middle/ty/query/plumbing.rs:357
 182: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./src/librustc_query_system/dep_graph/graph.rs:303
 183: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./src/librustc_query_system/dep_graph/graph.rs:200
 184: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:592
 185: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
 186: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1695
 187: rustc_middle::ty::context::tls::set_tlv
             at ./src/librustc_middle/ty/context.rs:1679
 188: rustc_middle::ty::context::tls::enter_context
             at ./src/librustc_middle/ty/context.rs:1695
 189: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
 190: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1783
 191: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1767
 192: rustc_middle::ty::context::tls::with_context_opt
             at ./src/librustc_middle/ty/context.rs:1756
 193: rustc_middle::ty::context::tls::with_context
             at ./src/librustc_middle/ty/context.rs:1767
 194: rustc_middle::ty::context::tls::with_related_context
             at ./src/librustc_middle/ty/context.rs:1780
 195: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./src/librustc_middle/ty/query/plumbing.rs:60
 196: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:582
 197: rustc_query_system::query::plumbing::with_diagnostics
             at ./src/librustc_query_system/query/plumbing.rs:292
 198: rustc_query_system::query::plumbing::force_query_with_job
             at ./src/librustc_query_system/query/plumbing.rs:581
 199: rustc_query_system::query::plumbing::try_execute_query
             at ./src/librustc_query_system/query/plumbing.rs:409
 200: rustc_query_system::query::plumbing::get_query::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:626
 201: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./src/librustc_query_system/query/caches.rs:91
 202: rustc_query_system::query::plumbing::try_get_cached
             at ./src/librustc_query_system/query/plumbing.rs:367
 203: rustc_query_system::query::plumbing::get_query
             at ./src/librustc_query_system/query/plumbing.rs:618
 204: rustc_middle::ty::query::TyCtxtAt::typeck_item_bodies
             at ./src/librustc_middle/ty/query/plumbing.rs:462
 205: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::typeck_item_bodies
             at ./src/librustc_middle/ty/query/plumbing.rs:425
 206: rustc_typeck::check_crate::{{closure}}
             at src/librustc_typeck/lib.rs:346
 207: rustc_data_structures::profiling::VerboseTimingGuard::run
             at ./src/librustc_data_structures/profiling.rs:568
 208: rustc_session::utils::<impl rustc_session::session::Session>::time
             at ./src/librustc_session/utils.rs:9
 209: rustc_typeck::check_crate
             at src/librustc_typeck/lib.rs:346
 210: rustc_interface::passes::analysis
             at src/librustc_interface/passes.rs:808
 211: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
             at ./src/librustc_middle/ty/query/plumbing.rs:357
 212: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./src/librustc_query_system/dep_graph/graph.rs:303
 213: rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task
             at ./src/librustc_query_system/dep_graph/graph.rs:336
 214: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:584
 215: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
 216: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1695
 217: rustc_middle::ty::context::tls::set_tlv
             at ./src/librustc_middle/ty/context.rs:1679
 218: rustc_middle::ty::context::tls::enter_context
             at ./src/librustc_middle/ty/context.rs:1695
 219: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./src/librustc_middle/ty/query/plumbing.rs:71
 220: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1783
 221: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1767
 222: rustc_middle::ty::context::tls::with_context_opt
             at ./src/librustc_middle/ty/context.rs:1756
 223: rustc_middle::ty::context::tls::with_context
             at ./src/librustc_middle/ty/context.rs:1767
 224: rustc_middle::ty::context::tls::with_related_context
             at ./src/librustc_middle/ty/context.rs:1780
 225: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./src/librustc_middle/ty/query/plumbing.rs:60
 226: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:582
 227: rustc_query_system::query::plumbing::with_diagnostics
             at ./src/librustc_query_system/query/plumbing.rs:292
 228: rustc_query_system::query::plumbing::force_query_with_job
             at ./src/librustc_query_system/query/plumbing.rs:581
 229: rustc_query_system::query::plumbing::try_execute_query
             at ./src/librustc_query_system/query/plumbing.rs:409
 230: rustc_query_system::query::plumbing::get_query::{{closure}}
             at ./src/librustc_query_system/query/plumbing.rs:626
 231: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./src/librustc_query_system/query/caches.rs:91
 232: rustc_query_system::query::plumbing::try_get_cached
             at ./src/librustc_query_system/query/plumbing.rs:367
 233: rustc_query_system::query::plumbing::get_query
             at ./src/librustc_query_system/query/plumbing.rs:618
 234: rustc_middle::ty::query::TyCtxtAt::analysis
             at ./src/librustc_middle/ty/query/plumbing.rs:462
 235: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::analysis
             at ./src/librustc_middle/ty/query/plumbing.rs:425
 236: rustc_driver::run_compiler::{{closure}}::{{closure}}::{{closure}}
             at src/librustc_driver/lib.rs:385
 237: rustc_middle::ty::context::tls::enter_global::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1718
 238: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./src/librustc_middle/ty/context.rs:1695
 239: rustc_middle::ty::context::tls::set_tlv
             at ./src/librustc_middle/ty/context.rs:1679
 240: rustc_middle::ty::context::tls::enter_context
             at ./src/librustc_middle/ty/context.rs:1695
 241: rustc_middle::ty::context::tls::enter_global
             at ./src/librustc_middle/ty/context.rs:1718
 242: rustc_interface::passes::QueryContext::enter
             at ./src/librustc_interface/passes.rs:709
 243: rustc_driver::run_compiler::{{closure}}::{{closure}}
             at src/librustc_driver/lib.rs:385
 244: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
             at ./src/librustc_interface/queries.rs:385
 245: rustc_driver::run_compiler::{{closure}}
             at src/librustc_driver/lib.rs:285
 246: rustc_interface::interface::run_compiler_in_existing_thread_pool
             at ./src/librustc_interface/interface.rs:199
 247: rustc_interface::interface::run_compiler::{{closure}}
             at ./src/librustc_interface/interface.rs:213
 248: rustc_interface::util::spawn_thread_pool::{{closure}}::{{closure}}::{{closure}}
             at ./src/librustc_interface/util.rs:152
 249: scoped_tls::ScopedKey<T>::set
             at /home/centril/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137
 250: rustc_interface::util::spawn_thread_pool::{{closure}}::{{closure}}
             at ./src/librustc_interface/util.rs:148
 251: scoped_tls::ScopedKey<T>::set
             at /home/centril/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137
 252: rustc_ast::attr::with_globals::{{closure}}
             at ./src/librustc_ast/attr/mod.rs:44
 253: scoped_tls::ScopedKey<T>::set
             at /home/centril/.cargo/registry/src/github.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137
 254: rustc_ast::attr::with_globals
             at ./src/librustc_ast/attr/mod.rs:44
 255: rustc_interface::util::spawn_thread_pool::{{closure}}
             at ./src/librustc_interface/util.rs:147
 256: rustc_interface::util::scoped_thread::{{closure}}
             at ./src/librustc_interface/util.rs:122
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 1.44.0-dev running on x86_64-unknown-linux-gnu

query stack during panic:
#0 [const_eval_raw] const-evaluating `main::{{constant}}#0`
#1 [const_eval_validated] const-evaluating + checking `main::{{constant}}#0`
#2 [const_eval_validated] const-evaluating + checking `main::{{constant}}#0`
#3 [typeck_tables_of] type-checking `main`
#4 [typeck_item_bodies] type-checking all item bodies
#5 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error

For more information about this error, try `rustc --explain E0326`.

@steffahn
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steffahn commented Apr 9, 2020 •
edited
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The ICE seems to have been introduced at some point between rustc versions 1.35 and 1.36.

Bisection points to 45bbd14 (#60126).

@Phosphorus15
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The ICE seems to have been introduced at some point between rustc versions 1.35 and 1.36.

Bisection points to 45bbd14 (#60126).

related issue #30999, which is requesting for an adjustment of error messages' order (and finally leaves the type error along), wonder if we can simply revert this

@steffahn
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steffahn commented Apr 9, 2020 •
edited
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Bisection points to 45bbd14 (#60126).

Well, on a second look, the error message on that regression is different though, so perhaps that part is fixed, I don’t know, I’ll see where it changes.

message on nightly-2019-04-24 
error[E0326]: implemented const `VALUE` has an incompatible type for trait
 --> src\main.rs:8:18
  |
2 |     const VALUE: usize;
  |                  ----- type in trait
...
8 |     const VALUE: i32 = 0;
  |                  ^^^ expected usize, found i32

thread 'rustc' panicked at 'Layout mismatch when copying!
src: OpTy {
    op: Indirect(
        MemPlace {
            ptr: Ptr(
                Pointer {
                    alloc_id: AllocId(
                        1,
                    ),
                    offset: Size {
                        raw: 0,
                    },
                    tag: (),
                },
            ),
            align: Align {
                pow2: 2,
            },
            meta: None,
        },
    ),
    layout: TyLayout {
        ty: i32,
        details: LayoutDetails {
            variants: Single {
                index: 0,
            },
            fields: Union(
                0,
            ),
            abi: Scalar(
                Scalar {
                    value: Int(
                        I32,
                        true,
                    ),
                    valid_range: 0..=4294967295,
                },
            ),
            align: AbiAndPrefAlign {
                abi: Align {
                    pow2: 2,
                },
                pref: Align {
                    pow2: 2,
                },
            },
            size: Size {
                raw: 4,
            },
        },
    },
}
dest: PlaceTy {
    place: Ptr(
        MemPlace {
            ptr: Ptr(
                Pointer {
                    alloc_id: AllocId(
                        0,
                    ),
                    offset: Size {
                        raw: 0,
                    },
                    tag: (),
                },
            ),
            align: Align {
                pow2: 3,
            },
            meta: None,
        },
    ),
    layout: TyLayout {
        ty: usize,
        details: LayoutDetails {
            variants: Single {
                index: 0,
            },
            fields: Union(
                0,
            ),
            abi: Scalar(
                Scalar {
                    value: Int(
                        I64,
                        false,
                    ),
                    valid_range: 0..=18446744073709551615,
                },
            ),
            align: AbiAndPrefAlign {
                abi: Align {
                    pow2: 3,
                },
                pref: Align {
                    pow2: 3,
                },
            },
            size: Size {
                raw: 8,
            },
        },
    },
}', src\librustc_mir\interpret\place.rs:817:9
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
error: aborting due to previous error

For more information about this error, try `rustc --explain E0326`.

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 1.36.0-nightly (e938c2b9a 2019-04-23) running on x86_64-pc-windows-msvc

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

Edit: It changes only on the current beta 1.43.
Edit2: Just noticing that the error has maybe just changed mostly in appearance and less in content. There’s already a 4 vs 8 conflict in these layout structs under size.

@RalfJung
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RalfJung commented Apr 9, 2020

@steffahn indeed, see my message above -- the message changed between stable and nightly. But I think the underlying issue is the same, we just changed the order in which a few assertions are checked.

#60126 sounds like exactly the kind of thing that would lead to running Miri on ill-typed MIR.

@RalfJung
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RalfJung commented Apr 9, 2020

Hm, however, looking at @Centril's stack trace above, I do quite wonder how we are getting past the mir_assign_valid_types check. That one should not let types with different size pass through. We recently changed that check, which explains the nightly vs. stable difference, but this is an unexpected consequence of this change. Cc @eddyb

@eddyb
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eddyb commented Apr 9, 2020 •
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Thanks for pinging me, I believe I've already fixed this in a PR of mine, I should've submitted as a separate PR. Will do that now, assuming it fixes this issue.

For the record, said commit is the first commit in #70452 (currently 7c0257f), titled
"typeck: track any errors injected during writeback and taint tables appropriately.".

EDIT: ugh, it doesn't because the body that should've been tainted-by-errors is the associated const in the impl which doesn't know it has the wrong type (because the error is a separate check).

@eddyb eddyb mentioned this issue Apr 9, 2020
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steffahn commented Apr 9, 2020

Edit: It changes only on the current beta 1.43.

More precisely, the error message changes to (pretty much) the current one in #69181.

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RalfJung commented Apr 9, 2020 •
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@steffahn thanks, that makes a lot of sense.

Hm, however, looking at @Centril's stack trace above, I do quite wonder how we are getting past the mir_assign_valid_types check.

Turns out the types on both sides are fine. It's just that the value returned by eval_operand does not match the type (we are getting a 32bit-value at type usize). So the type check is fine but the value sanity check later ICEs. Just like I was worried in #69181, that PR broke layer one of our safety net by throwing away some layout information; this ICE was triggered by layer two.^^

EDIT: Okay what I was worried about was actually the other call site changed in that PR.

@RalfJung RalfJung mentioned this issue Apr 9, 2020
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@eddyb eddyb mentioned this issue Apr 10, 2020
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eddyb commented Apr 10, 2020

Fix is up at #70970.

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This is a test
@rustbot prioritize

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rustbot commented Apr 10, 2020

Error: This issue has already been requested for prioritization.

Please let @rust-lang/release know if you're having trouble with this bot.

@JohnTitor JohnTitor added the C-bug Category: This is a bug. label Apr 12, 2020
@eddyb eddyb mentioned this issue Apr 13, 2020
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@spastorino spastorino added I-prioritize Issue: Indicates that prioritization has been requested for this issue. regression-from-stable-to-stable Performance or correctness regression from one stable version to another. and removed I-prioritize Issue: Indicates that prioritization has been requested for this issue. labels Apr 14, 2020
@bors bors closed this as completed in 707004c Apr 22, 2020
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A-const-eval Area: constant evaluation (mir interpretation) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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Detect mistyped associated consts in Instance::resolve. eddyb/rust
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@spastorino @eddyb @RalfJung @dwrensha @Centril @steffahn @Phosphorus15 @JohnTitor @LeSeulArtichaut @rustbot