ICE: [u8; 18446744073709551615] is too big for the current architecture

[DutchGhost]

I tried this code:

enum Bug {
    V([u8; !0]),
}

I expected to see this happen: Complain that the array size is too large

Instead, this happened: It crashed the compiler

Meta

rustc --version --verbose:

stable 1.41.0 (5e1a79984 2020-01-27)
beta 1.42.0-beta.4 (13e0fbc20 2020-02-24)
nightly 1.43.0-nightly (6fd8798f4 2020-02-25)

A quick look at Godbolt suggests this has been happening from 1.12 onwards.

Backtrace

rror: internal compiler error: src/librustc_lint/types.rs:1017: failed to get layout for `Bug`: the type `[u8; 18446744073709551615]` is too big for the current architecture

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:883:9
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print_fmt
             at src/libstd/sys_common/backtrace.rs:77
   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:1052
   5: std::io::Write::write_fmt
             at src/libstd/io/mod.rs:1426
   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:204
   9: std::panicking::default_hook
             at src/libstd/panicking.rs:224
  10: rustc_driver::report_ice
  11: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:476
  12: std::panicking::begin_panic
  13: rustc_errors::HandlerInner::bug
  14: rustc_errors::Handler::bug
  15: rustc::util::bug::opt_span_bug_fmt::{{closure}}
  16: rustc::ty::context::tls::with_opt::{{closure}}
  17: rustc::ty::context::tls::with_opt
  18: rustc::util::bug::opt_span_bug_fmt
  19: rustc::util::bug::bug_fmt
  20: <rustc_lint::types::VariantSizeDifferences as rustc_lint::passes::LateLintPass>::check_item
  21: <rustc_lint::BuiltinCombinedModuleLateLintPass as rustc_lint::passes::LateLintPass>::check_item
  22: rustc_hir::intravisit::Visitor::visit_nested_item
  23: rustc_hir::intravisit::walk_mod
  24: rustc_lint::late::late_lint_mod
  25: rustc::ty::query::__query_compute::lint_mod
  26: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::lint_mod>::compute
  27: rustc::dep_graph::graph::DepGraph::with_task_impl
  28: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  29: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::ensure_query
  30: rustc_session::utils::<impl rustc_session::session::Session>::time
  31: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:86
  32: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
  33: __rust_maybe_catch_panic
             at src/libpanic_unwind/lib.rs:86
  34: rustc_session::utils::<impl rustc_session::session::Session>::time
  35: rustc_interface::passes::analysis
  36: rustc::ty::query::__query_compute::analysis
  37: rustc::dep_graph::graph::DepGraph::with_task_impl
  38: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  39: rustc::ty::context::tls::enter_global
  40: rustc_interface::interface::run_compiler_in_existing_thread_pool
  41: scoped_tls::ScopedKey<T>::set
  42: syntax::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

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 1.42.0-beta.4 (13e0fbc20 2020-02-24) running on x86_64-unknown-linux-gnu

note: compiler flags: -C codegen-units=1 -C debuginfo=2 --crate-type lib

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

query stack during panic:
#0 [lint_mod] linting top-level module
#1 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error

Related issues: #23600, #49230