ICE with mir-opt-level=2: Got a wide pointer where a scalar was expected

[bytwise]

pub fn parse(version: ()) {
    p(&b'.', b"0");
}
#[inline(always)]
fn p(byte: &u8, s: &[u8]) {
    !(s[0] == *byte);
}

Compiler output

error: internal compiler error: src/librustc_mir/interpret/operand.rs:69: Got a wide pointer where a scalar was expected

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:891:9
stack backtrace:
   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
   1: core::fmt::write
   2: std::io::Write::write_fmt
   3: std::panicking::default_hook::{{closure}}
   4: std::panicking::default_hook
   5: rustc_driver::report_ice
   6: std::panicking::rust_panic_with_hook
   7: std::panicking::begin_panic
   8: rustc_errors::HandlerInner::bug
   9: rustc_errors::Handler::bug
  10: rustc::util::bug::opt_span_bug_fmt::{{closure}}
  11: rustc::ty::context::tls::with_opt::{{closure}}
  12: rustc::ty::context::tls::with_opt
  13: rustc::util::bug::opt_span_bug_fmt
  14: rustc::util::bug::bug_fmt
  15: rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::read_scalar
  16: rustc_mir::interpret::place::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::mplace_projection
  17: rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_place_to_op
  18: rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_operand
  19: rustc_mir::interpret::step::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::eval_rvalue_into_place
  20: <rustc_mir::transform::const_prop::ConstPropagator as rustc::mir::visit::MutVisitor>::visit_statement
  21: <rustc_mir::transform::const_prop::ConstProp as rustc_mir::transform::MirPass>::run_pass
  22: rustc_mir::transform::run_passes
  23: rustc_mir::transform::run_optimization_passes
  24: rustc_mir::transform::optimized_mir
  25: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::optimized_mir>::compute
  26: rustc::dep_graph::graph::DepGraph::with_task_impl
  27: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  28: rustc::ty::<impl rustc::ty::context::TyCtxt>::instance_mir
  29: rustc_mir::monomorphize::collector::collect_items_rec
  30: rustc_mir::monomorphize::collector::collect_crate_mono_items::{{closure}}
  31: rustc::util::common::time
  32: rustc_mir::monomorphize::collector::collect_crate_mono_items
  33: rustc::util::common::time
  34: rustc_mir::monomorphize::partitioning::collect_and_partition_mono_items
  35: rustc::ty::query::__query_compute::collect_and_partition_mono_items
  36: rustc::dep_graph::graph::DepGraph::with_task_impl
  37: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  38: rustc_codegen_ssa::back::symbol_export::exported_symbols_provider_local
  39: rustc::ty::query::__query_compute::exported_symbols
  40: rustc::dep_graph::graph::DepGraph::with_task_impl
  41: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
  42: rustc_metadata::rmeta::encoder::EncodeContext::encode_crate_root
  43: rustc::ty::context::tls::with_context::{{closure}}
  44: rustc_metadata::rmeta::encoder::encode_metadata
  45: rustc_metadata::rmeta::decoder::cstore_impl::<impl rustc::middle::cstore::CrateStore for rustc_metadata::creader::CStore>::encode_metadata
  46: rustc::ty::context::TyCtxt::encode_metadata
  47: rustc_interface::passes::encode_and_write_metadata
  48: rustc::util::common::time
  49: rustc_interface::passes::start_codegen
  50: rustc::ty::context::tls::enter_global
  51: rustc_interface::queries::Queries::ongoing_codegen
  52: rustc_interface::interface::run_compiler_in_existing_thread_pool
  53: std::thread::local::LocalKey<T>::with
  54: scoped_tls::ScopedKey<T>::set
  55: 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-nightly (74c4e6a98 2019-12-27) running on x86_64-apple-darwin

note: compiler flags: -Z mir-opt-level=2 --crate-type lib

query stack during panic:
#0 [optimized_mir] processing `parse`
#1 [collect_and_partition_mono_items] collect_and_partition_mono_items
#2 [exported_symbols] exported_symbols
end of query stack
error: aborting due to previous error

[Centril]

cc @oli-obk @wesleywiser

[Aaron1011]

Note that you need to add fn main() { parse(()) } to actually reproduce the ICE