ICE on nightly

[valff]

The following code (playground) crashes rustc on latest nightly 1.23.0-nightly (2be4cc040 2017-11-01):

fn main() {
  ::std::ptr::read_volatile(0 as _);
}

Current stable and beta doesn't crash.

What I see:

   Compiling playground v0.0.1 (file:///playground)
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 1.23.0-nightly (2be4cc040 2017-11-01) running on x86_64-unknown-linux-gnu

thread 'rustc' panicked at 'explicit panic', /checkout/src/librustc_typeck/check/cast.rs:108:17
note: Run with `RUST_BACKTRACE=1` for a backtrace.

error: Could not compile `playground`.

To learn more, run the command again with --verbose.