warning: skipping const checks
   |
help: skipping check that does not even have a feature gate
  --> $DIR/mutable_const2.rs:13:38
   |
LL | const MUTABLE_BEHIND_RAW: *mut i32 = &UnsafeCell::new(42) as *const _ as *mut _;
   |                                      ^^^^^^^^^^^^^^^^^^^^

warning: 1 warning emitted

error: internal compiler error: mutable allocation in constant
  --> $DIR/mutable_const2.rs:13:1
   |
LL | const MUTABLE_BEHIND_RAW: *mut i32 = &UnsafeCell::new(42) as *const _ as *mut _;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

thread 'rustc' panicked at 'no errors encountered even though `delay_span_bug` issued', src/librustc_errors/lib.rs:366:17
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 VERSION running on TARGET

note: compiler flags: FLAGS