error: Undefined Behavior: in-bounds pointer arithmetic failed: attempting to offset pointer by -$BYTES bytes, but got ALLOC which is at the beginning of the allocation
  --> tests/fail/intrinsics/ptr_offset_overflow.rs:LL:CC
   |
LL |     let x = unsafe { x.offset(isize::MIN) };
   |                      ^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
   |
   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
help: ALLOC was allocated here:
  --> tests/fail/intrinsics/ptr_offset_overflow.rs:LL:CC
   |
LL |     let v = [0i8; 4];
   |         ^
   = note: BACKTRACE (of the first span):
   = note: inside `main` at tests/fail/intrinsics/ptr_offset_overflow.rs:LL:CC

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to 1 previous error