error: Undefined Behavior: out-of-bounds pointer arithmetic: $HEX[noalloc] is a dangling pointer (it has no provenance)
  --> $DIR/ptr_invalid_offset.rs:LL:CC
   |
LL |     let _ = unsafe { roundtrip.offset(1) };
   |                      ^^^^^^^^^^^^^^^^^^^ out-of-bounds pointer arithmetic: $HEX[noalloc] is a dangling pointer (it has no provenance)
   |
   = 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
   = note: backtrace:
   = note: inside `main` at $DIR/ptr_invalid_offset.rs:LL:CC

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

error: aborting due to previous error