error[E0080]: writing to ALLOC0 which is read-only
  --> $DIR/ptr_made_global_mutated.rs:10:5
   |
LL |     *(ptr as *mut u8) = 2;
   |     ^^^^^^^^^^^^^^^^^^^^^ evaluation of `A` failed here

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0080`.