error: Undefined Behavior: `copy_nonoverlapping` called on overlapping ranges
  --> tests/fail/overlapping_assignment.rs:LL:CC
   |
LL |             *ptr1 = *ptr2;
   |             ^^^^^^^^^^^^^ 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
   = note: BACKTRACE:
   = note: inside `self_copy` at tests/fail/overlapping_assignment.rs:LL:CC
note: inside `main`
  --> tests/fail/overlapping_assignment.rs:LL:CC
   |
LL |     self_copy(ptr, ptr);
   |     ^^^^^^^^^^^^^^^^^^^

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

error: aborting due to 1 previous error