error: Undefined Behavior: attempting a write access using at ALLOC[0x4], but that tag does not exist in the borrow stack for this location --> $DIR/buggy_as_mut_slice.rs:LL:CC | LL | v1[1] = 5; | ^^^^^^^^^ | | | attempting a write access using at ALLOC[0x4], but that tag does not exist in the borrow stack for this location | this error occurs as part of an access at ALLOC[0x4..0x8] | = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information help: was created by a retag at offsets [0x0..0xc] --> $DIR/buggy_as_mut_slice.rs:LL:CC | LL | let v1 = safe::as_mut_slice(&v); | ^^^^^^^^^^^^^^^^^^^^^^ help: was later invalidated at offsets [0x0..0xc] --> $DIR/buggy_as_mut_slice.rs:LL:CC | LL | unsafe { from_raw_parts_mut(self_.as_ptr() as *mut T, self_.len()) } | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ = note: inside `main` at $DIR/buggy_as_mut_slice.rs:LL:CC note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace error: aborting due to previous error