1 error: Undefined Behavior: attempting a write access using <TAG> at ALLOC[0x0], but that tag only grants SharedReadOnly permission for this location
2 --> $DIR/illegal_write3.rs:LL:CC
4 LL | unsafe { *ptr = 42 };
7 | attempting a write access using <TAG> at ALLOC[0x0], but that tag only grants SharedReadOnly permission for this location
8 | this error occurs as part of an access at ALLOC[0x0..0x4]
10 = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
11 = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
12 help: <TAG> was created by a SharedReadOnly retag at offsets [0x0..0x4]
13 --> $DIR/illegal_write3.rs:LL:CC
15 LL | let ptr = r#ref as *const _ as *mut _; // raw ptr, with raw tag
18 = note: inside `main` at $DIR/illegal_write3.rs:LL:CC
20 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
22 error: aborting due to previous error