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/shr_frozen_violation1.rs:LL:CC
4 LL | *(x as *const i32 as *mut i32) = 7;
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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/shr_frozen_violation1.rs:LL:CC
15 LL | *(x as *const i32 as *mut i32) = 7;
18 = note: inside `unknown_code` at $DIR/shr_frozen_violation1.rs:LL:CC
19 note: inside `foo` at $DIR/shr_frozen_violation1.rs:LL:CC
20 --> $DIR/shr_frozen_violation1.rs:LL:CC
22 LL | unknown_code(&*x);
24 note: inside `main` at $DIR/shr_frozen_violation1.rs:LL:CC
25 --> $DIR/shr_frozen_violation1.rs:LL:CC
27 LL | println!("{}", foo(&mut 0));
30 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
32 error: aborting due to previous error