1 error: Undefined Behavior: attempting a write access using <untagged> at ALLOC[0x0], but that tag only grants SharedReadOnly permission for this location
2 --> $DIR/shr_frozen_violation1.rs:LL:CC
4 LL | unsafe { *(x as *const i32 as *mut i32) = 7; }
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 | attempting a write access using <untagged> 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 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 most recently created at offsets [0x0..0x4]
13 --> $DIR/shr_frozen_violation1.rs:LL:CC
15 LL | unsafe { *(x as *const i32 as *mut i32) = 7; }
17 = note: inside `unknown_code` at $DIR/shr_frozen_violation1.rs:LL:CC
18 note: inside `foo` at $DIR/shr_frozen_violation1.rs:LL:CC
19 --> $DIR/shr_frozen_violation1.rs:LL:CC
21 LL | unknown_code(&*x);
23 note: inside `main` at $DIR/shr_frozen_violation1.rs:LL:CC
24 --> $DIR/shr_frozen_violation1.rs:LL:CC
26 LL | println!("{}", foo(&mut 0));
29 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
31 error: aborting due to previous error