1 error: Undefined Behavior: trying to retag from <TAG> for SharedReadWrite permission at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
2 --> $DIR/interior_mut1.rs:LL:CC
4 LL | let _val = *inner_shr.get();
7 | trying to retag from <TAG> for SharedReadWrite permission at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
8 | this error occurs as part of retag 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 SharedReadWrite retag at offsets [0x0..0x4]
13 --> $DIR/interior_mut1.rs:LL:CC
15 LL | let inner_shr = &*inner_uniq; // adds a SharedReadWrite
17 help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
18 --> $DIR/interior_mut1.rs:LL:CC
20 LL | *c.get() = UnsafeCell::new(1); // invalidates inner_shr
21 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
23 = note: inside `main` at $DIR/interior_mut1.rs:LL:CC
25 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
27 error: aborting due to previous error