1 error: Undefined Behavior: attempting a read access using <TAG> at ALLOC[$HEX], but that tag does not exist in the borrow stack for this location
2 --> $DIR/shared_rw_borrows_are_weak2.rs:LL:CC
7 | attempting a read access using <TAG> at ALLOC[$HEX], but that tag does not exist in the borrow stack for this location
8 | this error occurs as part of an access at ALLOC[$HEX..$HEX]
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 [$HEX..$HEX]
13 --> $DIR/shared_rw_borrows_are_weak2.rs:LL:CC
15 LL | let y: &i32 = mem::transmute(&*x.borrow()); // launder lifetime
16 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
17 help: <TAG> was later invalidated at offsets [$HEX..$HEX] by a Unique retag
18 --> $DIR/shared_rw_borrows_are_weak2.rs:LL:CC
20 LL | shr_rw.replace(1);
22 = note: BACKTRACE (of the first span):
23 = note: inside `main` at $DIR/shared_rw_borrows_are_weak2.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