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error: Undefined Behavior: write access through <TAG> at ALLOC[0x0] is forbidden
--> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC
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LL | *y += 1; // Failure
| ^^^^^^^ Undefined Behavior occurred here
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= help: this indicates a potential bug in the program: it performed an invalid operation, but the Tree Borrows rules it violated are still experimental
= help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/tree-borrows.md for further information
= help: the accessed tag <TAG> has state Frozen which forbids this child write access
help: the accessed tag <TAG> was created here, in the initial state Reserved
--> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC
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LL | let y = unsafe { &mut *(x as *mut u8) };
| ^^^^^^^^^^^^^^^^^^^^
help: the accessed tag <TAG> later transitioned to Unique due to a child write access at offsets [0x0..0x1]
--> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC
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LL | *y += 1; // Success
| ^^^^^^^
= help: this transition corresponds to the first write to a 2-phase borrowed mutable reference
help: the accessed tag <TAG> later transitioned to Frozen due to a foreign read access at offsets [0x0..0x1]
--> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC
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LL | let _val = *x;
| ^^
= help: this transition corresponds to a loss of write permissions
= note: BACKTRACE (of the first span):
= note: inside `main` at tests/fail/tree_borrows/alternate-read-write.rs:LL:CC
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to 1 previous error
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