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error: Undefined Behavior: read access through <TAG> is forbidden because it is a child of <TAG> which is Disabled.
--> $DIR/write-during-2phase.rs:LL:CC
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LL | fn add(&mut self, n: u64) -> u64 {
| ^^^^^^^^^ read access through <TAG> is forbidden because it is a child of <TAG> which is Disabled.
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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
= note: BACKTRACE:
= note: inside `Foo::add` at $DIR/write-during-2phase.rs:LL:CC
note: inside `main`
--> $DIR/write-during-2phase.rs:LL:CC
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LL | let _res = f.add(unsafe {
| ________________^
LL | | let n = f.0;
LL | | // This is the access at fault, but it's not immediately apparent because
LL | | // the reference that got invalidated is not under a Protector.
LL | | *inner = 42;
LL | | n
LL | | });
| |______^
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to previous error
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