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error: Undefined Behavior: write access through <TAG> at ALLOC[OFFSET] is forbidden
--> tests/fail/async-shared-mutable.rs:LL:CC
|
LL | *x = 1;
| ^^^^^^ Undefined Behavior occurred here
|
= 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/async-shared-mutable.rs:LL:CC
|
LL | / core::future::poll_fn(move |_| {
LL | | *x = 1;
LL | | Poll::<()>::Pending
LL | | })
LL | | .await
| |______________^
help: the accessed tag <TAG> later transitioned to Active due to a child write access at offsets [OFFSET]
--> tests/fail/async-shared-mutable.rs:LL:CC
|
LL | *x = 1;
| ^^^^^^
= 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 reborrow (acting as a foreign read access) at offsets [OFFSET]
--> tests/fail/async-shared-mutable.rs:LL:CC
|
LL | let _: Pin<&_> = f.as_ref(); // Or: `f.as_mut().into_ref()`.
| ^^^^^^^^^^
= help: this transition corresponds to a loss of write permissions
= note: BACKTRACE (of the first span):
= note: inside closure at tests/fail/async-shared-mutable.rs:LL:CC
= note: inside `<std::future::PollFn<{closure@tests/fail/async-shared-mutable.rs:LL:CC}> as std::future::Future>::poll` at RUSTLIB/core/src/future/poll_fn.rs:LL:CC
note: inside closure
--> tests/fail/async-shared-mutable.rs:LL:CC
|
LL | .await
| ^^^^^
note: inside `main`
--> tests/fail/async-shared-mutable.rs:LL:CC
|
LL | assert_eq!(f.as_mut().poll(&mut cx), Poll::Pending);
| ^^^^^^^^^^^^^^^^^^^^^^^^
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to 1 previous error
|
