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error: Undefined Behavior: write access through <TAG> (root of the allocation) at ALLOC[0x0] is forbidden
--> tests/fail/function_calls/arg_inplace_mutate.rs:LL:CC
|
LL | unsafe { ptr.write(S(0)) };
| ^^^^^^^^^^^^^^^ 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> (root of the allocation) is foreign to the protected tag <TAG> (i.e., it is not a child)
= help: this foreign write access would cause the protected tag <TAG> (currently Unique) to become Disabled
= help: protected tags must never be Disabled
help: the accessed tag <TAG> was created here
--> tests/fail/function_calls/arg_inplace_mutate.rs:LL:CC
|
LL | / mir! {
LL | | let _unit: ();
LL | | {
LL | | let non_copy = S(42);
... |
LL | | }
| |_____^
help: the protected tag <TAG> was created here, in the initial state Reserved
--> tests/fail/function_calls/arg_inplace_mutate.rs:LL:CC
|
LL | unsafe { ptr.write(S(0)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
help: the protected tag <TAG> later transitioned to Unique due to a child write access at offsets [0x0..0x4]
--> tests/fail/function_calls/arg_inplace_mutate.rs:LL:CC
|
LL | unsafe { ptr.write(S(0)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
= help: this transition corresponds to the first write to a 2-phase borrowed mutable reference
= note: BACKTRACE (of the first span):
= note: inside `callee` at tests/fail/function_calls/arg_inplace_mutate.rs:LL:CC
note: inside `main`
--> tests/fail/function_calls/arg_inplace_mutate.rs:LL:CC
|
LL | Call(_unit = callee(Move(*ptr), ptr), ReturnTo(after_call), UnwindContinue())
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
= note: this error originates in the macro `::core::intrinsics::mir::__internal_remove_let` which comes from the expansion of the macro `mir` (in Nightly builds, run with -Z macro-backtrace for more info)
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to 1 previous error
|
