rust/tests/fail/stacked_borrows/alias_through_mutation.stderr
Ben Kimock 14e72e7ffa Improve information sharing across SB diagnostics
Previous Stacked Borrows diagnostics were missing a lot of information
about the state of the interpreter, and it was difficult to add
additional state because it was threaded through all the intervening
function signatures.

This change factors a lot of the arguments which used to be passed
individually to many stacked borrows functions into a single
`DiagnosticCx`, which is built in `Stacks::for_each`, and since it
wraps a handle to `AllocHistory`, we can now handle more nuanced
things like heterogeneous borrow of `!Freeze` types.
2022-08-18 15:01:03 -04:00

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error: Undefined Behavior: attempting a read access using <TAG> at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
--> $DIR/alias_through_mutation.rs:LL:CC
|
LL | let _val = *target_alias;
| ^^^^^^^^^^^^^
| |
| attempting a read access using <TAG> at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
| this error occurs as part of an access at ALLOC[0x0..0x4]
|
= help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
= help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
help: <TAG> was created by a SharedReadOnly retag at offsets [0x0..0x4]
--> $DIR/alias_through_mutation.rs:LL:CC
|
LL | *x = &mut *(target as *mut _);
| ^^^^^^^^^^^^^^^^^^^^^^^^
help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
--> $DIR/alias_through_mutation.rs:LL:CC
|
LL | *target = 13;
| ^^^^^^^^^^^^
= note: backtrace:
= note: inside `main` at $DIR/alias_through_mutation.rs:LL:CC
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to previous error