14e72e7ffa
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.
29 lines
1.4 KiB
Plaintext
29 lines
1.4 KiB
Plaintext
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
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--> $DIR/illegal_read2.rs:LL:CC
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LL | let _val = *xref; // ...but any use of raw will invalidate our ref.
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| ^^^^^
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| |
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| attempting a read access using <TAG> at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
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| this error occurs as part of an access at ALLOC[0x0..0x4]
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= help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
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= help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
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help: <TAG> was created by a Unique retag at offsets [0x0..0x4]
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--> $DIR/illegal_read2.rs:LL:CC
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LL | let xref = unsafe { &mut *xraw }; // derived from raw, so using raw is still ok...
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| ^^^^^^^^^^
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help: <TAG> was later invalidated at offsets [0x0..0x4] by a SharedReadOnly retag
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--> $DIR/illegal_read2.rs:LL:CC
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LL | let shr = unsafe { &*xraw };
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| ^^^^^^
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= note: backtrace:
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= note: inside `main` at $DIR/illegal_read2.rs:LL:CC
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note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
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error: aborting due to previous error
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