# Type Alias rustc_infer::traits::project::UndoLog

source ·

    pub(crate) type UndoLog<'tcx> = UndoLog<ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>>;

## Aliased Type§

    enum UndoLog<'tcx> {
        Inserted(ProjectionCacheKey<'tcx>),
        Overwrite(ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>),
        Purged,
    }

## Variants§

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### Inserted(ProjectionCacheKey<'tcx>)

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### Overwrite(ProjectionCacheKey<'tcx>, ProjectionCacheEntry<'tcx>)

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### Purged

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 64 bytes

Size for each variant:

- `Inserted`: 32 bytes
- `Overwrite`: 64 bytes
- `Purged`: 0 bytes