[][src]Enum rustc::infer::region_constraints::UndoLogEntry

enum UndoLogEntry<'tcx> {
    OpenSnapshot,
    CommitedSnapshot,
    AddVar(RegionVid),
    AddConstraint(Constraint<'tcx>),
    AddVerify(usize),
    AddGiven(Region<'tcx>, RegionVid),
    AddCombination(CombineMapTypeTwoRegions<'tcx>),
    Purged,
}
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Variants

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Pushed when we start a snapshot.

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Replaces an OpenSnapshot when a snapshot is committed, but that snapshot is not the root. If the root snapshot is unrolled, all nested snapshots must be committed.

🔬 This is a nightly-only experimental API. (rustc_private)

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We added RegionVid

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We added the given constraint

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We added the given verify

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We added the given given

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We added a GLB/LUB "combination variable"

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During skolemization, we sometimes purge entries from the undo log in a kind of minisnapshot (unlike other snapshots, this purging actually takes place on success). In that case, we replace the corresponding entry with Noop so as to avoid the need to do a bunch of swapping. (We can't use swap_remove as the order of the vector is important.)

Trait Implementations

impl<'tcx> Copy for UndoLogEntry<'tcx>
[src]

impl<'tcx> Clone for UndoLogEntry<'tcx>
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

impl<'tcx> PartialEq for UndoLogEntry<'tcx>
[src]

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Auto Trait Implementations

impl<'tcx> !Send for UndoLogEntry<'tcx>

impl<'tcx> !Sync for UndoLogEntry<'tcx>

Blanket Implementations

impl<T> MaybeResult for T
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

🔬 This is a nightly-only experimental API. (rustc_private)

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

impl<'a, T> Captures for T where
    T: ?Sized
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T> From for T
[src]

Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
[src]

Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
[src]

Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
[src]

🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more

impl<E> SpecializationError for E
[src]

🔬 This is a nightly-only experimental API. (rustc_private)

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Create an error for a missing method specialization. Defaults to panicking with type, trait & method names. S is the encoder/decoder state type, T is the type being encoded/decoded, and the arguments are the names of the trait and method that should've been overridden. Read more

impl<T> Erased for T
[src]

impl<T> Send for T where
    T: ?Sized
[src]

impl<T> Sync for T where
    T: ?Sized
[src]

impl<T> Erased for T