pub(crate) enum VarValue<'tcx> {
    Empty(UniverseIndex),
    Value(Region<'tcx>),
    ErrorValue,
}

Variants§

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Empty(UniverseIndex)

Empty lifetime is for data that is never accessed. We tag the empty lifetime with a universe – the idea is that we don’t want exists<'a> { forall<'b> { 'b: 'a } } to be satisfiable. Therefore, the 'empty in a universe U is less than all regions visible from U, but not less than regions not visible from U.

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Value(Region<'tcx>)

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ErrorValue

Trait Implementations§

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impl<'tcx> Clone for VarValue<'tcx>

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fn clone(&self) -> VarValue<'tcx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'tcx> Debug for VarValue<'tcx>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'tcx> Copy for VarValue<'tcx>

Auto Trait Implementations§

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impl<'tcx> RefUnwindSafe for VarValue<'tcx>

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impl<'tcx> Send for VarValue<'tcx>

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impl<'tcx> Sync for VarValue<'tcx>

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impl<'tcx> Unpin for VarValue<'tcx>

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impl<'tcx> UnwindSafe for VarValue<'tcx>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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: 16 bytes

Size for each variant:

  • Empty: 4 bytes
  • Value: 12 bytes
  • ErrorValue: 0 bytes