# Enum rustc_trait_selection::traits::outlives_bounds::OutlivesBound

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    pub enum OutlivesBound<'tcx> {
        RegionSubRegion(Region<'tcx>, Region<'tcx>),
        RegionSubParam(Region<'tcx>, ParamTy),
        RegionSubAlias(Region<'tcx>, AliasTy<'tcx>),
    }

Expand description

Outlives bounds are relationships between generic parameters, whether they both be regions (`'a: 'b`) or whether types are involved (`T: 'a`). These relationships can be extracted from the full set of predicates we understand or also from types (in which case they are called implied bounds). They are fed to the `OutlivesEnv` which in turn is supplied to the region checker and other parts of the inference system.

## Variants§

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### RegionSubRegion(Region<'tcx>, Region<'tcx>)

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### RegionSubParam(Region<'tcx>, ParamTy)

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### RegionSubAlias(Region<'tcx>, AliasTy<'tcx>)

## Auto Trait Implementations§

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### impl<'tcx> !RefUnwindSafe for OutlivesBound<'tcx>

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### impl<'tcx> Send for OutlivesBound<'tcx>

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### impl<'tcx> Sync for OutlivesBound<'tcx>

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### impl<'tcx> Unpin for OutlivesBound<'tcx>

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### impl<'tcx> !UnwindSafe for OutlivesBound<'tcx>

## Blanket Implementations§

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### impl<T> Any for T
where 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 T
where 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 T
where 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 T
where 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 T
where 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 T
where 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 T
where 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: 24 bytes

Size for each variant:

- `RegionSubRegion`: 24 bytes
- `RegionSubParam`: 24 bytes
- `RegionSubAlias`: 24 bytes