# Enum rustc_trait_selection::infer::RegionVariableOrigin

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    pub enum RegionVariableOrigin {
        MiscVariable(Span),
        PatternRegion(Span),
        AddrOfRegion(Span),
        Autoref(Span),
        Coercion(Span),
        RegionParameterDefinition(Span, Symbol),
        BoundRegion(Span, BoundRegionKind, BoundRegionConversionTime),
        UpvarRegion(UpvarId, Span),
        Nll(NllRegionVariableOrigin),
    }

Expand description

Reasons to create a region inference variable.

See `error_reporting` module for more details.

## Variants§

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### MiscVariable(Span)

Region variables created for ill-categorized reasons.

They mostly indicate places in need of refactoring.

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### PatternRegion(Span)

Regions created by a `&P` or `[...]` pattern.

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### AddrOfRegion(Span)

Regions created by `&` operator.

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### Autoref(Span)

Regions created as part of an autoref of a method receiver.

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### Coercion(Span)

Regions created as part of an automatic coercion.

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### RegionParameterDefinition(Span, Symbol)

Region variables created as the values for early-bound regions.

FIXME(@lcnr): This can also store a `DefId`, similar to `TypeVariableOriginKind::TypeParameterDefinition`.

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### BoundRegion(Span, BoundRegionKind, BoundRegionConversionTime)

Region variables created when instantiating a binder with existential variables, e.g. when calling a function or method.

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### UpvarRegion(UpvarId, Span)

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### Nll(NllRegionVariableOrigin)

This origin is used for the inference variables that we create during NLL region processing.

## Auto Trait Implementations§

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### impl RefUnwindSafe for RegionVariableOrigin

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### impl Send for RegionVariableOrigin

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### impl Sync for RegionVariableOrigin

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### impl Unpin for RegionVariableOrigin

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### impl UnwindSafe for RegionVariableOrigin

## 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: 28 bytes

Size for each variant:

- `MiscVariable`: 12 bytes
- `PatternRegion`: 12 bytes
- `AddrOfRegion`: 12 bytes
- `Autoref`: 12 bytes
- `Coercion`: 12 bytes
- `RegionParameterDefinition`: 16 bytes
- `BoundRegion`: 28 bytes
- `UpvarRegion`: 24 bytes
- `Nll`: 24 bytes