pub enum Constraint<'tcx> {
    VarSubVar(RegionVid, RegionVid),
    RegSubVar(Region<'tcx>, RegionVid),
    VarSubReg(RegionVid, Region<'tcx>),
    RegSubReg(Region<'tcx>, Region<'tcx>),
}
Expand description

Represents a constraint that influences the inference process.

Variants§

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VarSubVar(RegionVid, RegionVid)

A region variable is a subregion of another.

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RegSubVar(Region<'tcx>, RegionVid)

A concrete region is a subregion of region variable.

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VarSubReg(RegionVid, Region<'tcx>)

A region variable is a subregion of a concrete region. This does not directly affect inference, but instead is checked after inference is complete.

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RegSubReg(Region<'tcx>, Region<'tcx>)

A constraint where neither side is a variable. This does not directly affect inference, but instead is checked after inference is complete.

Implementations§

Trait Implementations§

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impl<'tcx> Clone for Constraint<'tcx>

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

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

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

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fn cmp(&self, other: &Constraint<'tcx>) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Selfwhere
Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · source§

fn min(self, other: Self) -> Selfwhere
Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · source§

fn clamp(self, min: Self, max: Self) -> Selfwhere
Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl<'tcx> PartialEq<Constraint<'tcx>> for Constraint<'tcx>

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fn eq(&self, other: &Constraint<'tcx>) -> bool

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'tcx> PartialOrd<Constraint<'tcx>> for Constraint<'tcx>

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fn partial_cmp(&self, other: &Constraint<'tcx>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · source§

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · source§

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<'tcx> Copy for Constraint<'tcx>

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impl<'tcx> Eq for Constraint<'tcx>

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impl<'tcx> StructuralEq for Constraint<'tcx>

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impl<'tcx> StructuralPartialEq for Constraint<'tcx>

Auto Trait Implementations§

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impl<'tcx> RefUnwindSafe for Constraint<'tcx>

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

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

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impl<'tcx> Unpin for Constraint<'tcx>

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impl<'tcx> UnwindSafe for Constraint<'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,

const: unstable · source§

fn borrow(&self) -> &T

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

const: unstable · source§

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

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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

const: unstable · source§

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.
const: unstable · source§

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.
const: unstable · source§

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:

  • VarSubVar: 8 bytes
  • RegSubVar: 12 bytes
  • VarSubReg: 12 bytes
  • RegSubReg: 20 bytes