Enum WherePredicate

pub enum WherePredicate {
    BoundPredicate {
        type_: Type,
        bounds: Vec<GenericBound>,
        generic_params: Vec<GenericParamDef>,
    },
    LifetimePredicate {
        lifetime: String,
        outlives: Vec<String>,
    },
    EqPredicate {
        lhs: Type,
        rhs: Term,
    },
}

One where clause.

fn default<T>() -> T where T: Default { T::default() }
//                         ^^^^^^^^^^

Variants

BoundPredicate

A type is expected to comply with a set of bounds

Fields

type_: Type

The type that’s being constrained.

fn f<T>(x: T) where for<'a> &'a T: Iterator {}
//                              ^

bounds: Vec<GenericBound>

The set of bounds that constrain the type.

fn f<T>(x: T) where for<'a> &'a T: Iterator {}
//                                 ^^^^^^^^

generic_params: Vec<GenericParamDef>

Used for Higher-Rank Trait Bounds (HRTBs)

fn f<T>(x: T) where for<'a> &'a T: Iterator {}
//                  ^^^^^^^

LifetimePredicate

A lifetime is expected to outlive other lifetimes.

Fields

lifetime: String

The name of the lifetime.

outlives: Vec<String>

The lifetimes that must be encompassed by the lifetime.

EqPredicate

A type must exactly equal another type.

Fields

lhs: Type

The left side of the equation.

rhs: Term

The right side of the equation.

Trait Implementations

impl Clone for WherePredicate

fn clone(&self) -> WherePredicate

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for WherePredicate

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for WherePredicate

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for WherePredicate

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for WherePredicate

fn eq(&self, other: &WherePredicate) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for WherePredicate

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for WherePredicate

impl StructuralPartialEq for WherePredicate

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: 160 bytes

Size for each variant:

• BoundPredicate: 136 bytes
• LifetimePredicate: 56 bytes
• EqPredicate: 160 bytes