Enum syn::WherePredicate

#[non_exhaustive]
pub enum WherePredicate {
    Lifetime(PredicateLifetime),
    Type(PredicateType),
}

A single predicate in a where clause: T: Deserialize<'de>.

Syntax tree enum

This type is a syntax tree enum.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Lifetime(PredicateLifetime)

A lifetime predicate in a where clause: 'a: 'b + 'c.

Type(PredicateType)

A type predicate in a where clause: for<'c> Foo<'c>: Trait<'c>.

Trait Implementations

impl Clone for WherePredicate

fn clone(&self) -> Self

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, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<PredicateLifetime> for WherePredicate

fn from(e: PredicateLifetime) -> WherePredicate

Converts to this type from the input type.

impl From<PredicateType> for WherePredicate

fn from(e: PredicateType) -> WherePredicate

Converts to this type from the input type.

impl Hash for WherePredicate

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

where H: Hasher,

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 Parse for WherePredicate

fn parse(input: ParseStream<'_>) -> Result<Self>

impl PartialEq for WherePredicate

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

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

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.

impl ToTokens for WherePredicate

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.

impl Eq for WherePredicate