Enum GenericArgument

#[non_exhaustive]
pub enum GenericArgument {
    Lifetime(Lifetime),
    Type(Type),
    Const(Expr),
    AssocType(AssocType),
    AssocConst(AssocConst),
    Constraint(Constraint),
}

Available on crate features full or derive only.

An individual generic argument, like 'a, T, or Item = T.

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(Lifetime)

A lifetime argument.

Type(Type)

A type argument.

Const(Expr)

A const expression. Must be inside of a block.

NOTE: Identity expressions are represented as Type arguments, as they are indistinguishable syntactically.

AssocType(AssocType)

A binding (equality constraint) on an associated type: the Item = u8 in Iterator<Item = u8>.

AssocConst(AssocConst)

An equality constraint on an associated constant: the PANIC = false in Trait<PANIC = false>.

Constraint(Constraint)

An associated type bound: Iterator<Item: Display>.

Trait Implementations

impl Clone for GenericArgument

Available on crate feature clone-impls only.

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 GenericArgument

Available on crate feature extra-traits only.

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

Formats the value using the given formatter.

impl Hash for GenericArgument

Available on crate feature extra-traits only.

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 GenericArgument

Available on crate feature parsing only.

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

impl PartialEq for GenericArgument

Available on crate feature extra-traits only.

fn eq(&self, other: &Self) -> 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 ToTokens for GenericArgument

Available on crate feature printing only.

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 GenericArgument

Available on crate feature extra-traits only.