Enum CustomTypeModifier 

pub enum CustomTypeModifier {
    Optional(UserType),
    Required(UserType),
}

A UserType that can be attached to any other type to add additional information to a type. A type with a CustomTypeModifier is considered not equal to the same type without a modifier.

The distinction between “optional” and “required” modifiers refers to how compilers and metadata tools treat them:

• An optional type modifier can be freely ignored when encountered by a compiler.
• A required type modifier should be treated specially by a compiler, as it indicates that the modified type has special semantics that cannot be ignored. See ECMA-335, II.7.1.1 (page 123) for more information.

Variants

Optional(UserType)

Required(UserType)

Trait Implementations

impl Clone for CustomTypeModifier

fn clone(&self) -> CustomTypeModifier

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CustomTypeModifier

impl Debug for CustomTypeModifier

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

Formats the value using the given formatter.

impl Eq for CustomTypeModifier

impl Hash for CustomTypeModifier

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 CustomTypeModifier

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

Equality operator ==.

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

Inequality operator !=.

impl ResolvedDebug for CustomTypeModifier

fn show(&self, res: &Resolution<'_>) -> String

Returns a display-oriented string using res as lookup context.

impl StructuralPartialEq for CustomTypeModifier