Enum Nullability 

pub enum Nullability<'src> {
    NonNull {
        syntax: Option<GraphQLToken<'src>>,
    },
    Nullable,
}

The nullability of a type reference.

Rather than modeling NonNullType as a recursive enum variant (which would allow redundant same-level wrapping like NonNull(NonNull(...))), nullability is flattened into this enum on each concrete type annotation node.

Multi-level NonNull (e.g. [String!]!) is fully supported: the inner String! is the list’s element_type (a separate TypeAnnotation with its own Nullability), and the outer ! is on the ListTypeAnnotation.

Variants

NonNull

Fields

syntax: Option<GraphQLToken<'src>>

The ! token. Present when syntax detail is retained.

Nullable

Trait Implementations

impl<'src> Clone for Nullability<'src>

fn clone(&self) -> Nullability<'src>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'src> Debug for Nullability<'src>

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

Formats the value using the given formatter.

impl<'src> PartialEq for Nullability<'src>

fn eq(&self, other: &Nullability<'src>) -> 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<'src> StructuralPartialEq for Nullability<'src>