Enum darling::usage::Purpose

pub enum Purpose {
    BoundImpl,
    Declare,
}

The goal of tracing generic parameter usage.

Not all uses of type parameters imply a need to add bounds to a generated trait impl. For example, a field of type <Vec<T> as a::b::Trait>::Associated does not need a where T: Serialize bound in serde. However, a proc macro that is attempting to generate a helper struct would need to know about this usage, or else the generated code would reference an unknown type T and fail to compile.

Variants

BoundImpl

The tracing is being used to generate an impl block.

Uses such as syn::TypePath.qself will not be returned.

Declare

The tracing is being used to generate a new struct or enum.

All uses will be returned.

Trait Implementations

impl Clone for Purpose

fn clone(&self) -> Purpose

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Purpose

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

Formats the value using the given formatter.

impl From<Purpose> for Options

fn from(purpose: Purpose) -> Options

Converts to this type from the input type.

impl PartialEq for Purpose

fn eq(&self, other: &Purpose) -> 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 Copy for Purpose

impl Eq for Purpose

impl StructuralPartialEq for Purpose