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<Purpose> for Purpose

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

impl Eq for Purpose

impl StructuralEq for Purpose

impl StructuralPartialEq for Purpose