pub enum Purpose {
    BoundImpl,
    Declare,
}
Expand description

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

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Converts to this type from the input type.

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.