Trait AttributeExt12 

pub trait AttributeExt12 {
    // Required method
    fn call_in_parens<T, F>(&self, f: F) -> Result<T>
       where F: FnOnce(ParseStream<'_>) -> Result<T>;

    // Provided method
    fn parse_in_parens<T: Parse>(&self) -> Result<T> { ... }
}

Helper trait to deal with syn’s idea of attribute contents

We expect all our attributes to be parenthesised.

Required Methods

fn call_in_parens<T, F>(&self, f: F) -> Result<T>

where F: FnOnce(ParseStream<'_>) -> Result<T>,

Like parse_in_parens, but takes a parser callback.

Provided Methods

fn parse_in_parens<T: Parse>(&self) -> Result<T>

Parse the content within an #[attribute(content)]

Parses the content as T.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl AttributeExt12 for Attribute

fn call_in_parens<T, F>(&self, f: F) -> Result<T>

where F: FnOnce(ParseStream<'_>) -> Result<T>,

Implementors