Trait syntax::ext::base::TTMacroExpander

pub trait TTMacroExpander {
    fn expand<'cx>(
        &self, 
        ecx: &'cx mut ExtCtxt, 
        span: Span, 
        input: TokenStream
    ) -> Box<MacResult + 'cx>;
}

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Represents a thing that maps token trees to Macro Results

Required Methods

Important traits for Box<R>

impl<R> Read for Box<R> where
    R: Read + ?Sized, impl<W> Write for Box<W> where
    W: Write + ?Sized, impl<I> Iterator for Box<I> where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn expand<'cx>(
    &self,
    ecx: &'cx mut ExtCtxt,
    span: Span,
    input: TokenStream
) -> Box<MacResult + 'cx>

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

this crate is being loaded from the sysroot, an unstable location; did you mean to load this crate from crates.io via Cargo.toml instead?

Implementors

• impl<F> TTMacroExpander for F where
    F: for<'cx> Fn(&'cx mut ExtCtxt, Span, &[TokenTree]) -> Box<MacResult + 'cx>,