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Many macros could declare closures rather than just functions #19

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eternaleye opened this issue Mar 15, 2015 · 1 comment

eternaleye commented Mar 15, 2015

As a quick example, a rewritten alt!()

#[macro_export]
macro_rules! alt (
    ($name:ident<$i:ty,$o:ty>, $($rest:tt)*) => (
        fn $name(i:$i) -> IResult<$i,$o>{
            alt_parser!(i | $($rest)*)
        }
    );
    ($($rest:tt)*) => ( | i | { alt_parser!(i | $($rest)*) } );
);

Just one additional line, and now omitting the name allows it to be used in value position.

The text was updated successfully, but these errors were encountered:

Collaborator

Geal commented Mar 24, 2015

Since alt! now returns a block, this is no longer needed

Geal closed this as completed

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