dtolnay/syn 0.11.5 on GitHub

Implement an AST folder, syn::fold::Folder (#85, thanks @gnzlbg)

Expose parsers and parser combinators for parsing custom function-like macro input

extern crate syn;
#[macro_use] extern crate synom;

use syn::Expr;
use syn::parse::expr;

// An expression surrounded by [[ ... ]].
named!(double_bracket_expr -> Expr,
    delimited!(punct!("[["), expr, punct!("]]"))
);

fn main() {
    let input = "[[ 1 + 1 ]]";

    let parsed = double_bracket_expr(input).expect("double bracket expr");

    println!("{:?}", parsed);
}