Macro abortable_parser::either

macro_rules! either {
    ($i:expr, $f:ident!( $( $args:tt )* ), $( $rest:tt)* ) => { ... };
    ($i:expr, $f:ident, $($rest:tt)* ) => { ... };
    ($i:expr, $f:ident!( $( $args:tt )* )) => { ... };
    ($i:expr, $f:ident) => { ... };
    (__impl $i:expr, $f:ident) => { ... };
    (__impl $i:expr, $f:ident,) => { ... };
    (__impl $i:expr, $f:ident!( $( $args:tt )* ),) => { ... };
    (__impl $i:expr, $f:ident!( $( $args:tt )* )) => { ... };
    (__impl $i:expr, $f:ident!( $( $args:tt )* ), $( $rest:tt )* ) => { ... };
    (__impl $i:expr, $f:ident, $( $rest:tt )* ) => { ... };
}

Returns the output of the first sub parser to succeed.

use abortable_parser::iter;
let input_str = "foo";
let iter = iter::SliceIter::new(input_str.as_bytes());
let result = either!(iter, text_token!("bar"), text_token!("foo"));