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#[macro_export]
macro_rules! out {
    ($($tokens:tt)*) => { print!($($tokens)*) }
}
#[macro_export]
macro_rules! outln {
    ($($tokens:tt)*) => { println!($($tokens)*) }
}
#[macro_export]
macro_rules! errln {
    ($($tokens:tt)*) => { eprintln!($($tokens)*) }
}
#[macro_export]
macro_rules! row {
    ($( $key: expr => $val: expr ),*) => {{
         let mut map = ::indexmap::IndexMap::new();
         $( map.insert($key, $val); )*
         ::nu_protocol::UntaggedValue::row(map).into_untagged_value()
    }}
}