Macro impl_mirrored

macro_rules! impl_mirrored {
    {
    type Mirror = $tinyname:ident;
    $(
        $(#[$attr:meta])*
        $v:vis fn $fname:ident ($seif:ident : $seifty:ty $(,$argname:ident : $argtype:ty)*) $(-> $ret:ty)? ;
    )*
    } => { ... };
}