Macro inline_default

macro_rules! inline_default {
    (
        $(
            $(#[$s_at:meta])* // attributes
            $s_v:vis struct $s_nm:ident //struct name, vis
            $(< $($s_lt:lifetime,)* $( $s_gen:ident $(: $s_tr:ident)? ),* $(,)? >)? // generics
            { $( $(#[$f_at:meta])* $f_v:vis $f_nm:ident : $f_ty:ty $(= $def:expr)? ),* $(,)? } // definition
        )*
    ) => { ... };
}

Derive Default within struct definition. See README for details.