Macro winapi::ENUM

macro_rules! ENUM {
    {enum $name:ident { $($variant:ident = $value:expr,)+ }} => { ... };
    {enum $name:ident { $variant:ident = $value:expr, $($rest:tt)* }} => { ... };
    {enum $name:ident { $variant:ident, $($rest:tt)* }} => { ... };
    {@gen $name:ident $base:ident,} => { ... };
    {@gen $name:ident $base:ident, $variant:ident = $value:expr, $($rest:tt)*} => { ... };
    {@gen $name:ident $base:ident, $variant:ident, $($rest:tt)*} => { ... };
}