Macro std::backtrace_rs::windows::ffi

macro_rules! ffi {
    () => { ... };
    (#[repr($($r:tt)*)] pub struct $name:ident { $(pub $field:ident: $ty:ty,)* } $($rest:tt)*) => { ... };
    (@test_fields $a:ident $b:ident FltSave $ty:ty) => { ... };
    (@test_fields $a:ident $b:ident D $ty:ty) => { ... };
    (@test_fields $a:ident $b:ident s $ty:ty) => { ... };
    (@test_fields $a:ident $b:ident $field:ident $ty:ty) => { ... };
    (pub type $name:ident = $ty:ty; $($rest:tt)*) => { ... };
    (pub const $name:ident: $ty:ty = $val:expr; $($rest:tt)*) => { ... };
    ($(#[$meta:meta])* extern "system" { $(pub fn $name:ident($($args:tt)*) -> $ret:ty;)* } $($rest:tt)*) => { ... };
    (impl $name:ident { $($i:tt)* } $($rest:tt)*) => { ... };
}