Macro derive_ast_eq

macro_rules! derive_ast_eq {
    ($name:ident) => { ... };
    (($($index:tt $gen:tt),*)) => { ... };
    (struct $name:ident { $($field:ident),* $(,)? }) => { ... };
    (enum $name:ident {
        $($unit_variant:ident),* $(,)?
        _
        $($tuple_variant:ident ( $($(#[ast_eq_use($tuple_convert_func:ident)])? $tuple_field:ident),* $(,)? )),*  $(,)?
        _
        $($struct_variant:ident { $($(#[ast_eq_use($struct_convert_func:ident)])? $struct_field:ident),* $(,)? }),*  $(,)?
    }) => { ... };
}